Dissertations / Theses: 'Dental radiographies'

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Barbieri, Ana Amélia [UNESP]. "Importância da radiografia panorâmica como instrumento auxiliar às práticas clínica e odontolegal." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/105862.

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Made available in DSpace on 2014-06-11T19:35:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-12-08Bitstream added on 2014-06-13T20:06:38Z : No. of bitstreams: 1 barbieri_aa_dr_sjc.pdf: 394148 bytes, checksum: 38068de89d952ac2c1ec034621729317 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) As radiografias odontológicas registram a situação clínica do indivíduo embasando o tratamento proposto e acompanhando sua evolução. Dentre elas a radiografia panorâmica propicia uma visão mais ampla do complexo bucomaxilofacial, permitindo a descoberta de processos patológicos e outros achados, contribuindo para diagnósticos mais eficazes e melhor planejamento terapêutico. Além disso, é igualmente relevante no processo de identificação humana,estimativa da idade e na solução de discussões judiciais. Este estudo foi conduzido visando fundamentar a necessidade da inclusão da radiografia panorâmica como documento imprescindível ao prontuário do paciente, de modo a conferir a ele maior autenticidade. Para tanto, foram avaliadas 2732 radiografias panorâmicas não identificadas, de pacientes na faixa etária de 15 a 55 anos, de ambos os sexos, procedentes dos acervos da Disciplina de Radiologia da FOSJC-UNESP e de uma clínica radiológica particular da cidade de São José dos Campos - SP. A análise das radiografias buscou achados radiográficos não observáveis clinicamente. Os dados encontrados foram submetidos a análise estatística descritiva, TesteT Student e Teoria Central do Limite. Do total das radiografias panorâmicas avaliadas, 20,31% apresentaram achados radiográficos. Não foram encontradas diferenças estatisticamente significantes entre os sexos e entre os sexos e a faixa etária. Os dados obtidos e a múltipla finalidade odontológica da radiografia panorâmica demonstram sua essencialidade como documento a complementar o prontuário odontológico do indivíduo, conferindo a ele maior legitimidade e valor clínico The dental radiographies make part of the documents that fill in the patients file, keeping the patients clinical situation registers before and during treatment, and after its conclusion, supporting the proposed treatment and following its evolution. From those radiographies used for dental purposes, the panoramic radiography is the one that gives you a wide vision of the bucomaxilar complex for embracing teeth, facial bones, and surround structures. It is equally relevant in the human identification process, age chronology, and in court for judicial issues. This study aims to reinforce the need to include the panoramic radiography to the patients file as an essential document, accrediting bigger authenticity to it. For this purpose, the authors evaluated 2732 no identified panoramic radiographies of male and female patients between 15 and 55 years of age gotten from the Radiology Subject of FOSJC-UNESP files and from a private radiological clinic in São José dos Campos - SP. This study investigated for radiographic finds not clinically seen. The data obtained was submitted to descriptive statistical analysis and Student T test. It was observed that 20,31% of all panoramic radiographies evaluated carried radiographic finds. No significantly statistical differences were found between the sexes and the sexes and ages. Obtained data and the multiple use of the panoramic radiography indicate its importance as a complementary document to the patients file, accrediting to it bigger legal and clinical values

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Barbieri, Ana Amélia. "Importância da radiografia panorâmica como instrumento auxiliar às práticas clínica e odontolegal /." São José dos Campos [s.n.], 2011. http://hdl.handle.net/11449/105862.

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Orientador: Mari Eli Leonelli Moraes Profa. Coorientador: Suely Carvalho Mutti Naressi Banca: Janete Dias Almeida Banca: Rogério Nogueira de Oliveira Banca: Milton Gonçalves Soares Banca: Sérgio Lúcio Pereira de Castro Lopes Resumo: As radiografias odontológicas registram a situação clínica do indivíduo embasando o tratamento proposto e acompanhando sua evolução. Dentre elas a radiografia panorâmica propicia uma visão mais ampla do complexo bucomaxilofacial, permitindo a descoberta de processos patológicos e outros achados, contribuindo para diagnósticos mais eficazes e melhor planejamento terapêutico. Além disso, é igualmente relevante no processo de identificação humana,estimativa da idade e na solução de discussões judiciais. Este estudo foi conduzido visando fundamentar a necessidade da inclusão da radiografia panorâmica como documento imprescindível ao prontuário do paciente, de modo a conferir a ele maior autenticidade. Para tanto, foram avaliadas 2732 radiografias panorâmicas não identificadas, de pacientes na faixa etária de 15 a 55 anos, de ambos os sexos, procedentes dos acervos da Disciplina de Radiologia da FOSJC-UNESP e de uma clínica radiológica particular da cidade de São José dos Campos - SP. A análise das radiografias buscou achados radiográficos não observáveis clinicamente. Os dados encontrados foram submetidos a análise estatística descritiva, TesteT Student e Teoria Central do Limite. Do total das radiografias panorâmicas avaliadas, 20,31% apresentaram achados radiográficos. Não foram encontradas diferenças estatisticamente significantes entre os sexos e entre os sexos e a faixa etária. Os dados obtidos e a múltipla finalidade odontológica da radiografia panorâmica demonstram sua essencialidade como documento a complementar o prontuário odontológico do indivíduo, conferindo a ele maior legitimidade e valor clínico Abstract:The dental radiographies make part of the documents that fill in the patients file, keeping the patients clinical situation registers before and during treatment, and after its conclusion, supporting the proposed treatment and following its evolution. From those radiographies used for dental purposes, the panoramic radiography is the one that gives you a wide vision of the bucomaxilar complex for embracing teeth, facial bones, and surround structures. It is equally relevant in the human identification process, age chronology, and in court for judicial issues. This study aims to reinforce the need to include the panoramic radiography to the patients file as an essential document, accrediting bigger authenticity to it. For this purpose, the authors evaluated 2732 no identified panoramic radiographies of male and female patients between 15 and 55 years of age gotten from the Radiology Subject of FOSJC-UNESP files and from a private radiological clinic in São José dos Campos - SP. This study investigated for radiographic finds not clinically seen. The data obtained was submitted to descriptive statistical analysis and Student T test. It was observed that 20,31% of all panoramic radiographies evaluated carried radiographic finds. No significantly statistical differences were found between the sexes and the sexes and ages. Obtained data and the multiple use of the panoramic radiography indicate its importance as a complementary document to the patients file, accrediting to it bigger legal and clinical values Doutor

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Manhães, Júnior Luiz Roberto Coutinho. "Correlação entre a maturação óssea das vértebras cervicais com a maturação óssea de mão e punho e com a mineralização dentária pelo método radiográfico /." São José dos Campos : [s.n.], 2006. http://hdl.handle.net/11449/105870.

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Orientador: Mari Eli Leonelli de Moraes Banca: João Carlos da Rocha Banca: João Batista Macedo Becker Banca: Frab Norberto Boscolo Banca: Francisco Haiter Neto Resumo: O objetivo nesta pesquisa foi a correlação da maturação óssea da segunda (C2), terceira (C3) e da quarta (C4) vértebras cervicais com as fases de maturação óssea de mão e punho e mineralização do segundo molar inferior. A amostra foi constituída de 252 prontuários nos quais continham radiografias cefalométricas laterais, de mão e punho e panorâmicas de 138 indivíduos do sexo feminino e 114 do masculino. A faixa etária ficou compreendida entre os cinco anos e zero mês a 16 anos e 11 meses. Os prontuários foram divididos apenas por sexo já que a associação entre os parâmetros ocorreu a partir da classificação do desenvolvimento das vértebras cervicais. As análises estatísticas foram realizadas separadamente para cada fator e sexo e unidas ao final para se obter a correlação da maturação óssea de mão e punho e mineralização dentária com as vértebras cervicais. Considerando a maturação óssea de mão e punho e mineralização dentária, não houve diferença na seqüência de aparecimento dos eventos se comparado os sexos, sendo notado um adiantamento dos indivíduos do sexo feminino em relação aos do masculino. Verificou-se que para o último estágio vertebral, os indivíduos do sexo feminino estavam no início do capeamento do osso rádio e com dois terços de raiz formada do segundo molar inferior, enquanto os do masculino apresentavam-se com a união total das falanges distais e com o ápice formado. Conclui-se que tanto os indivíduos do sexo feminino quanto os do masculino, apresentaram uma alta correlação entre os fatores. Abstract: The aim of this research was the correlation of the second (C2), third (C3) and fourth (C4) cervical vertebrae bone maturation with the phases of the hand-wrist bone maturation and dental mineralization of lower second molar. The sample was constituted of 252 childrens handbooks which had cefalometric, hand-wrist and panoramic radiographies of the 138 female and 114 male. The chronological age was between five years and zero month to 16 years and 11 months. The division of the handbooks is by sex however the association between the factors done in reference of the cervical vertebrae development classification. The statistical analyses were realized separately for each sex and factor and added in the finish to obtain the correlation of the hand-wrist bone maturation and dental mineralization with the cervical vertebrae. Considering the hand-wrist bone maturation and dental mineralization, there werent differences statistically significant in the sequence of the events if compare both sex, being noted that the female was earlier than the male. The last stage of cervical vertebrae was verified that the female was in the begin of the radio capping and two third of radicular formation of the second lower molar while the male showed with the total union of the distal phalange and complete radicular formation. The conclusions were that the both sex showed a high correlation between the factors. Doutor

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Manhães, Júnior Luiz Roberto Coutinho [UNESP]. "Correlação entre a maturação óssea das vértebras cervicais com a maturação óssea de mão e punho e com a mineralização dentária pelo método radiográfico." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/105870.

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Made available in DSpace on 2014-06-11T19:35:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-11-14Bitstream added on 2014-06-13T19:24:32Z : No. of bitstreams: 1 manhaesjunior_lrc_dr_sjc.pdf: 1726237 bytes, checksum: bccfdeb3ec45334f02e1626a80f32949 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) O objetivo nesta pesquisa foi a correlação da maturação óssea da segunda (C2), terceira (C3) e da quarta (C4) vértebras cervicais com as fases de maturação óssea de mão e punho e mineralização do segundo molar inferior. A amostra foi constituída de 252 prontuários nos quais continham radiografias cefalométricas laterais, de mão e punho e panorâmicas de 138 indivíduos do sexo feminino e 114 do masculino. A faixa etária ficou compreendida entre os cinco anos e zero mês a 16 anos e 11 meses. Os prontuários foram divididos apenas por sexo já que a associação entre os parâmetros ocorreu a partir da classificação do desenvolvimento das vértebras cervicais. As análises estatísticas foram realizadas separadamente para cada fator e sexo e unidas ao final para se obter a correlação da maturação óssea de mão e punho e mineralização dentária com as vértebras cervicais. Considerando a maturação óssea de mão e punho e mineralização dentária, não houve diferença na seqüência de aparecimento dos eventos se comparado os sexos, sendo notado um adiantamento dos indivíduos do sexo feminino em relação aos do masculino. Verificou-se que para o último estágio vertebral, os indivíduos do sexo feminino estavam no início do capeamento do osso rádio e com dois terços de raiz formada do segundo molar inferior, enquanto os do masculino apresentavam-se com a união total das falanges distais e com o ápice formado. Conclui-se que tanto os indivíduos do sexo feminino quanto os do masculino, apresentaram uma alta correlação entre os fatores. The aim of this research was the correlation of the second (C2), third (C3) and fourth (C4) cervical vertebrae bone maturation with the phases of the hand-wrist bone maturation and dental mineralization of lower second molar. The sample was constituted of 252 children s handbooks which had cefalometric, hand-wrist and panoramic radiographies of the 138 female and 114 male. The chronological age was between five years and zero month to 16 years and 11 months. The division of the handbooks is by sex however the association between the factors done in reference of the cervical vertebrae development classification. The statistical analyses were realized separately for each sex and factor and added in the finish to obtain the correlation of the hand-wrist bone maturation and dental mineralization with the cervical vertebrae. Considering the hand-wrist bone maturation and dental mineralization, there weren t differences statistically significant in the sequence of the events if compare both sex, being noted that the female was earlier than the male. The last stage of cervical vertebrae was verified that the female was in the begin of the radio capping and two third of radicular formation of the second lower molar while the male showed with the total union of the distal phalange and complete radicular formation. The conclusions were that the both sex showed a high correlation between the factors.

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Vermeulen, Lisa. "Development of a radiographic dental implant guide for forensic identification using current dental implants." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2755.

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Thesis (MSc (Radiography))--Cape Peninsula University of Technology, 2018. Introduction: Forensic dentistry plays a key role in identifying human remains that cannot be identified visually or by other means. Studies have shown that in cases of single or multiple deaths, scientific identification of human remains utilising forensic dentistry is often the most successful source of identification. Dental identification of human remains consists of a very complex procedure that makes it necessary during the investigation process to use and compare unique dental identifiers. A reliable and accurate method of identifying human remains is a positive radiological identification between ante-mortem and post-mortem images of dental radiographic images. Even if ante-mortem radiographic images may not be present during the identification process, post-mortem images may include details of dental restorations such as dental implants which cannot be seen during visual examination. The different types of dental implants vary in morphology and in conjunction with the unique appearance of dental anatomy and the placement of custom restorations such as dental implants, it has been found to accurately assist in the identification of human remains. Objectives: To establish a radiographic dental implant guide for ten commonly used dental implant types in the Western Cape, South Africa; and to identify and describe the morphological characteristics of these dental implant types as observed on pantomographs. Methods: The ten commonly used dental implant types were imaged radiographically to create a reference instrument which served as a tool for identifying and comparing different types of dental implants. The morphologies of the different dental implants, specifically the apex, thread and neck, were observed on ante-mortem pantomographs and compared to the appearance of the dental implants on the reference instrument to make a positive match. The straight tube image of all ten dental implant types in the reference instrument was used as the point of reference to positively identify the morphological characteristics of each dental implant type on the pantomographs. The morphological characteristics of the ten commonly used dental implant types used in the Western Cape were described and based on this a radiographic dental implant guide was developed. Results: A total of 384 dental implants were observed on the pantomographs. Of these, 380 dental implants could be positively identified on the pantomographs while 4 dental implants could not. A total of 350 dental implants (91%) were identified as dental implant types listed in the reference instrument while 30 dental implants were identified as a dental implant type not listed in the reference instrument. A total of 208 dental implants (54.2%) could be positively identified using the morphological characteristics namely the apex, thread and neck on the straight tube images of the dental implant type in the reference instrument. The radiographic dental implant guide was developed based on positive identification of the morphological characteristics of the dental implant types. Conclusion: This research study has illustrated that the morphology of dental implants can be used to differentiate between different dental implant types on pantomographs. Each dental implant type had unique morphological characteristics as well as similarities which enabled distinction between the different dental implant types, which facilitated dental implant identification and the development of a radiographic dental implant guide. The radiographic dental implant guide developed as part of this research study, may be useful in the field of forensic dentistry and forensic radiology.

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Sundén, Pikner Solweig. "Radiographic follow-up analysis of Brånemark® dental implants /." Göteborg : Department of Oral and Maxillofacial Radiology, Institute of Odontology, University of Gothenburg, Folktandvården, Postgraduate Dental Education Center, 2008. http://hdl.handle.net/2077/10124.

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Drangsholt, Mark Thomas. "Measurement of lifetime dental radiographic radiation exposure to the cranial meninges /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/10904.

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McBride, David Glynn. "Longitudinal assessment of age-related change in the dental pulp chamber and age estimation using dental radiographs." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4745.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2007. The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 28, 2007) Vita. Includes bibliographical references.

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Ekert, Thomas [Verfasser]. "Machine learning techniques for computer aided classification of dental radiographic images / Thomas Ekert." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2020. http://d-nb.info/1206183144/34.

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Soikkonen, K. (Kari). "Radiographic oral findings and death risk in the elderly." Doctoral thesis, University of Oulu, 1999. http://urn.fi/urn:isbn:9514254546.

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Abstract Radiographic oral and maxillofacial findings were recorded in a cohort of 293 home living elderly, in Helsinki, Finland, derived from a random sample of 8035 subjects, , born in 1904, 1909, and 1912, who participated in the Helsinki Ageing Study. They were 76, 81, and 86 years old at the commencement of the radiographic study. The relationships of potentially infectious findings with increased all-cause mortality over four years were studied. During the four-year follow-up, 18.5% of the subjects died. Of the 124 edentulous subjects, 17% had condylar findings, 13% radiopaque intraosseous findings, 9% retained roots, 6% maxillary sinus findings, 4% impacted teeth and 3% radiolucent findings. Edentulous women had more arthrotic condylar findings than men. The mean number of teeth in the 169 dentate subjects was 13.9, 15.5 in men and 13.2 in women. Carious teeth were found in 75%, radiolucent findings in 41%, teeth with vertical infrabony pockets in 51%, furcation lesions in 28%, calculus in 40%, and condylar findings in 25%. Periodontal attachment loss was slight in 18%, moderate in 31%, and advanced in 46%. 21% of the teeth had been endodontically treated. Periapical lesions were found in 17% of these teeth, and in 4% of the other teeth. 75% of the rootfillings were inadequate, exhibiting periapical lesions twice as often as the adequate ones. Men had more carious teeth, periapical lesions and furcation lesions than women, indicating better oral hygiene and/or utilisation of dental services in women. Compared with the previous studies carried out in Finland, slightly more teeth and less tooth-associated pathology were found in the present subjects. In contemporary Scandinavian studies, only a slightly better oral health status in the elderly has been reported. During the four-year follow-up, mortality was higher in the subjects with moderate to advanced infrabony pockets, OR 2.2, 1.0-4.7. In the previous studies, similar associations have been found in larger study cohorts including younger subjects. Our results indicate that oral foci may be more dangerous for the elderly than it has been previously thought, as the subjects who died had poorer dental health than those who survived.

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Elouafkaoui, Paula. "Variation in treatment : an analysis of dental radiographs using matched patient provider data." Thesis, University of Dundee, 2011. https://discovery.dundee.ac.uk/en/studentTheses/4349965c-22fe-46d1-ac9e-e6345a535781.

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Variation in health care, whether it be in terms of the utilisation of resources, observed health outcomes, costs, quality or access to health care is a well recognised and ever present feature of the modern day health care system. Health care variations challenge basic assumptions about the nature of the health care economy and raise questions about efficiency, equity and where best to direct policy instruments in health care markets. Despite the vast literature documenting variation, and the many discussions around ways to reduce variations in health care markets, the field of dental care has received little interest, in comparison to that of general medical care. This thesis will address this gap and will analyse the variation observed in a specific dental care treatment (dental radiographs) within NHS Scotland, with particular emphasis on the contribution of both dentist and patient unobserved heterogeneity. The thesis takes its focus from two strands of the literature; the underlying theoretical aspect draws on the literature concerning the theory of incentives and physician agency, whilst the empirical component makes use of recent advances in micro-econometric methods, documented in the labour economics literature. Although the thesis is predominantly an empirical analysis, the estimation strategy combines ideas from both the theoretical and empirical literature. A matched patient provider dataset from NHS Scotland is used to conduct an analysis of the variation in dental radiographs, in the presence of, and controlling for unobserved dentist and patient heterogeneity. The results indicate that the remuneration structure alone has little or no impact on the treatment decision to provide a radiograph. When a dentist changes from being on a fixed salary contract to being paid on a fee-for-service basis, they are in fact less likely to provide a radiograph. This result changes in the presence of insurance (identified as being when patients are exempt from the patient charge) and indicates that when the self employed dentist can identify the patient as being exempt, they are more likely to provide a radiograph. This result provides some support for the theory that in the presence of insurance, financial incentives do influence the treatment decision. A final result of the study highlights the importance of accounting for unobserved patient and provider heterogeneity, a factor that has had little attention in the healthcare literature. The results suggest that patient variation, as opposed to the variation across dentists, is much more important in explaining total variation. This is a similar result to that found in both the labour and education literatures.

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Schrader, Michelle. "Assessing the Diagnostic Value of Lateral Cephalometric Radiographs in Class I Dental Malocclusions." Master's thesis, Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/583754.

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Oral Biology M.S. Introduction: Controversy exists over the value of a lateral cephalogram for treatment planning in different malocclusion types. Discord has been found in the literature, and no studies on the matter have focused solely on Class I dental malocclusions. The aim of this study was to elucidate whether treatment decisions of extraction or non-extraction and the perceived need for a lateral cephalogram would change depending on whether a lateral cephalogram was provided or eliminated in the patient record set. Methods: A survey was distributed to a random sample of AAO members. The survey consisted of four different patient record sets, each with a Class I dental malocclusion. Each record set had two versions—one with the lateral cephalogram and one without. The survey had randomization of each version of the record sets so that each record set would be viewed an equal number of times with and without its corresponding cephalogram. Subjects were then asked a series of four questions pertaining to each case: was a cephalogram necessary for treatment planning, treatment of extraction versus non-extraction, retention method, and if records were adequate to treatment plan. Results: In total, 79 orthodontists completed the survey. For all cases combined, record sets viewed with the lateral cephalogram had an increase in the: perceived need for a lateral cephalogram, decision of extraction, and opinion of the records being adequate to treatment plan. All were statistically significant at P ≤ 0.001. For each record set, the difference in perceived need for a lateral cephalogram was statically significant. Conclusions: The use of a lateral cephalogram for diagnosing and treatment planning seems to hold value in Class I dental malocclusions, justifying radiation exposure for this diagnostic record. Additionally, the perceived need for a lateral cephalogram is greater when it is presented with the record sets, demonstrating the diagnostic value this radiograph holds. Temple University--Theses

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Brent, Barbara K. "A Survey of the Implementation and Usage of Electronic Dental Records and Digital Radiographs in Private Dental Practices in Mississippi." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etd/3365.

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Implementation of electronic health records by the Health Information Technology for Economic and Clinical Health has led to the implementation of electronic dental records (EDRs) and digital radiography in dental offices. The purpose of this study was to determine the state of the implementation and usage of EDRs and digital radiographs by the private general and pediatric dental practices in Mississippi as well as reasons why the dental practices are not moving forward with the advanced technology. A survey was emailed to 712 dental practices: 116 responded (16% response rate), and 104 consented to participate (89.66%). Results indicated dental practices in Mississippi using EDRs was 46.07%, EDRs with paper records was 42.70%, and only paper records was 11.24%. Results indicated dental practices using digital radiography was 76.40%, conventional radiography was 13.48%, and both was 10.11%. Common reasons for not advancing were cost, insufficient training, computer/software issues, and “too old.”

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Ma, Matthew P. "The radiographic assessment of dental implant treatments : a pilot study on two-implant supported overdenture cases /." Title page, contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09DM/09dmm111.pdf.

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McKenna, Catherine Josephine. "Accuracy in the comparison of trabecular bone patterns and other hard tissue features visible on digitised dental radiographs in forensic dental identification." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09SDN/09sdnm4788.pdf.

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Kallio-Pulkkinen, S. (Soili). "Effect of display type and room illuminance in viewing digital dental radiography:display performance in panoramic and intraoral radiography." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526209333.

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Abstract Today, digital imaging is widely used in dentistry. In medical radiography, the importance of displays and room illuminance has been shown in many studies, whereas the effect of these factors in the diagnosis of dental radiography is not clear and remains controversial. There is limited knowledge among dentists as to how observer performance is affected by the type of display, level of ambient light or grayscale calibration. The aim of this thesis was to compare observer performance in the detection of both anatomical structures and pathology in panoramic and bitewing radiographs using consumer grade display with γ 2.2- and DICOM-calibration, a tablet (3rd generation Apple iPad® and a 6 MegaPixel (MP) display under different lighting conditions. Furthermore, the thesis aimed at providing recommendations for type of display and acceptable illuminance levels in the room for interpretation of dental radiographs. Thirty panoramic and bitewing radiographs were randomly evaluated on four displays under bright (510 lx) and dim (16 lx) ambient lighting by two observers. Both anatomical structures and pathology were evaluated because they provided both low- and high-contrast structure. Consensus was considered as reference. Intra- and inter-observer agreement was determined. The proportion of equivalent ratings and weighted kappa were used to assess the reliability. The level of significance was set to P<0.05. DICOM calibration may improve observer performance in the detection of pathology in panoramic radiographs regardless of the room illuminance level. DICOM calibration improves the detection of enamel and dentinal caries in bitewing radiographs, particularly in bright lighting conditions. On the other hand, in dental practice the room illuminance level is often higher, and it is thus recommended that the overall lighting level should be decreased. Furthermore, a DICOM-calibrated consumer grade display can be used instead of a medical display in dental practice without compromising the diagnostic quality and it saves costs. Tablet displays are recommended to use with care in dental radiography Tiivistelmä Hammaslääketieteessä käytetään nykyään pääasiassa digitaalista kuvantamista. Lääketieteellisessä radiologiassa näyttöjen ja käyttöympäristön valaistuksen merkitys kuvien katseluun on osoitettu lukuisissa tutkimuksissa, kun taas hammaslääketieteellisten tutkimusten tulokset näiden tekijöiden vaikutuksista röntgenkuvien tulkintaan eivät ole yksiselitteisiä ja niissä on ristiriitaisuutta. Hammaslääkäreiden tiedot näyttöjen, kalibroinnin ja ympäröivän valaistuksen vaikutuksesta röntgenkuvan tulkintaan ovat puutteellisia. Tämän väitöskirjan tarkoituksena oli vertailla näyttöjen suorituskykyä panoraama- ja purusiivekekuvien tulkinnassa eri valaistusolosuhteissa. Tutkimuksessa vertailtiin γ 2.2- ja DICOM-kalibroitua perusnäyttöä, tablettia (kolmannen polven Apple iPad®) sekä 6 MegaPikselin (MP) lääketieteelliseen käyttöön tarkoitettua näyttöä. Lisäksi väitöskirjan tarkoituksena oli antaa hammaslääketieteellisten röntgenkuvien katseluun soveltuvia näyttöjä ja käyttöympäristön valaistusta koskevia suosituksia. Kaksi tulkitsijaa arvioi 30 panoraama- ja purusiivekeröntgenkuvaa satunnaisessa järjestyksessä neljältä eri näytöltä kirkkaassa (510 luksia) ja hämärässä (16 luksia) valaistuksessa. Tutkimuksessa arvioitiin sekä korkeakontrastisia anatomisia rakenteita että matalakontrastisia patologisia löydöksiä. Tuloksia verrattiin tutkijoiden väliseen yhteisluentaan. Luotettavuuden arviointiin käytettiin yhdenmukaisuusosuutta sekä painotettua kappaa. Toistettavuuden arvioimiseksi laskettiin kapat toisen alkuperäisten ja uusintaluentojen sekä molempien tulkitsijoiden alkuperäisluentojen välille. Merkitsevyystasoksi määriteltiin p<0,05. DICOM-kalibrointi voi parantaa patologisten löydösten tulkintaa panoraamakuvissa molemmissa valaistusolosuhteissa. DICOM-kalibrointi parantaa selvästi purusiivekekuvien hammaskiille- ja hammasluukarieksen tulkintaa erityisesti kirkkaassa valaistuksessa. Hammaslääkäreiden työskentelytilojen valaistus on yleensä korkeampi kuin tutkimuksessa käytetty, joten näyttöjen käyttöympäristön valaistusta tulisi laskea toimistovalaistusta vastaavaksi. DICOM-kalibroitua perusnäyttöä voidaan suositella käytettäväksi kalliiden medikaalinäyttöjen sijaan. Tablettia tulee sen sijaan käyttää harkiten hammaskuvien tulkintaan

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Li, Gang. "Visual linearization of image data for the display of digital intraoral radiographs." Stockholm, 2004. http://diss.kib.ki.se/2003/91-85910-36-8.

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Uys, Andre. "A pilot study to assess dental age estimation in black South African children using Demirjian's method." Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/27740.

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The age estimation method as described by Demirjian is the most frequently used tool to estimate the sub-adult dental age in forensic dentistry. This technique has been shown to over or under estimate the chronological age of sub-adults when applied to specific population groups. The aim of this study was to compare a black South African population sample with the original French-Canadian model to determine if Demirjian’s method accurately reflects the true chronological age of this population group. A sample of panoramic radiographs from 279 boys and 325 girls between the ages of 6 and 16 was obtained from the School of Dentistry University of Pretoria, and from orthodontists in private practice in the Pretoria region. The panoramic radiographs were used to score the seven left mandibular teeth. The calculated maturity score was used to determine the Demirjian dental age. All panoramic radiographs were scored by one examiner. A subset of 20 panoramic radiographs was scored by a second examiner and reliability tested using a Wilcoxon Matched Pairs Test. This research showed that black South African children have a more advanced dental age compared to French-Canadian children. Demirjian overestimated the age for boys by 0.8 years and for girls by 0.5 years. The dental age assessment provided by Demirjian is not suitable for black South African children. As a result, new standards of dental age assessment should be established for this population. Copyright Dissertation (MSc(Odont))--University of Pretoria, 2011. Oral Pathology and Oral Biology unrestricted

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Kased, Azad, and Peter Quach. "A Questionnaire Study on Patient Knowledge on X-ray Radiation Effects on Human Health from Dental Radiographic Examination." Thesis, Umeå universitet, Institutionen för odontologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-143417.

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Swedish Radiation Safety Authority has suggested guide-lines regarding information to individuals who undergo radiographic examinations. The guide-lines concerns medical care but patients in dental care can also be expected to have a wish to be informed about ionizing radiation. The main objective was to find out the patient’s perception of their knowledge about x-ray radiation and if they have a need to know more about x-rays. A questionnaire study was performed at two public dental clinics in Sweden during a twomonth period in the summer 2016. Patients ≥ 18 years old who gave their consent to participate were included in the study. Of all 429 participants 44 % declared an average knowledge about x-ray radiation and 37 % of all participants declared an inadequate knowledge. A total of 54 % had been informed about x-ray and its effects. School was the most common information source. Approximately 76 % had the perception that dental x-ray radiation is not harmful. 51 % declared the need to know more about x-ray. Approximately 52 % declared no knowledge about natural background radiation and 59 % declared it valuable to know more about dental x-ray in relation to natural background radiation. The participants showed mixed opinion and perception about x-ray radiation. A majority of patients want to know more about x-ray radiation. The study did not identify any particular group(s) needing more information about x-ray radiation than what is included in the justification of the radiographic examination.

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Ley, Paul J. "An in-vitro comparison of working length determination between a digital system and conventional film when source-film/sensor distance and exposure time are modified." Connect to resource online, 2009. http://hdl.handle.net/1805/1928.

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Thesis (M.S.D.)--Indiana University School of Dentistry, 2009. Title from PDF t.p. (viewed Aug. 11, 2009) Advisors: Mychel Vail, Chair of the Research Committee, Susan Zunt, Ted Parks, Kenneth Sponik, Joseph Legan. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 103-119).

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Christensen, Shane R. "An in vitro comparison of working length accuracy between a digital system and conventional film when vertical angulation of the object is variable." Connect to resource online, 2009. http://hdl.handle.net/1805/1926.

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Thesis (M.S.D.)--Indiana University School of Dentistry, 2009. Title from PDF t. p. (viewed Aug. 21, 2009) Advisor(s): Mychel Vail, Acting Chair of the Research Committee, Joseph Legan, Kenneth Spolnik, Susan L. Zunt, Edwin Parks. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 109-120).

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Abofatira, Mohamed Farag. "A radiographic analysis of the anterior palate as a donor site for bone harvesting." University of the Western Cape, 2015. http://hdl.handle.net/11394/5040.

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Magister Scientiae Dentium - MSc(Dent) Autologous bone grafting in conjunction with dental implant therapy is a well-accepted procedure in oral and maxillofacial rehabilitation. A variety of intraoral donor sites, such as the mandibular symphysis, the mandibular ramus and the maxillary tuberosity have been used in oral and maxillofacial reconstruction. However these sites are associated with complications. In order to reduce these complications, the anterior palate has been proposed as a potential donor site. However, the scientific literature in this regard is sparse, and larger studies are required to investigate the clinical potential of this proposed site. Aim: To determine the volume and density of available bone in the anterior palate that may be used for bone harvesting using cone-beam computed tomography (CBCT) in a select South African population. Materials and methods: One hundred previously acquired CBCT scans taken at the Diagnostic and Radiology Department of Tygerberg Oral Health Centre were analyzed for the required data. These were all acquired from a single CBCT machine (Newtom VGI®, Verona, Italy). The study sample included 52 females and 48 males ranging from ages 20 years to 80 years. The CBCT scans were divided into 3 different age groups. The first age group was between the ages of 20 and 39 years, the second age group was from 40 to 59 years and the third age group was ≥ 60 years. The volume and density of the anterior palate of the different age groups were analyzed using specific criterion. CBCT specific software (Simplant Pro Crystal®) Dentsply implants, Mannheim, Germany was used to standardize the data collection. All data was stored in a Microsoft Excel spreadsheet (Microsoft Corporation, Washington, USA). Results: The mean volume of the anterior palate in this study was 2.11 ± 0.55 cm3, with a minimum volume of 1.04 cm3 and a maximum volume of 3.82 cm3. There was no significant difference in the volume and density of the anterior palate between different age groups and no significant difference in the volume between males and females (p value = 0.227). Conclusions: The anterior palate affords a considerable amount of bone volume which is similar or even more than other intraoral donor sites. The anterior palate is a potential donor site for bone harvesting and CBCT may be regarded as an ideal tool to analyze the amount of bone available for harvesting.

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Hazey, Michael A. "Sensitivity comparison evaluation of computer-generated three dimensional surface topography to conventional maxillofacial radiographic imagery." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4481.

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Thesis (M.S.)--West Virginia University, 2006. Title from document title page. Document formatted into pages; contains x, 220 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 69-74).

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Alenazi, Khaled. "Comparison between the alpha angle of the maxillary impacted canines on panoramic radiographs and cone beam computed tomography." University of the Western Cape, 2019. http://hdl.handle.net/11394/7069.

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Magister Chirurgiae Dentium (MChD) There is a paucity of studies that make use of the alpha angle as a diagnostic tool to assist with the interceptive treatment, prognosis, treatment duration and surgical outcome of possible maxillary canine impaction in orthodontics. While the literature is replete with studies that utilise the sector method, the alpha angle is an alternative approach to assess the possible eruptive outcome of the unerupted canine. It has been reported that if the alpha angle is greater than 25°, there is the possibility of external root resorption. However, if the alpha angle is more than 31°, the prospect of canine eruption decreases even if the deciduous canine is extracted as an interceptive measure. The dental pantomograph has historically been used to predict canine eruption or possible impaction. The use of this method, however, is wrought with limitations. These limitations include magnification, distortion and blurred images. The use of cone-beam computed tomography has been advocated as a means to overcome these limitations.

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Haikola, B. (Britta). "Oral health among Finns aged 60 years and older:edentulousness, fixed prostheses, dental infections detected from radiographs and their associating factors." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526206141.

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Abstract Oral health among older people is shown to be worse compared to younger people. The aim of this study was to evaluate oral health and associating factors among ageing Finns. A cross-sectional, descriptive epidemiologic survey was performed in Kirkkonummi in southern Finland and in the Lakeus District in northern Finland. Altogether 1,191 subjects aged 60 to 78 years, 625 from Kirkkonummi and 566 from Lakeus, were examined and interviewed. Edentulousness and poor occlusal stability were recorded clinically. Gonial angle, ramus height, condylar height and the amount of residual ridge resorption in the mandible and the presence of fixed prostheses were evaluated from panoramic radiographs. Based on the radiographs the scoring of infection foci was performed with an infection focus index. The signs of infection recorded were deep caries, periapical lesions, furcal lesions, vertical bone pockets and horizontal bone loss. The prevalence of edentulousness was 37%, being significantly higher among women than among men and significantly higher in the northern compared to the southern region. Edentulousness was more prevalent among subjects with primary school education than among those with higher education. The mean of the gonial angle was smaller among dentate subjects than among edentulous ones. Dentate subjects had significantly greater ramus height and condylar height than edentulous subjects. Women had significantly more often than men severe residual ridge resorption in the mandible. Poor satisfaction with dentures associated significantly with poor occlusal stability in both genders. More than three quarters of the subjects had severe risk of infection, more in the southern than in the northern region. In the dentate sample women showed higher prevalence of fixed prostheses than men. In the Kirkkonummi region both men and women had more fixed prostheses than subjects in the Lakeus region. Edentulousness was very frequent among ageing Finns. Mandibular bone morphology changed as a consequence of tooth loss. The prevalence of fixed prostheses was low and the prevalence of signs of infection of dental origin was high. The geographical differences in oral health should be considered by health authorities in order to promote good oral health in rural areas, especially focusing on older people with low socio-economical status and poor health Tiivistelmä Vanhusväestön suun terveydentila on useassa tutkimuksessa todettu huonommaksi kuin nuoremmilla. Tämän tutkimuksen tarkoituksena oli selvittää suomalaisen ikääntyvän väestön suun terveydentilaa ja siihen liittyviä tekijöitä. Epidemiologinen poikkileikkaustutkimus tehtiin Kirkkonummella Etelä-Suomessa ja Lakeuden terveyskeskuksen alueella Pohjois-Suomessa. Tutkimukseen ja haastatteluun osallistui yhteensä 1191 iältään 60–78-vuotiasta henkilöä, 625 Kirkkonummelta ja 566 Lakeudelta. Kliinisessä tutkimuksessa selvitettiin hampaattomuus ja proteesien purentatasapaino. Alaleuan leukakulma, nousevan haaran ja nivellisäkkeen korkeus, hammasharjanteen korkeus ja kiinteiden proteesien esiintyminen arvioitiin panoraamaröntgenkuvista. Tulehdusriskiä kuvaava indeksi arvioitiin röntgenkuvien tulehdusmuutoksista, joina rekisteröitiin syvä karies, hampaan juurenpään tulehdus, tulehdus takahampaiden juurten haarautumassa, syventyneet luutaskut ja kiinnityskudoskato usean hampaan alueella. Hampaattomuuden vallitsevuus oli 37 %. Se oli tilastollisesti merkitsevästi korkeampi naisilla kuin miehillä ja pohjoisella alueella merkitsevästi korkeampi kuin eteläisellä. Hampaattomuus oli yleisempää vähiten koulutusta saaneilla kuin korkeamman koulutuksen saaneilla. Hampaallisilla oli pienempi alaleuan leukakulma kuin hampaattomilla, ja heillä oli myös korkeampi nouseva haara ja nivellisäke kuin hampaattomilla. Naisilla oli merkitsevästi useammin vakavaa hammasharjanteen madaltumista kuin miehillä. Molemmilla sukupuolilla tyytymättömyys proteeseihin liittyi merkitsevästi huonoon purentatasapainoon. Yli kolmella neljäsosalla tutkituista oli vakava tulehdusriski, eteläisellä alueella enemmän kuin pohjoisella. Hampaallisessa aineistossa naisilla oli enemmän kiinteitä proteeseja kuin miehillä. Kirkkonummen alueella tutkituilla oli enemmän kiinteitä proteeseja kuin Lakeuden alueella. Hampaattomuus oli hyvin yleistä 60–78-vuotiailla suomalaisilla. Alaleuanluun muoto muuttui hampaiden menetyksen seurauksena. Kiinteiden proteesien määrä oli vähäinen ja ikääntyvillä suomalaisilla oli röntgenkuvissa runsaasti hammasperäisten tulehdusten löydöksiä. Suun terveyden alueelliset erot tulisi ottaa huomioon suu- ja hammasterveyden edistämistyössä, jossa erityisesti tulisi huomioida alhaisen sosioekonomisen aseman ja huonon terveyden omaava vanhempi väestö

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Giovanini, Ellen Greves [UNESP]. "Análise densitométrica digital do processo de reparo em dentes de rato reimplantados." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/91434.

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Made available in DSpace on 2014-06-11T19:25:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-11-30Bitstream added on 2014-06-13T20:13:38Z : No. of bitstreams: 1 giovanini_eg_me_araca.pdf: 1544057 bytes, checksum: 1b518f21ba8bc63249a3f29eb78ba402 (MD5) A avulsão dentária é caracterizada pelo completo deslocamento do dente do seu alvéolo e a melhor forma de tratar um dente avulsionado é o seu reimplante. Mesmo diante das melhores circunstâncias os reimplantes tardios falham devido à reabsorção radicular que é detectada apenas durante a avaliação radiográfica. A imagem digital surgiu como um recurso diagnóstico rápido e de fácil utilização sendo considerada precisa. Para diminuir a variabilidade de interpretação é sugerida a análise radiográfica quantitativa por meio da densidade radiográfica. O propósito deste trabalho foi analisar comparativamente o processo de reparo do reimplante dental em ratos utilizando a análise densitométrica no sistema digital Digora. Foram utilizados 30 ratos machos, divididos em 3 grupos de 10 animais, que tiveram seu incisivo superior direito extraído e tratado da seguinte forma: grupo I - reimplante imediato, grupo II - reimplante tardio sem tratamento e o grupo III - reimplante tardio com tratamento da superfície radicular utilizando raspagem do ligamento e fluoreto de sódio. Os animais foram sacrificados após 60 dias do ato operatório, suas maxilas foram separadas e as imagens radiográficas obtidas de forma que sobre cada placa óptica ficassem as duas hemimaxilas (tratada e controle), o penetrômetro de alumínio e a identificação. Foram realizadas medidas de densidade em áreas padronizadas no sistema Digora. Os valores densitométricos encontrados foram submetidos à análise de variância e teste de Tuckey, e análise não paramétrica do número de áreas de reabsorção. Podemos concluir que a análise densitométrica constitui um importante exame complementar para o acompanhamento dos reimplantes uma vez que permitiu a detecção de reabsorção radicular em todos os grupos, cuja ordem decrescente de envolvimento foi o grupo do reimplante tardio sem tratamento... The dental replanted has been considered the best treatment of the tooth avulsion, which is characterized by complete alveolar dislodgment of the tooth. Despite of the adequate clinical situations, the delayed replantation fails due to the root resorption that is detected during the radiographic evaluation. The use of the digital image represent a fast and easy diagnostic resource, furthest more precise. The quantitative radiographic analysis has been suggested to reduce the interpretation variability through the radiographic density. The purpose of this work was to analyze the process of repair of the dental replanted using the digital densitometry in the Digora system. The 30 male rats were divided in 3 groups of 10 animals, and their right superior incisor were extracted and treated agreement with their group: group I - immediate replanted, group II - delayed replanted without treatment and the group III - delayed replanted with treatment of the root surface using fluoride of sodium. The animals were sacrificed after 60 days operative act, your jawbones were separate and the radiographic images obtained so that on each optical plate were the two jawbones (treated and control), the aluminum step wedge and the identification. The radiographic density of radicular standardized area in Digora system was measured. The densitometric values were submitted to the variance analysis and test of Tuckey and analysis non parametric of the number of areas root resoption. We can end that digital densitometry analysis it an important complementary for replanted evaluation once it allowed the detection of root reabsorption in all of the groups, whose decreasing order of involvement was the group of the delayed replanted without treatment, following for the delayed replanted with treatment and last the immediate replanted.

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Johan, Lenita Rebecca. "Maxillary Canine Ectopia and other Developmental Anomalies on Mixed Dentition Panoramic Radiographs at the Tygerberg Oral Health Centre." Thesis, University of the Western Cape, 2017. http://hdl.handle.net/11394/6192.

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Magister Scientiae Dentium - MSc(Dent) (Community Oral Health) The aim of this study was to establish whether there is any association between developing maxillary canine ectopia and various other dental anomalies using panoramic radiographs in the mixed dentition stage of development.

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28

Holm, Kvist Loka, and Stella Sabo. "How old are you? Age assessments based on dental radiographs of third molars around the 18-year-threshold in different populations, a systematic review." Thesis, Malmö högskola, Odontologiska fakulteten (OD), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19964.

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SammanfattningMineralisering och utveckling av visdomständer kan användas som åldersindikator i övre tonåren och används för asylsökande utan identifikation eller födelseattest. Utvärderingen görs med hjälp av dentala röntgenbilder och olika tolkningsmodeller.Målet med den aktuella studien var att undersöka åldersbedömningsmetoder på röntgenbilder av visdomständers tillförlitlighet och överensstämmelse med fokus på populationsgrupper och etnicitet. Detta är av vikt då resultat från en sådan bedömning ligger till grund för juridiska beslut huruvida en individ är vuxen eller ett barn (över eller under 18 år).En systematisk sökning genomfördes i PubMed, Embase och Cochrane enligt PRISMA-modellen, och 23 artiklar som uppfyllde inklusionskriterierna granskades av två observatörer enligt en modifierad QUADAS 2 och tio artiklar bedömdes ha låg risk för bias.Populationsbeskrivningarna var bristande. Detta leder till svårigheter att utföra bedömningar av artiklars resultat och precision, därmed också jämförelser mellan olika studier. Problemet ligger på en generell nivå då definitioner är osäkra, men samtidigt i de separata artiklarna då de inte redovisat någon definition.Det var svårt att jämföra de inkluderade artiklarna då deras syften och metoder varierade. Huvudfyndet var att de flesta artiklarna konkluderade att användningen av visdomstanden som en åldersindikator i de övre tonåren är en otillräcklig metod. Användning och betydelse av dess resultat bör därför ifrågasättas. AbstractThe mineralization and development of the third molars can be used as an indicator of age in the upper teens and is used in purpose of assessing age in asylum seekers without identification or birth certificates. The evaluation is determined with dental radiographs and different methods of interpretation.The aim of the study was to investigate the accuracy and precision of different age estimation models of radiographs of third molars, focusing on population groups and ethnicity. This is of great importance since the results of an age assessment constitute the basis in a juridical outcome, deciding whether an individual is an adult or a child (over or under 18 years of age). A systematic search of PubMed, Embase and Cochrane was made according to the PRISMA-statement, and 23 articles which met the inclusion criteria were assessed using a modified QUADAS 2 by two observers, ten of these were graded as having low risk of bias.Population groups were poorly described, leading to difficulties in evaluating results and precision, thereby also comparisons between different studies. The problem both lay at a general level where definitions are ambivalent, but also in the separate articles where definitions are missing.It was hard to compare the included papers since their aims and methods varied. The main finding was that most of the articles concluded that the use of the third molar as an age indicator in the upper teens is an insufficient system. The use and impact of the results should thereby be questioned.

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Meihls, Matthieu L. "Age Determination of Domesticated Dogs Using Pulp Chamber to Tooth Width Ratio." Ohio Dominican University Honors Theses / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=oduhonors1527101515092155.

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Faria, Paulo José de Vasconcelos. ""Prevalência das anomalias dentárias obsevadas em crianças de 5 a 12 anos de idade no Município de Belém - um estudo radiográfico"." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/23/23138/tde-22102003-092445/.

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RESUMO Os índices de prevalência das anomalias dentárias, sua distribuição por sexo, idade, arcada e lado têm variado de um autor para outro, e também, de acordo com a população pesquisada. Esta pesquisa foi desenvolvida no município de Belém, onde foram avaliadas 500 radiografias panorâmicas, de crianças de ambos os sexos, com a finalidade de se identificar a ocorrência das seguintes anomalias : Anodontia, Taurodontia, Dentes não irrompidos, Microdontia, Macrodontia, Dentes supranumerários e Geminação. Foi objetivo desta pesquisa, a partir das radiografias analisadas, buscar a caracterização das crianças avaliadas, possibilitando o diagnóstico, o mais precoce possível, facilitando as soluções terapêuticas. A análise dos resultados aferidos permite inferir que a amostra pesquisada apresenta traços característicos. Foram analisadas 500 radiografias panorâmicas, de 240 crianças do sexo masculino e 260 crianças do sexo feminino, sendo encontrados 118 casos de anomalias, perfazendo um prevalência de 16%.De acordo com as anomalias pesquisadas encontrou - se as seguintes prevalências: Anodontia (5,4%), Taurodontia (1,0%), Dentes não irrompidos (4,2%), Microdontia (2,0%), Macrodontia (0,6%), Dentes supranumerários (2,4%) e Geminação (0,4%). SUMMARY The rates of Dental prevalence of anomalies, its distribution per sex, age, arcade e side varies from author to author, and also according to the researched population. For this research was developed in the city of Belém where, 500 panoramic radiographies of children of both sexes were inspected in order to identify the happening of the following anomalies : Anodontia, Taurodontia, Unbroken out teeth, Microdontia, Macrodontia,Supernumerary teeth, Gemination. The purpose of this research, after the study of the radiographies, was to develop the haracterization of the appraised children in order to determine the therapeutic solutions.The analysis of the gauged results allows the conclusion that the researched sample presents characteristic features.There were found 118 cases of anomalies, completing a prevalence of 16%. According to the anomalies researched there were found the following prevalence rates : Anodontia ( 5,4% ), Taurodontia ( 1,0% ), Unbroken out teeth ( 4,2% ), Microdontia ( 2,0% ), Macrodontia ( 0,6% ) and Gemination ( 0,4% ).

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Vaz, Sergio Lins de Azevedo 1984. "Detection of periimplant fenestration and dehiscence using CBCT - an in vitro study = Diagnóstico tomográfico de fenestração e deiscência peri-implantar - estudo in vitro." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289080.

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Orientador: Francisco Haiter Neto Tese (Doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba Made available in DSpace on 2018-08-22T00:06:43Z (GMT). No. of bitstreams: 1 Vaz_SergioLinsdeAzevedo_D.pdf: 2097588 bytes, checksum: 48e378674d749eb9b8ea2a05042e21a4 (MD5) Previous issue date: 2013 Resumo: O presente estudo se propôs a avaliar a influência do tamanho de voxel e giro de escaneamento na detecção tomográfica de fenestração e deiscência peri-implantar, além do uso de filtros de imagem na detecção da deiscência peri-implantar. Em fragmentos de costelas bovinas, foi criado defeitos que simulariam fenestração e deiscência peri-implantar após a instalação de 100 implantes de titânio. As imagens foram adquiridas no tomógrafo computadorizado de feixe cônico i-CAT Next Generation, empregando FOV de 8 x 8 cm e três protocolos: A- voxel de 0,2 mm, giro de escaneamento de 180°; B- voxel de 0,2 mm, giro de 360°; C- voxel de 0,12 mm, giro de 360°. Cinco filtros do programa XoranCat foram testados: Angio Sharpen High 5x5, Shadow, Sharpen 3×3, Sharpen Mild e Smooth. Três cirurgiões-dentistas radiologistas identificaram a presença ou ausência dos defeitos. Curvas ROC foram criadas e os valores de área sob a curva (Az) comparados utilizando a Análise de Variância (ANOVA), com teste post hoc de Bonferroni (alfa de 5%). O teste de McNemar foi utilizado para comparar imagens (originais e com filtros) versus padrão ouro, bem como imagens originais versus imagens com filtros. Os resultados mostraram diferenças estatisticamente significantes entre os valores de Az dos protocolos B e C em relação ao protocolo A (p < 0,01) para deiscência. Houve diferenças estatisticamente significantes (p < 0,01) entre as imagens originais e o filtro Shadow em relação ao padrão ouro, bem como entre todos os filtros testados em relação às imagens originais. Concluiu-se que os tamanhos de voxel testados não influenciaram no diagnóstico de ambos os defeitos, enquanto que o giro de escaneamento completo (360°) foi melhor para deiscência. Diante da maior dificuldade no diagnóstico tomográfico de deiscência peri-implantar, o uso dos filtros de imagem testados é aconselhado, com exceção do filtro Shadow Abstract: This study set out an assessment of the effects of two voxel sizes and scan modes of cone-beam computed tomography (CBCT) in periimplant fenestration and dehiscence detection. It also aimed to investigate whether CBCT filters would enhance the diagnosis of periimplant dehiscence. One hundred titanium implants were placed in bovine ribs in which periimplant fenestration and dehiscence were simulated. The images were acquired using the i-CAT Next Generation CBCT unit, with a FOV of 8 x 8 cm and the following protocols: A- 0.2 mm voxel size half-scan (180°); B- 0.2 mm voxel size full-scan (360°); and C- 0.12 mm voxel size full-scan (360°). Five filters of the XoranCat software were tested: Angio Sharpen High 5x5, Shadow, Sharpen 3×3, Sharpen Mild and Smooth. Three oral radiologists performed a dynamic evaluation of the presence/absence of the defects and ROC curves were created. The values of the area under the curve (Az) were compared with ANOVA and Bonferroni post-hoc test. The significance level was adopted at 5%. The McNemar test was applied to perform two comparisons in order to identify disagreements. All the enhanced and the original images were compared with the gold-standard and the original images were compared to the enhanced ones. The protocol A had significantly lower Az values than those obtained with the protocols B and C (p < 0.01) for dehiscence. The original images and the Shadow filter were statistically different from the gold-standard (p < 0.01). All the enhanced images also had statistically significant differences from the original images (p < 0.01). In conclusion, the voxel sizes did not influence in periimplant fenestration and dehiscence detection but the full-scan (360°) performed better than the half-scan for dehiscence. The use of enhancement CBCT filters for dehiscence detection is advised, with the exception of the Shadow filter Doutorado Radiologia Odontologica Doutor em Radiologia Odontológica

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Jabour, Anwar Shawqi Alhazmi. "ASSESSMENT OF SPHENO-OCCIPITAL SYNCHONDROSIS FUSION TIMING AND AN EVALUATION OF ITS RELATIONSHIP WITH SKELETAL MATURITY, DENTAL MATURITY AND MANDIBULAR GROWTH." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1492129080263492.

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Martins, Marilia Compagnoni [UNESP]. "Desenvolvimento da peri-implantite induzida por ligadura em diferentes superfícies de implantes osseointegrados. Análise clínica e radiográfica em cães." Universidade Estadual Paulista (UNESP), 2000. http://hdl.handle.net/11449/96213.

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Made available in DSpace on 2014-06-11T19:28:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2000-04-26Bitstream added on 2014-06-13T20:27:59Z : No. of bitstreams: 1 martins_mc_me_arafo.pdf: 1209084 bytes, checksum: 7b11e93ab4898fd54b0df7617be967e1 (MD5) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Foram avaliados, clínica e radiograficamente, as reações de quatro diferentes superfícies de implante frente ao desenvolvimento e progressão da peri-implantite: Ticp: titânio comercialmente puro; TPS: titânio revestido com plasma spray de titânio; HA: hidroxiapatita; Ost. Superfícies tratadas com ácidos. Para tanto, foram utilizados seis cães, cujos pré-molares inferiores e superiores foram extraídos. Decorridos 90 dias, os implantes foram aleatoriamente colocados, e iniciou-se o controle químico e mecânico do biofilme bacteriano; após o período de osseointegração (90 dias) foram colocados os conectores, e após 45 dias da colocação dos conectores, iniciou-se a indução da peri-implantite por meio de ligaduras de fio de algodão (suspensão do controle do biofilme bacteriano), e os primeiros exames clínicos (profundidade de sondagem, sangramento à sondagem, índices de placa e sangramento, e mobilidade) e radiográficos (perda óssea) foram realizados. Esses parâmetros foram novamente avaliados após 20, 40 e 60 dias, quando da troca das lidaguras. A análise dos resultados não demonstrou diferença significante entre as superfícies, em nenhum dos parâmetros analisados, com exceção da mobilidade (avaliada pelo PeriotestÒ) e perda óssea, que foram menores nos implantes TPS. Concluiu-se que as superfícies apresentam comportamento semelhante durante a indução da peri-implantite, com exceção no parâmetros mobilidade e perda óssea, que apresentaram os implantes TPS com comportamento superior. The reactions of four different implant surfaces were evaluated in regard to the development and progression of peri-implantitis: titanium commercially pure (Ticp), titanium plasma spray (TPS) hidroxiapatite coated (HA) and acid attached surfaces (Ost). Six dogs had their premolars extracted. After 90 days, the implants were ramdonly placed and the dogs receive soft diet, chemical and mechanical plaque control; after the osseointegration period (90 days), the healing abutments were placed. After the healing period (45 days), the plaque control was suspended, and cotton ligatures were installed when the first clinical (probing depth, bleeding on probing, plaque index, bleeding index, and mobility) and radiographic (bone loss) exams were taken. These parameters were re-exanimate after 20, 40 and 60 days, when the ligatures were changed. The results did not show significant differences between the surfaces in any parameter observed except for the mobility (evaluated with PeriotestÒ), and bone loss. These two parameters had the TPS surface with the lower rates. It was conclude that the surfaces show similar behavior during the induction of peri-implantitis, except for the mobility and bone loss parameters witch the TPS implants had better behavior.

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Saez, Daniel Martinez. "Avaliação da influência dos formatos DICOM e JPEG na reprodutibilidade de pontos cefalométricos em Telerradiografia digital em Norma Frontal." Universidade Metodista de São Paulo, 2009. http://tede.metodista.br/jspui/handle/tede/1272.

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Made available in DSpace on 2016-08-03T16:31:14Z (GMT). No. of bitstreams: 1 DANIEL MARTINEZ SAEZ.pdf: 1606570 bytes, checksum: c2773e8408583cb2ada8e4b43508558e (MD5) Previous issue date: 2009-03-31 The digital image on DICOM format request a large store size capability, making difficult the transmission through internet, usually requesting the image compression via JPEG file format. The aim of this study was to evaluate the influence of DICOM and JPEG file formats on Quality Factors 100, 80 and 60, in the reproducibility intra and interexaminer at cephalometrics landmarks identification at digital Frontal Teleradiographies. The sample consists of 120 digital images of Frontal Teleradiographies, obtained from 30 individuals. The 30 original images in DICOM format was converted into a JPEG format on Quality Factors 100, 80 and 60. After blind and random the sample, three calibrated orthodontist marked 18 cephalometric points on each image using a computerized cephalometric program which has in account cephametric points values in a X and Y cartesians coordinates system. At the results, the statistical tests at intraclasses correlations and variant analysis (ANOVA) presents a reproducibility agreement of the cephalometric points on digital Frontal Teleradiographies on intra such as interexaminer, except for points ZL, ZR, AZ, JR, NC, CN on coordinate Y and A6 on coordinate X, independently of file formats. As a conclusion, the file formats DICOM and JPEG on Quality Factors 100, 80 and 60 do not affected the reproducibility intra and interexaminers on a cephalometric landmarks identification.(AU) A imagem digital no formato DICOM requer grande espaço para armazenamento, dificultando o arquivamento e transmissão da imagem via internet, sendo necessária, muitas vezes, a compressão das imagens por meio de formatos de arquivo como o JPEG. O objetivo neste estudo foi avaliar a influência dos formatos DICOM e JPEG, nos Fatores de Qualidade 100, 80 e 60, na reprodutibilidade intra e interexaminador na marcação de pontos cefalométricos em Telerradiografias digitais em Norma Frontal. A amostra consistiu de 120 imagens digitais de Telerradiografias em Norma Frontal, obtidas de 30 indivíduos. As 30 imagens originais, em formato DICOM, posteriormente, foram convertidas para o formato JPEG, nos Fatores de Qualidade 100, 80 e 60. Após cegar e randomizar a amostra, três ortodontistas calibrados marcaram os 18 pontos cefalométricos em cada imagem utilizando um programa de cefalometria computadorizada, que registra as medidas dos pontos cefalométricos em um sistema de coordenadas cartesianas X e Y. Nos resultados, os testes estatísticos de correlações intraclasses e análise de variância (ANOVA) apresentaram concordância de reprodutibilidade dos pontos cefalométricos em Telerradiografias digitais em Norma Frontal, tanto intra como interexaminador, com exceção dos pontos ZL, ZR, AZ, JR, NC, CN na coordenada Y e A6 na coordenada X, independentemente dos formatos de arquivo. Em conclusão, os formatos de arquivo DICOM e JPEG, nos Fatores de Qualidade 100, 80 e 60, não afetaram a reprodutibilidade intra e interexaminador na marcação dos pontos cefalométricos.(AU)

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Jorgenson, Todd F. "Comparison of two imaging modalities : F-speed film and digital images for detection of osseous defects in patients with vertical bone defects /." Oklahoma City : [s.n.], 2003.

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Pereira, Ana Patricia de Sousa [UNESP]. "Avaliação das alterações tegumentares produzidas pelo aparelho de Herbst em indivíduos classe II divisão 1º, tratados em diferentes estágios de crescimento." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/95755.

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Made available in DSpace on 2014-06-11T19:27:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-05-18Bitstream added on 2014-06-13T19:56:53Z : No. of bitstreams: 1 pereira_aps_me_arafo.pdf: 2580064 bytes, checksum: a67d152abefb1c415091c79bd9acff7a (MD5) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Esta pesquisa teve como objetivo realizar estudo cefalométrico das alterações tegumentares no tratamento da má oclusão de Classe II com o aparelho de Herbst. No primeiro estudo, avaliou-se as alterações tegumentares em pacientes com má oclusão de Classe II divisão 1, tratados com o aparelho de Herbst, após o pico de crescimento pubertário. A amostra foi composta por 71 indivíduos, sendo um grupo tratado (n=32) com o aparelho de Herbst e outro grupo controle canadense (n=39) com características iniciais semelhantes à do grupo tratado, acompanhado sem tratamento. Utilizou-se o teste t de Student para análise estatística. Concluiu-se que as alterações tegumentares foram maiores na região de lábio inferior e ângulo mentolabial e que a convexidade da face foi reduzida de forma significativa, melhorando a estética facial. No segundo estudo avaliou-se as mudanças tegumentares promovidas pelo aparelho de Herbst, em dois grupos distintos de indivíduos com má oclusão de Classe II divisão 1: Grupo 1: 20 indivíduos com idade inicial de 8 a 10 anos, tratados com o aparelho de Herbst por 7 meses, antes do pico de crescimento pubertário, e, Grupo 2: 24 indivíduos com idade inicial de 13 a 17 anos, tratados por 8 meses, após o pico de crescimento pubertário. Utilizou-se o teste t de Student para análise estatística. O tratamento não promoveu interferência na maxila e lábio superior, independente da fase de crescimento facial. Os incisivos e lábio inferior foram protruídos nos dois grupos e o pogônio tegumentar exibiu projeção significante no grupo pré-pico. Ocorreu diminuição da convexidade facial e esquelética em ambos os grupos e de forma mais proeminentes no grupo pré-pico This research aims to perform a cephalometric study of soft tissue profile changes in the treatment of Class II division 1 malocclusion with the Herbst appliance. In the first study, the soft tissue changes in patients with Class II division 1 malocclusion, treated with the Herbst appliance, after the pubertal growth peak were evaluated. The sample consisted of 71 individuals, Class II malocclusion division 1 after the pubertal growth peak, divided into two groups: one group treated (n=32) with the Herbst appliance, and the canadian control group (n=39) followed without treatment. Statistical analysis was tested with Student’s t test. . It was demonstrated that changes in soft tissue profile were pronounced in the region of the lower lip and mentolabial angle. The convexity of soft tissue profile was reduced significantly, improving facial aesthetics. In the second study, soft tissue changes promoted by the Herbst appliance in two distinct groups of patients with Class II division 1 malocclusion were evaluated; Group 1: 20 subjects, initial ages between 8 and 10 years treated with the Herbst appliance for 7 months before the pubertal growth peak (pre-peak); Group 2: 24 subjects with initial ages between 13 and 17 years treated with the same unit for eight months after the pubertal growth peak (post-peak). Statistical analysis was tested with Student’s t test. No interference in the maxilla and upper lip position was observed in both groups. The lower incisors proclined and the lower lip protruded in both groups and the projection of soft tissue pogonion in pre-peak group was significantly. There was a reduction of facial convexity with the most prominent changes in the pre-peak group

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Liedke, Gabriela Salatino. "Influência da presença de materiais metálicos na capacidade diagnóstica de diferentes métodos por imagem - radiografia convencional, radiografia digital e tomografia computadorizada de feixe cônico - investigação in vitro." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/102539.

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O objetivo desta tese foi avaliar a interferência da presença de materiais metálicos na imagem radiográfica e tomográfica por meio da análise da adaptação marginal de restaurações e coroas metálicas. Esta investigação resultou em 3 artigos: uma revisão sistemática da literatura para identificar o estado da arte com relação ao uso dos métodos radiográficos; um estudo in vitro comparando o desempenho do filme radiográfico convencional e dos sistemas digitais VistaScan Dürr Dental, Digora Classic Soredex e Express Instrumentarium – com e sem o emprego de filtros para o pós processamento da imagem; e um estudo in vitro avaliando o processamento das imagens da TCFC – utilizando diferentes espessuras de reconstrução. Na revisão sistemática foram incluídos 14 estudos, sendo classificados de baixa ou moderada qualidade, de acordo com os critérios QUADAS de classificação. Na investigação radiográfica (artigo 2), os maiores valores de sensibilidade (0,67 0,83), especificidade (0,81 0,92) e acurácia (0,73 0,86) foram obtidos com radiografias convencionais e imagens digitais originais. Na avaliação tomográfica (artigo 3), os valores da aucROC variaram de 0,60 a 0,72, sendo que o limite inferior do intervalo de confiança mostrou-se abaixo ou muito próximo da linha de referencia. Frente aos resultados, conclui-se que imagens radiográficas originais (convencionais ou digitais) devem ser preferidas para a avaliação de dentes com restaurações metálicas. Quanto à TCFC, mesmo quando se aumenta a espessura de reconstrução da imagem e diminui-se o artefato, ainda assim não há melhora na acurácia do diagnóstico. The aim of this thesis was to evaluate the interference of the presence of metallic materials on radiographic and tomographic image by assessing misfits tooth and restoration in metal-restored teeth. This investigation resulted in three articles: a systematic review of the literature to identify the state of the art on the use of radiographic methods; an in vitro study comparing the performance of conventional film and digital phosphor plate systems Vistascan Dürr Dental, Digora Classic Soredex and Instrumentarium Express – exported as original images and with the use of post processing filters; and an in vitro study evaluating the post-processing of CBCT images – using diverse reconstruction thicknesses. The systematic review retrived 14 studies, classified as low- / moderate quality based on QUADAS criteria. For radiographic evaluation (article II), higher sensitivity (0.67 0.83), specificity (0.81 0.92) and accuracy (0.73 0.86) values were obtained with conventional and digital original images. For tomographic evaluation (article III), mean aucROC ranged from 0.60 to 0.72, and the analysis of the 95% CI showed the lower bound of the curve bellow or very close to the reference line. Based on the results, it is concluded that original images (conventional or digital) should be preferred for the assessment of teeth with metal restorations. Considering CBCT images, even thought increased reconstruction thickness decreased perceived artifact, it did not improve diagnosis accuracy.

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Moraes, Michelle Bianchi de [UNESP]. "Influência das variações de ângulos de projeção na detecção de reabsorções radiculares linguais e apicais simuladas: comparação entre subtração radiográfica digital e radiografia digital direta." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/105861.

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Made available in DSpace on 2014-06-11T19:35:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-08-05Bitstream added on 2014-06-13T18:46:28Z : No. of bitstreams: 1 moraes_mb_dr_sjc.pdf: 1197811 bytes, checksum: 257ea85b7a3e332fae697c54b7a1c2a9 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) A reabsorção severa da raiz diagnosticada tardiamente pode acarretar a perda dentaria, e sendo a técnica de subtração radiográfica digital (SDR) um importante recurso para detecção precoce de alterações minerais, este estudo avaliou a eficiência no diagnóstico precoce da reabsorção radicular externa simulada apical e lingual, pela técnica de subtração radiográfica digital (SRD) e radiografia digital (RD). Foram utilizados 14 dentes incisivos de mandíbulas humanas maceradas com reabsorções de diferentes dimensões, simuladas na região apical e lingual, e radiografados com variação de ângulos de projeção. As radiografias foram subtraídas pelo programa Regeemy®, e para avaliação do desempenho dos métodos de diagnóstico, pares de radiografias periapicais e imagens subtraídas foram apresentadas a 2 radiologistas. De acordo com os resultados, não foram observadas diferenças estatisticamente significativas entre os métodos na detecção de reabsorções linguais, independentemente do tamanho da lesão, assim como não houve diferença entre os métodos na detecção de reabsorções apicais, com exceção do examinador 2 com relação a variação angular vertical e horizontal de 100 utilizando o maior nível de desgaste, que apresentou a radiografia digital como método superior na avaliação em relação a subtração radiográfica. E o aumento no nível de desgastes e a menor variação dos ângulos verticais e horizontais permitiram melhor avaliação nas regiões de reabsorções apicais e linguais, para detecção das reabsorções apicais e linguais. Com estes resultados podemos concluir que a subtração radiográfica digital é um exame indicado para detecção de pequenas perdas minerais em radiografias que apresentem pouca ou nenhuma variação nas angulações verticais e horizontais The severe root resorption diagnosed late can lead to tooth loss, and being the technique of digital subtraction radiography (SDR) as an important resource for early detection mineral changes, this study evaluated the efficiency in the early diagnosis simulated external root resorption apical and lingual by the technique of digital subtraction radiography (SRD) and digital radiography (DR). We used 14 human incisors jaw macerated with resorption different sizes, simulated in the apical and lingual, and radiographed with a range of projection angles. The radiographs were subtracted by the program Regeemy ®, and performance evaluation diagnostic methods, pairs intraoral radiographs and subtracted images were presented to two radiologists. According to the results, there were no statistically significant differences between methods in the detection lingual resorption, regardless of lesion size, as there was no difference between the methods in the detection of apical resorption, except the second examiner with respect to variation vertical and horizontal angle of 100 using the highest level of wear, which lodged the digital radiography as a method superior in the evaluation for subtraction radiography. And the increase in the level of wear and less variation vertical and horizontal angles allowed a better assessment resorption in the regions apical and lingual to detect and lingual apical resorption. With these results we conclude that the digital subtraction radiography is a test for the detection of small mineral loss in radiographs showing little or no variation in vertical and horizontal angles

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Vaz, Sergio Lins de Azevedo 1984. "Exatidão de filtros de imagem na avaliação radiográfica do nível ósseo peri-implantar." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288931.

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Orientador: Paulo Sérgio Flores Campos Texto do capítulo 1 em inglês Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba Made available in DSpace on 2018-08-20T12:07:20Z (GMT). No. of bitstreams: 1 Vaz_SergioLinsdeAzevedo_M.pdf: 1201820 bytes, checksum: c01a9a7bcc2ca60b934986c91f46e192 (MD5) Previous issue date: 2012 Resumo: O objetivo neste trabalho foi identificar a exatidão de alguns filtros de imagem na mensuração do nível ósseo peri-implantar, por meio da radiografia digital. Para isso, vinte implantes de titânio (Titamax, Neodent, Curitiba, PR, Brasil) foram instalados em seis fragmentos de costelas bovinas, nas quais foram criados defeitos do tipo perda óssea. Utilizando um sistema intra-bucal de placas de fósforo (Vista Scan, Dürr Dental, Beitigheim-Bissingen, Alemanha), radiografias periapicais foram realizadas posicionando os implantes segundo a técnica do paralelismo. Após a obtenção das imagens, nove filtros do software DBSWIN foram aplicados: fine, caries 1, caries 2, perio, endo, noise reduction, invert, emboss e sculpture. Um avaliador mensurou as distâncias entre o ombro do implante à porção mais apical do defeito no software Image J. Os defeitos também foram mensurados nas costelas bovinas utilizando um paquímetro digital. O teste não-paramétrico de Friedman comparou os valores obtidos nas imagens com aplicação dos filtros aos encontrados nas imagens originais e nas costelas bovinas, adotando nível de significância de 5%. Os resultados mostraram diferenças estatisticamente significantes para os filtros caries1, caries2, endo e perio (P < 0.05) tanto em relação às imagens originais, quanto em relação às mensurações obtidas com o paquímetro. As mensurações obtidas com as imagens originais, filtros fine e emboss foram mais próximas às obtidas com o paquímetro. Concluiu-se que os filtros fine e emboss foram os mais exatos na mensuração do nível ósseo peri-implantar, sendo equiparáveis às imagens originais. Os filtros caries1, caries2, endo e perio foram os menos exatos, não sendo indicados para este fim Abstract: This study aimed to identify the accuracy of some enhancement filters of an intraoral phosphor-plate system for measuring the simulated periimplant bone level. Twenty titanium implants (Titamax, Neodent, Curitiba, PR, Brazil) were placed into six fragments of bovine ribs and defects simulating bone loss were created. Periapical radiographs were taken with a phosphor-plate system (Vista Scan, Dürr Dental, Beitigheim-Bissingen, Germany) according to the paralleling standard technique, and nine enhancement filters were applied: fine, caries 1, caries 2, perio, endo, noise reduction, invert, emboss and sculpture. An oral radiologist measured on the Image J software the distance from the neck of the implant to the most apical contact of the bone with the implant. The Friedman non-parametric test compared the radiographic measurements to those obtained on the bovine ribs with a digital caliper. The significance level adopted was 5%. The caries1, caries2, endo, and perio filters resulted on measurements statistically different from both the original images and the measures of the digital caliper (P < 0.05). In conclusion, the fine and emboss filters resulted on the most precise filters, with similar measures to the original images. The caries1, caries2, endo, and perio filters were the less accurate for measuring the periimplant bone level Mestrado Radiologia Odontologica Mestre em Radiologia Odontológica

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Bittar-Cortez, Juliana Araujo. "Radiografia digital e a tecnica de subtração no monitoramento da desmineralização e remineralização do esmalte dentario." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288985.

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Orientador: Francisco Haiter Neto Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba Made available in DSpace on 2018-08-10T07:50:35Z (GMT). No. of bitstreams: 1 Bittar-Cortez_JulianaAraujo_D.pdf: 5858192 bytes, checksum: 3d3d3c7dbc08b34e4b7c483e7316bd88 (MD5) Previous issue date: 2008 Resumo: O objetivo deste estudo in vitro foi comparar dois protocolos de remineralização em lesões de cárie no esmalte dentário, avaliados por meio de análises de cálcio (Ca) e fósforo (Pi), dureza do esmalte, microscopia de luz polarizada e subtração radiográfica digital (SRD); avaliar a viabilidade da utilização de dois diferentes sistemas de radiografias digitais, placa PSP (photostimulable storage phosphor) e sensor CMOS (complementary metal oxide semicondutor), no diagnóstico de desmineralizações, e a acurácia das radiografias digitais convencionais (RDC) e três métodos de SRD (linear, avançada e logarítmica) no diagnóstico de mudanças minerais; e comparar o ruído e reprodutibilidade das imagens de SRD lineares e logarítmicas produzidas a partir de dois sistemas de radiografias digitais. Para isso, lesões de cárie artificiais foram criadas em 100 superfícies proximais de dentes hígidos. Vinte dentes foram mantidos como controle e oitenta foram submetidos a dois diferentes protocolos de remineralização em 4 e 8 semanas, com a contínua imersão em saliva artificial e um tratamento adicional com flúor. Radiografias digitais foram realizadas antes e depois dos protocolos de remineralização. Cinco examinadores avaliaram a desmineralização e as mudanças minerais nas RDC, dispostas lado a lado, e três métodos da SRD. As análises de Ca / Pi e a colocação dos dentes na solução remineralizante foram considerados como padrão ouro. A média dos tons de cinza e o desvio padrão (DP) no histograma foram também mensurados. As concentrações de Ca e Pi na saliva artificial após os tratamentos foram significativamente menores do que a solução original (p<0,05); e por meio da SRD foi possível verificar diferenças entre as imagens. Entretanto, o teste de dureza e a microscopia de luz polarizada não detectaram nenhuma alteração. O sistema CMOS foi significativamente mais acurado do que a sistema PSP no diagnóstico da desmineralização e mudanças minerais, assim como a SRD linear no diagnóstico de mudanças minerais. Também foram estatisticamente diferentes os valores da média dos níveis de cinza e do DP entre os dois sistemas. Foi concluído que (a) o tratamento adicional de flúor promoveu valores maiores de ganho mineral; (b) a análise de Ca / Pi na saliva artificial foi o método mais sensível na avaliação de alteração mineral; (c) a imagem de SRD linear é um método válido na detecção do aumento de intensidade, como sinal de ganho mineral; e (d) as imagens de SRD utilizando as placas PSP tiveram um menor ruído do que nas imagens geradas pelo sensor CMOS Abstract: The aim of this in vitro study was to compare two remineralization protocols of artificial carious lesions in enamel, evaluated by Calcium (Ca) and Phosphorus (Pi) analysis, cross-section hardness test, polarized light microscopy and digital subtraction images (DSR); to assess the feasibility of using two different systems of digital radiography, photostimulable storage phosphor (PSP) plate and complementary metal oxide semiconductor (CMOS) sensor on the demineralization diagnosis, and the accuracy of digital conventional radiographs (DCR) and three methods of DSI (linear, advanced and logarithmic) on mineral changes diagnosis; and, to compare noise and reproducibility in linear and logarithmic DSI produced from two digital radiography systems. Artificial caries-like lesions on 100 approximal surfaces of sound teeth were produced. Twenty teeth were kept as control and eighty teeth were subjected to two different remineralization protocols for 4 and 8 weeks, with continuous immersion in artificial saliva, and additional fluoride treatment. Digital radiographs were taken before and after the remineralization protocols. Five examiners assessed demineralization and mineral changes on DCR, placed side by side, and three methods of DSI. Ca / Pi analysis and the placement of the teeth on the remineralization solution was the gold standard. The mean shades of gray and the standard deviation (SD) of the histogram were also assessed. The concentrations of Ca and Pi in the artificial saliva after the treatments were significantly lower than the original solution (p<0.05); and DSR showed differences between the images. However, the Hardness test and polarized light microscopy did not detect any changes. CMOS system was significantly more accurate than PSP system on demineralization and mineral changes diagnosis, and also linear DSR on mineral changes diagnosis. It was also statistically significant different the values of mean shades of gray and SD between both systems. It was concluded that (a) the additional Fluoride treatment provided higher values of mineral gained; (b) Ca / Pi analysis in the artificial saliva were the most sensitive method of mineral change evaluation; (c) linear DSI is a valuable method to disclose an intensity increase, as a sign of mineral gained; and (d) DSR images created from PSP plates had less noise than images produced from CMOS sensor Doutorado Radiologia Odontologica Doutor em Radiologia Odontológica

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Assis, Afonso Celso Souza de. "Estudo da viabilidade do emprego da técnica de subtração radiográfica digital em radiografias periapicais com registro a posteriori /." São José dos Campos : [s.n.], 2010. http://hdl.handle.net/11449/98003.

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Orientador: Luiz Cesar de Moraes Banca: Pedro Luiz de Carvalho Banca: Cristiane Yumi Koga Ito Resumo: Apesar de ser uma técnica limitada, a subtração digital é utilizada na Odontologia. A adição do computador e seus algoritmos para equalização de contraste e também correção geométrica, tornou possível a aplicação da subtração radiográfica digital (SRD), utilizando radiografias intrabucais. Neste estudo foi avaliada a viabilidade da utilização da subtração radiográfica digital pelo programa Regeemy - Image Registration and Mosaicking v.0.2.43-RCB (DPI-INPE, São José dos Campos, SP, Brazil) em radiografias periapicais digitalizadas e obtidas sem utilização de padronização rígida durante as exposições por meio de registro a posteriori. A seleção dos pontos de controle foram realizadas de forma automática e em quantidade múltipla pelo Reggemy. Esses pontos serviram como coordenadas a partir das quais o programa alinhou o par de imagens e gerou uma terceira imagem de acordo com a projeção geométrica da imagem de referência. Com o uso do Adobe Photoshop© foram selecionados os ROI das imagens utilizando guias e coordenadas. Depois de aplicados os testes estatísticos foi verificado que a metodologia do presente estudo não permite concluir que a subtração utilizando-se o programa Regeemy é inviável quando realizada sem padronização Abstract: The digital subtraction has been widely used in dentistry. The addition of computer and its algorithms for equalization of contrast and geometric correction also made possible the application of radiographic digital subtraction (SRD) using intraoral radiographs. This study assessed the feasibility of using X-ray digital subtraction of the program Regeemy - Image Registration and mosaicking v.0.2.43-RCB (DPI-INPE, Sao Jose dos Campos, SP, Brazil) in periapical radiographs digitized and obtained without the use of standardized rigid during the exposures by registering the event. The selection of control points were performed automatically and in quantity by multiple Reggemy. These points were used as coordinates from which the program aligned the image pair and a third image generated according to the geometrical projection of the reference image. Using Adobe Photoshop ©, we selected the ROI of the images using guides and coordinates. After applying the statistical tests we can conclude that the methodology of this study does not suggest that the subtraction using the program Regeemy is feasible when performed without standardization. It is suggested further studies to evaluate the impact of subtraction radiography with no standardization in clinical diagnosis Mestre

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Martins, Marilia Compagnoni. "Desenvolvimento da peri-implantite induzida por ligadura em diferentes superfícies de implantes osseointegrados. Análise clínica e radiográfica em cães /." Araraquara : [s.n.], 2000. http://hdl.handle.net/11449/96213.

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Resumo: Foram avaliados, clínica e radiograficamente, as reações de quatro diferentes superfícies de implante frente ao desenvolvimento e progressão da peri-implantite: Ticp: titânio comercialmente puro; TPS: titânio revestido com plasma spray de titânio; HA: hidroxiapatita; Ost. Superfícies tratadas com ácidos. Para tanto, foram utilizados seis cães, cujos pré-molares inferiores e superiores foram extraídos. Decorridos 90 dias, os implantes foram aleatoriamente colocados, e iniciou-se o controle químico e mecânico do biofilme bacteriano; após o período de osseointegração (90 dias) foram colocados os conectores, e após 45 dias da colocação dos conectores, iniciou-se a indução da peri-implantite por meio de ligaduras de fio de algodão (suspensão do controle do biofilme bacteriano), e os primeiros exames clínicos (profundidade de sondagem, sangramento à sondagem, índices de placa e sangramento, e mobilidade) e radiográficos (perda óssea) foram realizados. Esses parâmetros foram novamente avaliados após 20, 40 e 60 dias, quando da troca das lidaguras. A análise dos resultados não demonstrou diferença significante entre as superfícies, em nenhum dos parâmetros analisados, com exceção da mobilidade (avaliada pelo PeriotestÒ) e perda óssea, que foram menores nos implantes TPS. Concluiu-se que as superfícies apresentam comportamento semelhante durante a indução da peri-implantite, com exceção no parâmetros mobilidade e perda óssea, que apresentaram os implantes TPS com comportamento superior. Abstract: The reactions of four different implant surfaces were evaluated in regard to the development and progression of peri-implantitis: titanium commercially pure (Ticp), titanium plasma spray (TPS) hidroxiapatite coated (HA) and acid attached surfaces (Ost). Six dogs had their premolars extracted. After 90 days, the implants were ramdonly placed and the dogs receive soft diet, chemical and mechanical plaque control; after the osseointegration period (90 days), the healing abutments were placed. After the healing period (45 days), the plaque control was suspended, and cotton ligatures were installed when the first clinical (probing depth, bleeding on probing, plaque index, bleeding index, and mobility) and radiographic (bone loss) exams were taken. These parameters were re-exanimate after 20, 40 and 60 days, when the ligatures were changed. The results did not show significant differences between the surfaces in any parameter observed except for the mobility (evaluated with PeriotestÒ), and bone loss. These two parameters had the TPS surface with the lower rates. It was conclude that the surfaces show similar behavior during the induction of peri-implantitis, except for the mobility and bone loss parameters witch the TPS implants had better behavior. Orientador: Ricardo Samih Georges Abi Rached Coorientador: Elcio Marcantonio Junior Banca: Rosemary Adriana Chiérice Marcantonio Banca: Luiz Antonio Pugliesi Alves de Lima Mestre

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Lima, Vicente José Muratore de. "\"Estudo prospectivo dos parâmetros periodontais e peri-implantares dos pilares que recebem prótese dento-implanto-suportada\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/23/23137/tde-30102006-153856/.

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Desde a introdução dos implantes na Odontologia, controvérsias tem havido acerca da propriedade de conectar os implantes a dentes em próteses fixas. Os implantes osseointegrados não apresentam nenhum ligamento periodontal e são mais firmemente ancorados ao osso. A diferença apresentada nesta ancoragem tem levantado preocupações acerca de o implante osseointegrado, por sua firme fixação ao osso, apresentar pouca flexibilidade para dividir as cargas funcionais com os dentes conectados. O presente estudo teve como propósito acompanhar prospectivamente os parâmetros periodontais ? índice gengival, índice de sangramento, profundidade de sondagem e perda de inserção entre o dente pilar de uma prótese dento-implanto-suportada com o dente colateral do mesmo paciente, e também os parâmetros peri-implantares dos implantes que suportam estas próteses - índice gengival; índice de sangramento; profundidade de sondagem e perda de inserção. Para verificar a perda de inserção foi utilizado o recurso da subtração radiográfica da região em que a prótese foi instalada, com tomadas radiográficas efetuadas no momento da instalação da prótese, decorridos seis meses e após 12 meses de uso, com o objetivo de verificar a ocorrência, ou não, de alteração do suporte ósseo peri-implantar. Foram selecionados 12 pacientes com estado de saúde normal, apresentando área posterior de mandíbula edêntula onde estava indicada a reabilitação protética por meio de prótese fixa unindo dente a implante. Estes foram tratados com implante de um estágio de 10 mm padrão da Straumann (ITI), que apresenta um pescoço polido de 2.8mm, onde a porção do implante que permanece intra-óssea apresenta uma superfície tratada, com diâmetro de 4.1mm. O implante foi instalado no espaço onde se localizaria o retentor mais distal da futura prótese parcial fixa, seguindo o protocolo. As radiografias digitais obtidas foram avaliadas num software de subtração radiográfica, Matrox Inspector versão oito, para verificar a alteração da variação de densidade óptica e contraste das radiografias quando superpostas, sendo os valores observados no implante comparados com os critérios de sucessos , amplamente abordados nos estudos verificados. Todos os implantes instalados nos pacientes osseointegraram, não houve registro de alteração óssea ao redor dos mesmos e nos dentes pilares das próteses em avaliações feitas após seis meses e 12 meses. As próteses continuaram clinicamente em excelente estado após 12 meses de avaliação nas análises clínicas e radiográficas. Ainda, de acordo com o teste de Sinais de Postos de ilcoxon, concluiu-se estatisticamente que não houve diferença nos parâmetros peri-implantares de cada paciente durante os períodos analisados (zero, seis meses e 12 meses), bem como quando comparados com os respectivos dentes colaterais. Since the introduction of implants in Dentistry, controversies have arisen about the possibility of connecting implants to teeth in fixed prostheses. Osseointegrated implants do no present any periodontal ligature and are more firmly anchored to the bone. The difference presented by this type of anchorage has led to some concern about the limited flexibility of the osseointegrated implant to share the functional loads with the connected teeth. This study intended to follow-up prospectively the periodontal parameters bleeding index, probing depth between the pillar tooth of an implant supported prosthesis with one control tooth of the same patient and also the implants that support theses prostheses. That is why subtraction radiography of the region in which the prosthesis was placed was used, with radiographs taken at prosthesis placement, after six months and one year of use to verify if the periimplant osseous support had or had not undergone changes. Twelve patients with normal health conditions were selected who presented a posterior area edentulous jaw where a prosthetic rehabilitation by a fixed prosthesis joining tooth to implant was indicated. Patients were treated with an implant of one stage of 10mm standard Straumann (ITI) with a 2.8 mm polished neck, in which the remaining intraosseous portion of the implant has a treated surface of 4.1 mm diameter. The implant was placed in the space where according to the protocol, the more distal retainer of the future fixed partial prosthesis would be located. Digital radiographs were assessed with a subtraction radiography software Matrox Inspector version eight, to corroborate the change of contrast in the radiographs when superimposed, with values observed in the implant compared with the success criteria , widely mentioned in surveyed studies. All implants placed in patients became osseointegrated. There was no record of bone change around them and in the dental pillars of the prostheses at the one year follow-up. Prostheses continue to be in excellent conditions after the one year follow-up based upon clinical and radiographic analyses. Furthermore, in accordance with the Wilcoxon test of matched pairs and signed rank, it was concluded that there was no statistical difference between each group of each patient during the time period analyzed (baseline and one year) as well as when the pillars were compared to their respective controls.

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Assis, Afonso Celso Souza de [UNESP]. "Estudo da viabilidade do emprego da técnica de subtração radiográfica digital em radiografias periapicais com registro a posteriori." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/98003.

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Made available in DSpace on 2014-06-11T19:29:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-05-31Bitstream added on 2014-06-13T19:26:45Z : No. of bitstreams: 1 assis_acs_me_sjc.pdf: 596243 bytes, checksum: fb9783652a81f3cb2ec3e7e3c9337fbc (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Apesar de ser uma técnica limitada, a subtração digital é utilizada na Odontologia. A adição do computador e seus algoritmos para equalização de contraste e também correção geométrica, tornou possível a aplicação da subtração radiográfica digital (SRD), utilizando radiografias intrabucais. Neste estudo foi avaliada a viabilidade da utilização da subtração radiográfica digital pelo programa Regeemy – Image Registration and Mosaicking v.0.2.43-RCB (DPI-INPE, São José dos Campos, SP, Brazil) em radiografias periapicais digitalizadas e obtidas sem utilização de padronização rígida durante as exposições por meio de registro a posteriori. A seleção dos pontos de controle foram realizadas de forma automática e em quantidade múltipla pelo Reggemy. Esses pontos serviram como coordenadas a partir das quais o programa alinhou o par de imagens e gerou uma terceira imagem de acordo com a projeção geométrica da imagem de referência. Com o uso do Adobe Photoshop© foram selecionados os ROI das imagens utilizando guias e coordenadas. Depois de aplicados os testes estatísticos foi verificado que a metodologia do presente estudo não permite concluir que a subtração utilizando-se o programa Regeemy é inviável quando realizada sem padronização The digital subtraction has been widely used in dentistry. The addition of computer and its algorithms for equalization of contrast and geometric correction also made possible the application of radiographic digital subtraction (SRD) using intraoral radiographs. This study assessed the feasibility of using X-ray digital subtraction of the program Regeemy - Image Registration and mosaicking v.0.2.43-RCB (DPI-INPE, Sao Jose dos Campos, SP, Brazil) in periapical radiographs digitized and obtained without the use of standardized rigid during the exposures by registering the event. The selection of control points were performed automatically and in quantity by multiple Reggemy. These points were used as coordinates from which the program aligned the image pair and a third image generated according to the geometrical projection of the reference image. Using Adobe Photoshop ©, we selected the ROI of the images using guides and coordinates. After applying the statistical tests we can conclude that the methodology of this study does not suggest that the subtraction using the program Regeemy is feasible when performed without standardization. It is suggested further studies to evaluate the impact of subtraction radiography with no standardization in clinical diagnosis

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MELO, áureo Honorato e. "Estudo comparativo da densidade radiográfica de diferentes cimentos odontológicos restauradores à base de ionômero de vidro." Universidade Federal de Goiás, 2007. http://repositorio.bc.ufg.br/tede/handle/tde/1366.

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Made available in DSpace on 2014-07-29T15:21:57Z (GMT). No. of bitstreams: 1 Dissertacao - Aureo Honorato e Melo.pdf: 333429 bytes, checksum: 7ff45b837da001c1e75ec7d4524dae41 (MD5) Previous issue date: 2007-10-05 Glass ionomer cements are generally represented by a combination of a powder, which main components are alumina (Al2O3 ), silica (Si2O3 ) and calcium fluoride (CaF2 ), and a liquid, which is an aqueous solution basically compound of polyacrilic acid and tartaric acid. Its excellent features have been described since the 1960 s, and some of these are the radiopacity and fluoride release. The aim of this work is to study the radiopacity measured by radiographic exposures of the following restorative glass ionomers: Vidrion R (SS White Manufacturing Ltd, Gloucester, England); Chemfil (DENTSPLY DeTrey, Konstanz, Germany); Vitro Molar (DFL); Maxxion R (FGM Dental products Ltd); Riva self cure powder and liquid and Riva self cure in capsules (Riva SC, SDI Ltd, Bayswater, Australia) and to make comparisons among them. Then, different radiographic densities from an aluminum scale were attained and they could be compared and used in the clinical work. The specimens were made using standard glass plates (25,4 x 76,2 x 1,0 mm) manufactured by Global Trade Technology and they were perforated by a 5mm bur (number 5, Black & Decker, Brazil) especially used for glass. For the radiopacity evaluation, the samples were radiographed using three different types of films, which are the following: Kodak Dental Intraoral ESpeed Film (EASTMAN KODAK Co., Rochester, N.Y.); Contrast DFL DV-58 (DFL Ltd); and Agfa Dentus M2 Confort (Heraeus Kulzer Inc.). A 99,5% pure aluminum step wedge and a Gnatus XR 6010 X-ray equipment were utilized in this work. The data were collected by 5 examiners, who were properly calibrated, and analyzed by Friedman and Kolmogorov-Smirnov tests. The results showed no statistical differences among the averages of each examiner comparing the cements and the films. And the results also showed that all the cements present radiographic density average values below 1. Os propósitos deste trabalho foram estudar a radiopacidade de cimentos de ionômero de vidro restauradores a partir de tomadas radiográficas e comparálas entre si. Para a consecução, obtiveram-se a partir de uma escala de alumínio, densidades radiográficas comparáveis e possíveis de serem utilizadas no trabalho clínico. Corpos-de-prova cilíndricos foram obtidos utilizando-se lâminas de vidro de 25,4 x 76,2 x 1,0 mm perfuradas por uma broca número 5 com 5,0 mm de diâmetro. As radiografias dos corpos-deprova foram obtidas em três marcas de filmes. Foi utilizado neste experimento uma escala de alumínio padronizada denominada penetrômetro e um aparelho de raios-X Gnatus XR 6010. Os dados foram coletados por cinco examinadores devidamente calibrados e analisados pelos testes de Friedman e de Kolmogorov-Smirnov. Os resultados obtidos mostraram que existiu diferença estatisticamente significante nas médias conseguidas por cada examinador nos grupos formados pelos cimentos e pelos filmes. Também mostrou que todos os cimentos apresentaram valores médios de densidade radiográfica menor que 1.

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Monti, Lira Marcela [UNESP]. "Estudo radiográfico digital e densitométrico em mandíbulas de suínos, submetidas a osteotomia com brocas de alta e baixa rotação, com refrigeração líquida." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/91430.

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Made available in DSpace on 2014-06-11T19:25:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-12-09Bitstream added on 2014-06-13T19:52:59Z : No. of bitstreams: 1 monti_lm_me_araca.pdf: 287560 bytes, checksum: 074e03765d9ead5baba4ea3ffcdf36ee (MD5) Universidade Estadual Paulista (UNESP) Avaliou-se, por meio de exames radiográficos digitais e densitométricos, a influência do tipo de instrumento rotatório para corte, no processo de reparação óssea após osteotomias em mandíbula de suíno em tempos controlados. Foram utilizados para o estudo oito suínos da raça Large White, com peso corpóreo inicial variando de 25 a 30 Kg. Dois cortes transversais do meio à base de mandíbula direita foram realizados, um por meio de instrumento rotatório de alta rotação e o outro pela ação da baixa rotação, ambos com irrigação líquida. Após períodos pré-estabelecidos (7, 28, 60 e 90 dias) os animais foram sacrificados e suas mandíbulas retiradas para estudos radiográficos digitais diretos e indiretos, pelo sistema DIGORA e ODR e de densitometria óptica por imagens radiográficas pelo sistema CROMOX. Nos períodos iniciais (7 e 28 dias) as densitometrias foram maiores na região das osteotomias realizadas com alta rotação e nos períodos finais (60 e 90 dias) as densitometrias foram maiores nas osteotomias feitas com baixa rotação, indicando uma melhor reparação óssea final quando do uso de baixa rotação. A análise qualitativa do processo de reparação foi feita pelo sistema ODR, que possibilitou a obtenção de imagens digitais tridimensionais e coloridas, permitindo comparação das espessuras ósseas com as de uma cunha de alumínio, evidenciando que aos sessenta dias a reparação óssea estava aparentemente completa. Os histogramas do DIGORA apontaram valores de médias de nível de cinza nas áreas de osteotomia, evidenciando uma maior quantidade de tons de cinza nas osteotomias de alta rotação nos primeiros tempos, e nas osteotomias com baixa-rotação nos tempos finais. It was evaluated, through digital and densitometric radiographic exams, the influence of the type of rotating instrument for cut, in the process of bony repair after osteotomy in swine jaw in controlled times. They were used for the study eight Large White swines, with initial corporal weight varying from 25 to 30 Kg. Two traverse cuts of the middle to the base of right jaw were accomplished, one through rotating instrument of high rotation and the other for the action of the low rotation, both with liquid irrigation. After established periods (7, 28, 60 and 90 days) the animals were sacrificed and your mandibles retired for direct and indirect digital radiografic studies, for the DIGORA and ODR systems and of optical densitometry for radiographic images for the CROMOX system. In the initial periods (7 and 28 days) the densitometry were larger in osteotomy areas accomplished with high rotation and in the final periods (60 and 90 days) the densitometry were larger in the osteotomy done with low rotation, indicating a better final bony repair when of the use of low rotation. The qualitative analysis of the repair process was made by the ODR system, that made possible obtaining three-dimensional and colored digital images, allowing comparison of the bony thickness with the one of a wedge of aluminum, evidencing that to the sixty days the bony repair was apparently complete. The histograms of DIGORA pointed values of the averages of ash tones in the osteotomy areas, evidencing a larger amount of ash tones in the osteotomy of high rotation in the first times, and in the osteotomy with low-rotation in the final times.

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SILVA, Janaína Benfica e. "Avaliação do processo de raparo de lesões periopicais pós-tratamento endodôntico por meio de subtração digital radiográfica." Universidade Federal de Goiás, 2006. http://repositorio.bc.ufg.br/tede/handle/tde/1383.

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Made available in DSpace on 2014-07-29T15:22:00Z (GMT). No. of bitstreams: 1 Parte 1.pdf: 1874528 bytes, checksum: 7e46501ade5b782c1d4f3f9926c18a43 (MD5) Previous issue date: 2006-11-30 Control of the process of repair or progression of periapical lesions after endodontic treatment is monitored by conventional or digital radiography. In this research digital subtraction radiography (DSR) was used that uses the subtraction of images longitudinally, in which the change in the alveolar bone is visualized against a uniform gray background. The objectives of this study were: (1) to evaluate the repair process of periapical lesions after endodontic treatment by using DSR; (2) to quantify by means of point/pixel (picture element), area (histogram) and linear measures (profile line), the gain or loss of mineral density in the area of the lesion, using the average of the pixel values; (3) to compare the diagnostic information, suggestive of the repair process, obtained through a subjective evaluation of DSR with a conventional radiographic evaluation and digitalized image and (4) to evaluate the contribution of DSR to an early identification of the repair of periapical lesions after endodontic treatment. The sample consisted of twelve patients with a total of seventeen periapical lesions. The x-rays were digitalized and submitted to DSR using DSR software. The pixel values of the subtracted images were determined by using Image Tool software. Both the conventional x-rays as well as the digitalized and subtracted images were qualitatively evaluated. The results showed a gain in mineral density with a meandp of 133.495.17, 130.275.77 and 129.414.46 for the points/pixel, histogram and profile line tools, respectively. In the evaluation of numerical gain Pearson s Coefficient of Correlation (r) presented these values: mean of points/histogram = 0.746; mean of points/profile line = 0.724 and histogram/profile line = 0.860. When the numerical values were transformed into percentile gain meandp of 0.674.01, 1.214.33 and 1.163.36 were obtained for the points/pixels, histogram and profile line tools, respectively. In the evaluation of the percentile gain Spearman s Coefficient of Correlation (rs) showed the following values: mean of points/histogram = 0.697; mean of the points/profile line = 0.646 and histogram/profile line = 0.844. In the qualitative analysis, the frequency of success in the ordering of the correct sequence of the repair process using conventional radiography, digitalized image and DSR was 37.3%, 31.4% and 31.4%, respectively. One concluded, therefore, that: (1) the process of repair of periapical lesions after endodontic treatment can be evaluated quantitatively by means of longitudinal analysis using DSR; (2) any one of the three tools can be used to quantify the repair, considering that correlation exists between the time of repair and the increase of the value of pixel; (3) the comparative evaluation between the subjective methods using conventional radiography, digitalized image and SDR, it showed that all had been capable to evidence the process of repair of periapical lesions from the first radiography (15 days), not having difference between them and (4) the quantitative evaluation by SDR obtained to after evidence the beginning of the repair with 15 days the beginning of the endodontic treatment, even so this repair was really effective from 105 days after the beginning of the endodontic treatment. O controle do processo de reparo ou progressão de lesões periapicais pós-tratamento endodôntico é monitorado pelo exame radiográfico convencional ou digital. Nesta pesquisa foi utilizada a subtração digital radiográfica (SDR), que utiliza a subtração de imagens longitudinalmente, na qual a mudança no osso alveolar é visualizada contra um plano de fundo (background) cinza homogêneo. Os objetivos desse estudo foram: (1) avaliar o processo de reparo de lesões periapicais pós-tratamento endodôntico por meio de SDR; (2) quantificar por meio de ponto/pixel (picture element), área (histograma) e medida linear (perfil linha) na área da lesão, o ganho ou perda de densidade mineral por meio da média dos valores dos pixels; (3) comparar as informações diagnósticas, sugestivas do processo de reparo, obtidas por meio da avaliação subjetiva da SDR com a avaliação radiográfica convencional e imagem digitalizada; e (4) avaliar a contribuição da SDR na identificação precoce do reparo de lesões periapicais pós-tratamento endodôntico. A amostra constituiu-se de doze indivíduos totalizando dezessete lesões periapicais. As radiografias foram digitalizadas e submetidas à SDR utilizando o programa DSR. As imagens subtraídas tiveram os valores de pixel determinados utilizando o programa Image Tool. Tanto as radiografias convencionais quanto as imagens digitalizadas e subtraídas foram avaliadas qualitativamente. Os resultados evidenciaram ganho de densidade mineral com médiadp de 133,495,17; 130,275,77; 129,414,46 para as ferramentas ponto/pixel; histograma e perfil linha respectivamente. Na avaliação do ganho numérico o Coeficiente de Correlação de Pearson (r) mostrou valores de: média dos pontos/ histograma = 0,746; média dos pontos/ perfil linha = 0,724 e histograma/ perfil linha = 0,860. Quando os valores numéricos foram transformados em ganho percentual foram obtidas médiadp de 0,674,01; 1,214,33; 1,163,36 para as ferramentas ponto/pixel; histograma e perfil linha respectivamente. Na avaliação do ganho percentual o Coeficiente de Correlação de Spearman (rs) mostrou valores de: média dos pontos/ histograma = 0,697; média dos pontos/ perfil linha = 0,646 e histograma/ perfil linha = 0,844. Na análise qualitativa, a freqüência de acertos na ordenação da seqüência correta do processo de reparo usando radiografia convencional, imagem digitalizada e SDR foi de 37,3%; 31,4% e 31,4% respectivamente. Concluiu-se, portanto, que: (1) o processo de reparo de lesões periapicais pós-tratamento endodôntico pode ser avaliado quantitativamente por meio de análise longitudinal com SDR (2) qualquer uma das três ferramentas pode ser utilizada para quantificar o reparo, considerando que existe correlação entre o tempo de reparo e o aumento do valor de pixel; (3) a avaliação comparativa entre os métodos subjetivos, usando radiografia convencional, imagem digitalizada e a SDR, mostrou que todos foram capazes de evidenciar o processo de reparo de lesões periapicais desde a primeira radiografia (15 dias), não havendo diferença entre eles e (4) a avaliação quantitativa por meio de SDR conseguiu evidenciar o início do reparo com 15 dias após o início do tratamento endodôntico, embora esse reparo fosse realmente efetivo a partir de 105 dias após o início do tratamento endodôntico.

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48

Wang, S. Y., and 王士元. "Radiation Dose Evaluation with Dental Radiographies." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/06359768069273501642.

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碩士 國立陽明大學 放射醫學科學研究所 92 ABSTRACT Generally, radiation exposure from dental radiography is very trivial, especially followed by the newly developments in films and dental equipments. According to the US Food and Drug Administration (FDA) guidance, dental X-ray is a relatively low dose radiation, which is considered to be safe for clinical practice. However, all exposures due to ionizing radiation for medical and dental purposes could cause potential risks to both patients and staff. Besides these, leakage radiation increases unnecessary radiation doses as well. Radiation dose from dental radiography is highly variable depending on several factors: field of view (FOV), operating parameters (e.g., tube voltage, exposure time, and filter thickness, etc.), and types of the study (e.g., intraoral films, panoramic tomography, etc.). The aim of this study was to evaluate radiation doses from the following aspects: (1) verifying the operating parameters of dental x-ray units, (2) measurements of the leakage radiations, (3) assessments of the typical radiation dose of the staff and patients. Results were compared with respective standards recommended by the International Atomic Energy Agency (IAEA) and Atomic Energy Council (AEC) of Taiwan. In this study, the leakage radiation and output from dental x-ray radiographies were measured by utilizing a Barracuda multi-functional detector. For measuring the radiation dose from staff and patients, a Rando phantom and Thermoluminescent Dosimeter (TLD-100H) were used. The operating parameters of dental x-ray radiographies were evaluated and their results were provided. All of the results were compared with the current radiation regulation of AEC as shown in the parentheses. (1) Leakage radiation from x-ray units was 21.31 ± 15.24 mR/h (<100 mR/h). (2) The average filter thickness for x-ray machine was about 1.95 ± 0.3 mmAl (>1.5 mmAl). For panoramic x-ray machine, it was near 2.66 ± 0.11 mmAl (>2.5 mmAl). (3) Error of the actual tube voltage for the 60 kVp setting was from 0.2% to 6.5%, with an average of 2.5% (<7%). (4) The error of the exposure time for a 0.5~1.5 sec setting was within 0.7% to 8.5%, with an average of 7.3% (< 10%) error as well. (5) The average length of the x ray cone was 14.75 ± 0.5 cm, and the average target-to-skin distance was 18.63 ± 2.63 cm (>18 cm). (6) The diameter of the cone was 6 cm (<7.6 cm). The measured radiation dose from staff and patients during dental radiographies were shown as follows: (1) The annual equivalent dose of dentists and assistant staff were 1.44 ± 1.08 mSv /year and 2.04 ± 1.8 mSv/year, respectively (<50 mSv), (2). Patients dose of four different dental radiographic techniques were also assessed. Among these techniques, the highest effective dose was 55μSv and the lowest effective dose was only about 5μSv。 In conclusion, this study provides a systematic understanding of the current status of dental radiographies in dental clinics of Taiwan. This study also ensures that the doses to the medical staff and patients were considered reasonably low for clinical purposes. Results from this study might provide a valuable reference for future legislative considerations to associated regulation agencies of Taiwan.

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Yu, Jyun-De, and 余俊德. "Effective Classification Methods for Dental Radiographs and Dental Works." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/64410060456033013797.

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碩士 國立中興大學 資訊網路多媒體研究所 99 In recent years, identity recognition technology is widely used in daily life, such as: iris, fingerprints, voice prints, facial recognition ... and so on. Varieties of biological characteristics are quickly applied in control, transaction security, law enforcement and other related fields. However, in the field of the legal profession, victims and biological characteristics of the behavior are often damaged cause of major accidents. Teeth are the hardest body tissue that can resist high temperatures and strong impact. It is very suitable as a basis for identification of the victims. Because of traditional method of dental identification required to identify on a large database manually, it is a time consuming and ineffective approach. An automated dental identification system is proposed to find the best fit people by comparing dental radiographs of victims (post-mortem) and the dental radiographs on database are recorded before his death (ante-mortem). In addition, all kinds of dental work, including filling, crowns, implants ... and so on have different characteristic, it can be used as a basis for supporting the identity recognition. Therefore, this paper proposed two methods, one is a hierarchical feature extraction method of classifying dental radiographs effectively. The other is a morphological feature extraction of classifying dental work effectively. An automated dental identification system can be achieved by these effective classifications.

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50

Kuo, Chun-Hung, and 郭俊宏. "A study on dental work extraction and matching for dental radiographs." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/82330844919064726376.

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碩士 靜宜大學 資訊工程學系 99 We propose an effective dental work (DW) extraction method for uneven illumination dental radiographs and two DW matching methods: one for DW fully matching and one for DW partial matching. Through constraining edge-pixel’s intensity and edge length, we reduce most DW-contour irrelevant information first and then threshold the remaining pixels to retain coarse contours of DWs. Finally we obtain the complete shape of each DW by region growing. For DW fully matching, we adapt the method of Hofer et al. that uses number, position, size, and distance between two neighboring DWs as the matching features and add DW contour based on Fourier descriptors as an additional feature to resolve possible incorrect matching problem of Hofer et al.’s method when the database happens to contain imposter images with similar position, size and distance features but different shape of DWs. Because of later dental treatment, the number of DWs and the distance between two neighboring DWs could both be changed. Thus, we propose a partial matching method by discarding the matching cost of different number of DWs in the matching image pairs from the fully matching method and modifying the distance feature to be the distance between each DW and the most left DW. The method starts with finding the best shape-matching DW pairs between the query and each database image then computes the distance between two neighboring DWs by subtracting the values of the two neighboring DWs’ distance features. The experimental results show that our DW extraction method can effectively extract DW’s both in shapes and numbers. The experimental results also show that, for a database containing 29 pairs of matching and 51 non-matching dental radiographs, the accuracy of DW fully matching achieves 100% when using the top-1 retrieval. For a database containing nine pairs of matching and 31 non-matching dental radiographs, the accuracy of DW partial matching also achieves 100% when using the top-1 retrieval.

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