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Littérature scientifique sur le sujet « Teeth Roots »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 21 février 2023

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Articles de revues sur le sujet "Teeth Roots"

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Pansiera, Alberto Fritsch, et Nicolau Fonseca Milano. « Morfologia endodôntica dos segundos molares inferiores ». Revista da Faculdade de Odontologia de Porto Alegre 36, n^o 1 (21 juillet 2021) : 12–14. http://dx.doi.org/10.22456/2177-0018.111086.

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Considering that the second inferior molar is a tooth of large anatomic variation, we have proposed ourselves to anatyse some aspects of the internal and external morphology of its roots. The external morphology, 67,64% was visually evaluea, gathering the teet with differentiated, fused or single roots. The internal morphology was examinea after wear of mesial and distal roots to altow examination in the mesiodistalginge. One hundred and two teeth have been examined. As for the external morphology we found that 75,49% show differentiated roots, 18,62% fused roors and 5188% single roots. As for the internal morphology we found that 5,88% with one root canal 7,84% with two root canals, 67164% with three root canals and 18,62% with four root canals.

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Bokindo, Isaac Kipyator, Fawzia Butt et Francis Macigo. « Variant root morphology of third mandibular molar in normal and impacted teeth ». Anatomy Journal of Africa 6, n^o 3 (30 novembre 2017) : 1052–61. http://dx.doi.org/10.4314/aja.v6i3.163510.

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The mandibular third molar poses a challenge to dental surgeons due to it’s unpredictable morphology which leads to increased difficulty during its extraction. The root morphology of the third molar is considered to be the most variable in the human dentition. The study aims to document these variations which will be useful while undertaking procedures on the third molar. Three hundred and fifty nine panoramic views of the mandible were obtained from the Radiology division for patients seeking treatment in the School of Dental Sciences since 2010. The prevalence of third molar impaction was found to be 27%, with mesioangular being the commonest at 21.9% using the Winter’s classification. Dilacerations of roots was recorded at 44%, with a ratio of normal to dilacerated of 1:1 seen in impacted teeth while, non impacted teeth had a ratio of 1.3:1. Most teeth had 2 roots (85.5%), with one root seen in 12.1%. Partially fused roots was also observed in 2.4% of cases with only one case showing three roots. The total mean distance from the tips of roots to the mandibular canal was -0.5mm. Higher negative means of -1.5mm was recorded in impacted teeth than in normal teeth (-0.2mm). Teeth with dilacerated roots also showed closer proximity to mandibular canal than straight rooted teeth. The left side of the jaw also showed higher negative means. Present findings suggest that careful considerations should be made on impacted teeth. In addition to the type of impaction, proximity to the inferior alveolar nerve (IAN), number of roots and shape of the roots should be assessed. Similar considerations should also be made to non impacted teeth due to the high unpredictability observed in root morphology.Keywords: Third molar, root morphology, impaction

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Khattak, Munawar Aziz, Sana Arbab et Syed Amjad Shah. « Frequency of number of roots and root canals of maxillary first premolar teeth. » Professional Medical Journal 28, n^o 10 (30 septembre 2021) : 1513–18. http://dx.doi.org/10.29309/tpmj/2021.28.10.6290.

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Objective: To determine the frequency of the number of roots and root canals in a sample of 250 extracted maxillary first premolar teeth of patients visiting Peshawar Dental College and Hospital Khyber Pakhtunkhwa. Study Design: Cross Sectional. Setting: Department of Oral Biology, Peshawar Dental College and Hospital Khyber Pakhtunkhwa. Period: April 2016 to December 2016. Material & Methods: A total of 250 extracted human maxillary first premolars were collected from the Department of Oral & Maxillofacial Surgery, Peshawar Dental College, and Hospital Khyber Pakhtunkhwa. All teeth were visually inspected to count the number of roots. Subsequently, the access cavity was prepared, and pulp extirpated from each tooth. Endodontic explorer was used to locating the canal orifice(s) at the pulp chamber floor. Later the root canal orifices were injected with India ink to stain the canals. After that roots of teeth were sectioned at different levels to note down the number of canals. Data were analyzed using SPSS version 19. The statistical significance of the variations from mean values was considered significant if the p-value was less than 0.05. Results: Out of 250 maxillary first premolar teeth, 44.8% had one root, 40.4% had two separate and 12.8% had two fused roots. Three roots were seen in 2.0% teeth. Two root canals were present in the vast majority (70.4%), whereas one and three root canals were seen in 27.6% and 2.0% teeth, respectively. The correlation between the number of roots and root canals of maxillary first premolar teeth was highly significant. Conclusions: There was a high frequency of maxillary first premolars with two roots and two root canals.

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Arnbjerg, Jens. « Idiopathic Dental Root Replacement Resorption in Old Dogs ». Journal of Veterinary Dentistry 13, n^o 3 (septembre 1996) : 97–99. http://dx.doi.org/10.1177/089875649601300301.

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The roots of the teeth of 33 large dogs aged 10 years or older were radiographed. These dogs were euthanized for reasons other than oral diseases; dogs with obvious dental or periodontal diseases were excluded. The dogs had shown no clinical signs related to the teeth and the teeth were macroscopically normal. Of the 33 dogs, six had one or more teeth that had abnormally shaped and partially resorbed roots, with replacement of root structure by radiographically normal trabecular bone. Histological examination of radiographically abnormal roots revealed mid-root resorption, without signs of inflammation or hypercementosis. These findings are similar to the condition known as idiopathic dental root replacement resorption in the human dental literature. Possible etiologies of root resorption are discussed.

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Al-Ghananeem, Muna M. F., Khattar Haddadin, Abeer Salem Al-Khreisat, Moeen Al-Weshah et Nidal Al-Habahbeh. « The Number of Roots and Canals in the Maxillary Second Premolars in a Group of Jordanian Population ». International Journal of Dentistry 2014 (2014) : 1–4. http://dx.doi.org/10.1155/2014/797692.

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Objectives. The aim of this study was to investigate the number of roots and root canals in the maxillary second premolar in a group of Jordanian population.Materials and Methods. A total of 217 patients, 100 female (46%) and 117 male (54%), received root canal treatment of maxillary second premolar from January 2012 to January 2014. The mean age of the patients was 32.7, ranging from 18 to 60 years. The teeth included in the study were examined clinically and radiographically for the number of roots and root canals using magnifying loupes.Results. Out of the total of 217 maxillary second premolars, 120 teeth had one root (55.3%), 96 teeth had two roots (44.2%), and one tooth had three roots (0.46%). Regarding root canal configuration, 30 teeth (13.8%) had one canal, 54 teeth (24.9%) had two canals shared in one apical foramen, 132 teeth (60.8%) had two canals with two separate apical foramina, and one tooth (0.46%) had three canals with separate apical foramina.Conclusion. The incidence of two canals (either with shared or separate apical foramina) is very high in the maxillary second premolars in Jordanian population; therefore inspection should be done for the presence of second canal whenever endodontic treatment is planned for this tooth.

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Kim, Joon Hee, Hyuntae Kim, Teo Jeon Shin, Hong-Keun Hyun, Young-Jae Kim, Jung-Wook Kim, Ki-Taeg Jang et Ji-Soo Song. « Root and Canal Morphology of Maxillary Primary Molar using CBCT and 3D CT ». JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY 48, n^o 4 (30 novembre 2021) : 437–48. http://dx.doi.org/10.5933/jkapd.2021.48.4.437.

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The purpose of this study is to analyze morphological characteristics of maxillary primary molar’s root and root canal. 268 children aged 3 - 7 years (175 boys, 93 girls) who had CBCT (152 children) and 3D CT (116 children) taken in Seoul National University Dental Hospital from January 2006 to April 2020 were included. The number of roots and root canals were analyzed in 1002 teeth without any root resorption or periapical pathologies. Curvature, angulation, length of root and root canal, as well as cross-sectional shapes of the root canal were analyzed in 218 teeth. By using Mimics and 3-Matics software, volume, surface area, and volume ratio of root canal was analyzed in 48 teeth. More than half of maxillary primary molars have 3 roots and 3 root canals. The degree of symmetry of root canal type was about 0.63 (Cohen’s kappa coefficient). The most frequent shape of roots and canals was linear in 1st primary molars and curved in 2nd primary molars. Angulation, length of root and root canals was the largest on palatal roots. Most teeth showed ovoid or round shapes at apex. The largest root canal volume, surface area, volume ratio was found in the palatal roots.

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Siddiq, Maimoona, Junaid Shakeel, Bushra Naeem Khan, Syed Zuhair Mehdi, Shoaib Hameed et Farooq Ahmad Chaudhary. « Root morphology of maxillary 1st premolar teeth in orthodontic extraction cases presenting in a tertiary care hospital : Taxilla Cantt. » Professional Medical Journal 28, n^o 7 (1 juillet 2021) : 1013–17. http://dx.doi.org/10.29309/tpmj/2021.28.07.6209.

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Objective: To observe pattern and variation of root morphology of maxillary 1st premolar teeth in orthodontic extraction cases among local population. Study Design: Prospective Observational study. Setting: Dental College-HITEC Institute of Medical Sciences-Taxilla Cantt. Period: 1st January 2017 to 31st December 2019. Material & Methods: A total of 120 patients and 320 maxillary 1st premolars were studied clinically for gross root morphology after orthodontic tooth extraction, variation of gross root morphology was studied among extracted teeth, frequency distribution was observed on basis of gender and both quadrants in each patient, a critical analysis is also made about variation of root morphology among various populations across the world. Result: Out of 160 patients, 49 were males and 111 were females. 151 patients had bilateral similar root morphology, out of 320 clinically examined teeth 206 had two roots, and 123 teeth had fused root morphology, 83 teeth had two bifurcated (separate) roots while 114 teeth were single rooted. Conclusion: Maxillary 1st premolar is unique in terms of wide variation in root morphology which is evident among various population studies. Two roots with fused root morphology is most prevalent in Pakistani population.

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Khattak, Imran, Munawar Aziz Khattak, Yusra Jamil Khattak, Sana Arbab, Momena Rashid et Syed Amjad Shah. « USE OF TOOTH CLEARING TECHNIQUE TO DETERMINE ROOT AND CANAL MORPHOLOGY OF PERMANENT MANDIBULAR THIRD MOLARS IN POPULATION OF PESHAWAR : AN IN VITRO CROSS-SECTIONAL STUDY ». KHYBER MEDICAL UNIVERSITY JOURNAL 14, n^o 4 (31 décembre 2021) : 216–21. http://dx.doi.org/10.35845/kmuj.2021.21653.

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OBJECTIVE: To find out number of roots, root-canals and canal configuration in permanent mandibular third molars through tooth clearing technique. METHODS: In this cross-sectional study, 193 extracted human mandibular permanent third molars with completely formed apical foramen and intact roots were collected from both genders treated at dental hospitals in Peshawar, Pakistan from 1st July to 31st December 2019. After collection teeth were visually inspected to count number of roots, followed by access cavity preparation, pulp extirpation and canal staining with black Indian ink. Decalcification was done by placing teeth in nitric acid for 5 days followed by dehydration in ascending concentrations of alcohol. Complete transparency was achieved by immersing teeth in methyl-salicylate for 72 hours. Transparent teeth were inspected again for number of roots and root-canals. RESULTS: Among 193 extracted mandibular third molars, (n=161; 83.4%) had two-roots and (n=24; 12.4%) were single-rooted. Two-canals were present in vast majority (n=142; 73.6%) whereas three and one-canal were seen in (n=37; 19.2%) and (n=13; 6.7%) teeth respectively. Most common type of root canal pattern was Vertucci’s Type-I in mesial-roots (n=79; 63.7%) and distal-roots (n=120; 96.8%). Vertucci’s Type-II and Type-IV were (n=15; 12.1%) and (n=12; 9.7%) in the mesial-roots respectively. Mandibular third molars didn’t present with any configurations that didn’t fullfill Vertucci’s criteria. Correlation between number of roots and root-canals of mandibular third molars was non-significant. CONCLUSION: Two-roots and two-canals were common patterns for mandibular third molars. Mesial and distal roots were predominant in Type-I followed by Type-II and Type-IV Vertucci’s classification.

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Jafarzadeh, Hamid, Zahed Mohammadi et Sousan Shalavi. « Extra Roots and Root Canals in Premolar and Molar Teeth : Review of an Endodontic Challenge ». Journal of Contemporary Dental Practice 14, n^o 5 (2013) : 980–86. http://dx.doi.org/10.5005/jp-journals-10024-1437.

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ABSTRACT The main goal of endodontic treatment is healing of the periapical tissues which are gained by elimination of bacteria and their byproducts from the canal and prevention from reinfection. Understanding of root canal anatomy is an essential part in endodontic treatment. Anatomic forms and variations in special teeth should be well known, one of them is extra roots/ canals. Although possible aberrations of canal anatomy should be considered for all teeth, some teeth should be highlighted. This review addresses the prevalence, diagnosis (clinical and radiographic), and endodontic management of teeth with extra roots/canals. How to cite this article Mohammadi Z, Shalavi S, Jafarzadeh H. Extra Roots and Root Canals in Premolar and Molar Teeth: Review of an Endodontic Challenge J Contemp Dent Pract 2013;14(5):980-986.

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Angerame, Daniele, Matteo De Biasi, Massimiliano Lenhardt, Lorenzo Bevilacqua et Vittorio Franco. « Survival study on teeth after successful endodontic surgical retreatment : influence of crown height, root length, crown-to-root ratio and tooth type ». Giornale Italiano di Endodonzia 32, n^o 2 (20 février 2019) : 63–69. http://dx.doi.org/10.4081/j.gien.2018.4.

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Aim: To assess the influence of the crown height, root length, crown-to-root ratio, and tooth type on the survival of teeth subjected to surgical endodontic retreatment and classified as periapically healed. Methodology: A single operator performed endodontic microsurgery interventions between 2008 and 2018 on teeth with refractory apical periodontitis. The present analysis selected the teeth classified as ‘‘complete periapical healing’’ according to the scale suggested by Molven. The postoperative periapical radiographs and those taken at the last recall visit were analysed by two independent calibrated examiners, who measured crown height and root length in a blind manner. The crown-to-root ratio was calculated as the ratio of the two variables. The level of inter- and intra-operator agreement was tested with Bland—Altman plots with 95% limits of agreement. An independent statistician conducted a survival analysis using Kaplan—Meier plots and a log-rank test (a = 0.05) to assess the significance of the differences among the subgroups defined by the following criteria: (a) crown height median; (b) root length median; (c) crown-to-root ratio <1 vs. >1; (d) crown-to-root ratio median; (e) single-rooted teeth vs. multi-rooted teeth. Results: At the end of the analysis, 42 patients were evaluated, each one contributing to the study with a single tooth. The mean follow-up period was 4.2 2.4 years. Survival estimates were significantly improved for the teeth with roots longer than 8 mm, in comparison with that with shorter roots ( p < 0.05). There were no statistically significant differences among the remaining considered subgroups. Conclusions: Under the conditions of this retrospective study, teeth with longer residual roots after apical surgery exhibited better chances of survival when compared to teeth with roots shorter than 8 mm. The other considered variables did not seem to affect the survival of apically resected teeth.

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Thèses sur le sujet "Teeth Roots"

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Walker, Richard Thomas. « A comparative investigation of the root number and canal anatomy of permanent teeth in a Southern Chinese population ». Thesis, [Hong Kong : University of Hong Kong], 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12335423.

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Wu, Andy Tzong Jong. « The extent of root resorption following the application of light (25g) and heavy (225g) controlled rotational orthodontic forces for 4 weeks : a micro-CT study ». Thesis, The University of Sydney, 2009. https://hdl.handle.net/2123/28194.

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In 1932 Beck and Marshall defined root resorption as the destruction of formed tooth structure. Root resorption results in the loss of substance from dentine or cementum and can present as either a physiological or pathological process. Physiological root resorption can occur in both deciduous and permanent dentition. Root resorption of the deciduous dentition is a normal and essential physiological process that facilitates natural exfoliation. Pathological resorption is an inflammatory process that is triggered by numerous factors. Root resorption following orthodontic treatment is intimately associated with the biological processes that occur during tooth movement. To date, the mechanism of orthodontically induced inflammatory root resorption (henceforth referred to as OIIRR) has not been fully understood. The pathological process is related to local injury of the periodontal ligament associated with the removal of hyalinised tissue. This process has been found to take place when local areas of the periodontal ligament are overcompressed. The phenomenon is widely known as OIIRR and is often unpredictable; it is an inevitable pathological consequence of orthodontic tooth movement that compromises the success of orthodontic treatment. The incidence of OIIRR ranges from 73% to 100% in recent studies} and its prevalence has been shown to increase with orthodontic treatment. Experimental research concludes that all human teeth develop resorption lacunae on the pressure side of the root surface shortly after application of orthodontic forces.

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Malek, Sameh. « Physical properties of human premolar cementum : a structural correlation ». Thesis, The University of Sydney, 2000. http://hdl.handle.net/2123/4696.

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Ngan, Daniel C. S. « The genetic contribution to orthodontic root resorption : a retrospective twin study ». Thesis, The University of Sydney, 2003. http://hdl.handle.net/2123/4781.

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Rizgar, Shahyan. « The Crisis of Identity in a Multicultural Society : A Multicultural Reading of Zadie Smith’s White Teeth ». Thesis, Södertörns högskola, Institutionen för kultur och lärande, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-30710.

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This essay, on Zadie Smith’s White Teeth, deals with the characters’ identities and the influences of multiculturalism on their complex identities. It also discusses the role of the characters roots and history in constructing their identities and how they have made life problematic for the characters in multicultural London. The roots and history of the first generation of immigrants make problematic identities for the second generation in the novel. The main aim of this essay is to demonstrate the instability of identity as depicted in the novel. The characters in the novel cannot ‘’plan’’ their identities because it is a process which continues in all stages of life. Though the first generation of immigrants want to ‘’plan’’ an identity for their children (the second generation of immigrants), they are not successful. Because identity is a process and it is changeable based on place and time. The second generation of immigrants, who live in London, tries to mix the dominant culture (English culture) with their familial culture in order to have a different identity. They also want to escape from their family’s roots and history but it is difficult, because leaving roots is not an easy process.

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Dreyer, Craig William. « Clast cell activity in a model of aseptic root resorption ». Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phd778.pdf.

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Mei, Lei, et 梅蕾. « Actions of chlorhexidine and silver diamine fluoride on cariogenic biofilm and root caries ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44900776.

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Soares, Paulo Vinicius. « Analise do complexo tensão-deformação e mecanismo de falha de pre-molares superiores com diferentes morfologias radiculares e redução sequencial de estrutura dental ». [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289706.

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Orientador: Luis Roberto Marcondes Martins
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-12T16:07:44Z (GMT). No. of bitstreams: 1 Soares_PauloVinicius_D.pdf: 5664940 bytes, checksum: 5369a8b869a42ab6387fca630f988a4c (MD5) Previous issue date: 2008
Resumo: Este trabalho tem avaliou o comportamento biomecânico de pré-molares superiores humanos por meio de análise da distribuição de tensões, deformação da estrutura dental e resistência à fratura, variando a morfologia radicular e o tipo de preparo cavitário. Foram selecionados 40 pré-molares superiores com dimensões coronárias semelhantes, distribuídos em 4 categorias de morfologia radicular diferentes (n=10): Uni - uniradiculares; FA - biradiculares com furca presente no terço apical da raiz; FM- biradiculares com furca presente no terço médio da raiz; FC - biradiculares com furca presente no terço cervical da raiz. Cada dente recebeu sete tipos seqüenciais de remoção de estrutura: H-hígido (controle), O- oclusal; OD- disto-oclusal, MOD- mésio-ocluso-distal, MOD+Aacesso endodôntico, TE- tratamento endodôntico e RC- restauração com resina composta. O comportamento biomecânico dos dentes foi analisado de forma comparativa entre diferentes metodologias: 1) simulação computacional para análise da distribuição de tensões (método de elementos finitos), 2) ensaio laboratorial não-destrutivo para análise das deformações (método de extensometria) e 3) ensaio laboratorial destrutivo para análise da resistência a fratura (método de resistência à fratura), além da realização da classificação do padrão de fratura. Observou-se que a remoção de estrutura dental favoreceu maior acúmulo de tensões e deformação. O tipo de morfologia radicular influenciou no padrão de deformação de cúspide e face proximal, sendo a furca cervical o fator mais importante no aumento dos valores de deformação. A furca presente no terço cervical e sulcos profundos das faces proximais promoveram maior incidência de fraturas severas. Observou-se também correlação direta dos resultados encontrados nos diferentes métodos empregados.
Abstract: The aim of this work was to evaluate the biomechanical behavior of restored maxillary human premolar throughout stress-strain, stress distribtion analysis and fracture resistance with different root morphologies and the cavity preparation design. Forty maxillary premolars with similar coronary dimensions were selected and divided into 4 morphology categories (n=10): Uni- single rooted; Fabiradicular premolar with apical furcation; FM- biradicular premolar with medium furcation; FC- biradicular premolar with cervical furcation. Each tooth received seven treatments with structural reduction: H- sound tooth (control group), Ooclusal cavity; OD- disto-occlusal cavity; MOD- mesio-occlusal-distal cavity; MOD+A- endodontic access; TE- endodontic tretment; RC- restoration with composite resin. The biomechanical behavior of the teeth was analyzed by methodologies association: 1)Finite Element Analysis, 2) Strain-gauge method and 3) Fracture resistance test and Failure mode), and was made the fracture mode classification. It was observed that dental structure loss promotes high stress concentration inside the teeth and cuspal deflection. The root morphology influenced cusp and proximal surface strain. The cervical furcation was the main factor of strain data increase. This study showed that the association of different methodologies is an important tool for biomechanical analysis.
Doutorado
Dentística
Doutor em Clínica Odontológica

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Carey, Helen. « Debridement Of Subgingival Periodontally Involved Root Surfaces With A Micro-Applicator Brush : A Macroscopic And Scanning Electron Microscope Study ». University of Sydney, 1998. http://hdl.handle.net/2123/4957.

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Master of Science in Dentistry
This work was digitised and made available on open access by the University of Sydney, Faculty of Dentistry and Sydney eScholarship . It may only be used for the purposes of research and study. Where possible, the Faculty will try to notify the author of this work. If you have any inquiries or issues regarding this work being made available please contact the Sydney eScholarship Repository Coordinator - ses@library.usyd.edu.au

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Cavassim, Rodrigo [UNESP]. « Avaliação da descontaminação com ácido cítrico e tetraciclina e da rugosidade, na adesão de coágulo a superfícies radiculares submetidas a diferentes tipos de instrumentação ». Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/104726.

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Made available in DSpace on 2014-06-11T19:33:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-03-22Bitstream added on 2014-06-13T20:25:02Z : No. of bitstreams: 1 cavassim_r_dr_arafo.pdf: 4752194 bytes, checksum: dce6b5a310de662c347f9a2267e4dbb2 (MD5)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O tratamento periodontal engloba o processo de raspagem e alisamento radicular, podendo ser realizado por diferentes meios que além de remover o cálculo dental, produzem diferentes características na superfície radicular como ranhuras e concavidades e também a formação de smear layer. O uso de agentes químicos é proposto na literatura para remover essa smear layer, e descontaminar a superfície radicular, aumentando assim as chances de formação de nova inserção conjuntiva. O objetivo do Estudo 1 foi avaliar, por meio de microscopia eletrônica de varredura, a influência de diferentes concentrações, modos e tempos de aplicação de ácido cítrico na biomodificação de superfícies radiculares submetidas à raspagem e alisamento radicular. Neste estudo, 270 amostras foram divididas em 6 grupos (45 amostras/grupo): soro fisiológico (controle), ácido cítrico (0.5%, 1%, 2%, 15% e 25%), com tempos de 1, 2 ou 3 minutos para cada grupo, nos modos de aplicação: a) aplicação passiva (bolinha de algodão); b) fricção suave (pincel); c) fricção vigorosa (bolinha de algodão), com renovação da solução a cada 30 segundos. As amostras foram submetidas à desidratação em concentrações crescentes de álcool etílico e HMDS, sendo em seguidas metalizadas e levadas para observação em microscopia eletrônica de varredura. Um examinador treinado, calibrado (kappa=0,93) e cego avaliou as fotomicrografias obtidas. A análise estatística foi realizada utilizando-se os testes de Kruskal- Wallis e Dunn. No estudo 2, investigou-se a influência da biomodificação radicular associada a diferentes meios de instrumentação na adesão de coágulo e elementos sanguíneos. Cento e cinquenta dentes afetados periodontalmente foram divididos em 5 grupos: Grupo I, instrumentação com curetas; Grupo II, instrumentação com curetas removendo cálculo superficial; Grupo III, remoção...
Periodontal treatment encompasses the scaling and root planning process and can therefore be carried out by various means. In addition to removing dental calculus, the root instrumentation produces different characteristics in the radicular surface as the formation of concavities and smear layer. The use of chemical agents is proposed in the literature to remove the smear layer, and detoxify the radicular surface, thereby increasing the chances of forming new connective attachment. The aim of the Study 1 was to assess, through scanning electron microscopy, the influence of different concentrations, application methods and application times of citric acid in the root conditioning after scaling and root planning. Two hundred seventy (270) samples were equally divided into six groups (n=45) for treatment with saline solution (control) and five different concentrations of citric acid (0.5, 1, 2, 15, and 25 percent). Three acid application methods were used (passive, brushing, and burnishing) as well as three application periods (1, 2, and 3 minutes). A previously trained, calibrated (kappa score = 0.93), and blind examiner subsequently scored scanning electron micrographs (SEMs) of the samples. Statistical analyses were performed by using Kruskal-Wallis and Dunn’s post-hoc tests. In Study 2, was investigated the influence of root conditioning associated with different modes of instrumentation in the adhesion of clot and blood elements. One hundred and fifty periodontally affected teeth were divided into five groups: Group I, instrumentation with curettes; Group II, instrumentation with curettes removing the superficial calculus; Group III, ultrasonic scaler with removal of the superficial calculus; Group IV, ultrasonic scaler for removal of the superficial calculus and after that, instrumentation with curettes; Group V, calculus surface. These five groups were further divided... (Complete abstract click electronic access below)

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Livres sur le sujet "Teeth Roots"

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Kulacz, Robert. The roots of disease : Connecting dentistry and medicine. [Philadelphia] : Xlibris Corp., 2002.

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Root scaling and planing : A fundamental therapy. Chicago : Quintessence Pub. Co., 1986.

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Arens, Donald E. Practical lessons in endodontic surgery. Chicago : Quintessence Pub. Co., 1998.

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Kvist, Thomas, dir. Apical Periodontitis in Root-Filled Teeth. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57250-5.

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Perdigão, Jorge, dir. Restoration of Root Canal-Treated Teeth. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-15401-5.

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Treatment planning for traumatized teeth. 2^e éd. Hanover Park, IL : Quintessence Pub. Co., 2012.

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author, Levy Thomas E., dir. The toxic tooth : How a root canal could be making you sick. Henderson, NV : MedFox Publishing, 2014.

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Pederson, E. D. Effect of root-surface modification of human teeth on adherence of fibronectin. Great Lake, Ill : Naval Dental Research Institute, 1989.

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Contemporary restoration of endodontically treated teeth : Evidence-based diagnosis and treatment planning. Hanover Park, IL : Quintessence Pub., 2012.

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RoManSy (10th 1994 Gdańsk, Poland). Theory and practice of robots and manipulators : Proceedings of RoManSy 10 : the Tenth CISM-IFToMM Symposium. Wien : Springer Verlag, 1995.

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Chapitres de livres sur le sujet "Teeth Roots"

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Becker, Adrian. « Impacted Teeth and Resorption of the Roots of Adjacent Teeth ». Dans Orthodontic Treatment of Impacted Teeth, 173–210. West Sussex, UK : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118709641.ch7.

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Nibali, Luigi. « Deep Gaps between the Roots of the Molars ». Dans Diagnosis and Treatment of Furcation-Involved Teeth, 249–56. Chichester, UK : John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119270638.ch13.

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Bosiakov, Sergey, Kirill Yurkevich et Andrey Dosta. « The calculation of teeth roots displacement which appears during orthodontical treatment ». Dans IFMBE Proceedings, 209–11. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03891-4_56.

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Deleat-Besson, Romain, Celia Le, Winston Zhang, Najla Al Turkestani, Lucia Cevidanes, Jonas Bianchi, Antonio Ruellas et al. « Merging and Annotating Teeth and Roots from Automated Segmentation of Multimodal Images ». Dans Multimodal Learning for Clinical Decision Support, 81–92. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89847-2_8.

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Sameshima, Glenn T. « Resorption of Impacted Teeth ». Dans Clinical Management of Orthodontic Root Resorption, 125–35. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58706-2_10.

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Kvist, Thomas. « Introduction ». Dans Apical Periodontitis in Root-Filled Teeth, 1–6. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57250-5_1.

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Holmberg, Pernilla. « Alternatives : Extraction and Tooth Replacement ». Dans Apical Periodontitis in Root-Filled Teeth, 117–32. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57250-5_10.

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Frisk, Fredrik. « Incidence, Frequency, and Prevalence ». Dans Apical Periodontitis in Root-Filled Teeth, 7–19. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57250-5_2.

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Chávez de Paz, Luis E. « Aetiology of Persistent Endodontic Infections in Root-Filled Teeth ». Dans Apical Periodontitis in Root-Filled Teeth, 21–32. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57250-5_3.

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Frisk, Fredrik, et Thomas Kvist. « Consequences ». Dans Apical Periodontitis in Root-Filled Teeth, 33–42. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57250-5_4.

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Actes de conférences sur le sujet "Teeth Roots"

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Alwan, Merriam Ghadhanfar, Gires Usup, Lee Yook Heng et Asmat Ahmad. « Biofilm forming ability of bacteria isolated from necrotic roots canals of teeth ». Dans THE 2017 UKM FST POSTGRADUATE COLLOQUIUM : Proceedings of the University Kebangsaan Malaysia, Faculty of Science and Technology 2017 Postgraduate Colloquium. Author(s), 2018. http://dx.doi.org/10.1063/1.5027993.

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Setas, Sara, Eurico Seabra, Luis F. Silva, Helder Puga, Catia Pombo et Joaquim Gabriel Mendes. « Implementation of a multivibrational medical device to assist the removal of teeth and roots ». Dans 2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG). IEEE, 2015. http://dx.doi.org/10.1109/enbeng.2015.7088841.

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Sanders, Aaron, Donald R. Houser, Ahmet Kahraman, Jonny Harianto et Sam Shon. « An Experimental Investigation of the Effect of Tooth Asymmetry and Tooth Root Shape on Root Stresses and Single Tooth Bending Fatigue Life of Gear Teeth ». Dans ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48303.

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In this paper, effects of root fillet geometry and tooth asymmetry on tooth bending stresses and fatigue lives of spur gears are investigated. For this purpose, an existing gear analysis model, the Load Distribution Program (LDP), is employed to define four basic tooth geometry variations. These four variations are (i) symmetric tooth profiles (i.e. identical loaded and unloaded flanks) with full circular root geometry (at the maximum radius possible), (ii) symmetric tooth profiles with an elliptical root geometry, (iii) asymmetric tooth profiles (i.e. loaded and unloaded flanks at different pressure angles) with full circular root geometries, and (iv) asymmetric tooth profiles with an elliptical root geometry on the right (loaded) flank and a circular root geometry on the left flank. Under these conditions, variations (ii), (iii), and (iv) are predicted to have maximum root stresses that are 7.6%, 22.4%, and 24.3% less than that of the baseline case (i). Actual test articles representing these four variations were qualified through dimensional measurements of the profiles and the root fillet regions. The roots of several of the teeth of each gear type were instrumented and strain measurements under various tooth load levels are compared with the predictions. Single tooth bending fatigue tests were also performed to obtain fatigue data for each variation of the test gears. The resultant tooth bending fatigue performance of each gear variation is shown to correlate with the level of root stress reduction achieved. Experiments indicate that the most significant life increases compared to the baseline conditions are achieved with the last variation (asymmetric tooth profiles and an elliptical root shape), where the mean life is increased by more than 30 times. It is also shown through examination of the broken teeth that the critical locations where the cracks initiated agree well with the predicted locations of the maximum root stresses.

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Barone, Sandro, Alessandro Paoli, Armando V. Razionale et Roberto Savignano. « 3D Reconstruction of Individual Tooth Shapes by Integrating Dental CAD Templates and Patient-Specific Anatomy ». Dans ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34362.

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The accurate reconstruction of a human digital dental model represents a wide research area within the orthodontic field due to its importance for the customization of patient treatments. Usually, 3-D dental root geometries are obtained by segmenting tomographic data. However, concerns about radiation doses may be raised since tomographic scans produce a greater X-ray dose than conventional 2-D panoramic radiographs (PAN). The present work is aimed at investigating the possibility to retrieve 3-D shape of individual teeth by exposing the patient to the minimum radiation dose. The proposed methodology is based on adapting general CAD templates over patient-specific dental anatomy, which is reconstructed by integrating the optical digitization of dental plaster models with a PAN image. The radiographic capturing process is simulated through the Discrete Radon Transform (DRT) and performed onto the patient crowns geometry obtained by segmenting the digital plaster model. A synthetic PAN image is then reconstructed and used to integrate the radiographic data within the digitized plaster model, thus allowing to retrieve roots information which guide the CAD templates adapting over the patient anatomy.

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Johannesson, Tomas. « Detection of Land Area Wear in Automotive Synchronous Belts ». Dans ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48021.

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A common way of driving the camshafts of an internal combustion engine is by synchronous belt. One of the major drawbacks is their limited durability. Several failure modes may appear. This paper considers land area wear failures. The area between two teeth on a synchronous belt is called the land area. Most of the semicircular belt profiles, used in automotive cambelt drives today, have a small backlash, i.e. the pulley groove is a little wider than the belt tooth. This allows for a relative motion between belt and pulley teeth. In a cambelt drive, in which torques are oscillating, this is the case. The movement causes wear to the land area that eventually will lead to breakage of the facing fabric, forcing the belt-pulley contact to run on the belt cord which will quickly lead to belt failure. This paper describes a method to detect the wear of land areas of synchronous belts. From surface topology measurements of the land areas at different wear stages, well-known roughness parameters are used to determine the degree of wear. The roughness parameters variations are explained by a physical wear procedure. In addition to this formerly known land area wear originating from complete meshing, another wear mechanism was discovered present near the tooth roots. The newly discovered land area wear type can be explained by seating and unseating effects.

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Lin, Jianping, Om A. Sharma et Wooram Park. « Dynamic Analysis for Motor-Powered Periotomes in Dentistry ». Dans ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88196.

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A periotome is a hand-held manual instrument that dentists use during tooth extraction. Using the sharp blade at the tool tip, dentists cut the periodontal ligaments that bonds the alveolar bone and the cementum surrounding the roots of teeth. Since this procedure usually requires dentists to repeatedly apply a certain level of force on the hand-held tool during the long-time procedure, it leads to dentists’ fatigue on their hands, inaccurate hand motion, and patients’ discomfort. Motorized periotomes can significantly improve the tooth extraction procedure by decreasing the force required from a dentist and reducing the procedure time. In this paper, we consider simple designs for motor-powered periotomes focusing on dynamic behaviors. Since the motor inside the tool creates motion and the hand-held tool moves as a result of dynamic response, the analysis requires detailed consideration of many factors such as tool mass, hand stiffness and damping. The motion of the tool tip should be monitored in this analysis to maximize the cutting performance. The analysis results will be used for choosing design options and parameters. This approach will be demonstrated using dynamic modeling and computer simulations.

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Putchkov, Igor, Alexander Arkhipov, Valery Moskovskikh, Harald Kissel et Alexander Laqua. « Particularities of Blading Free Resonance Design for Heavy Duty Gas Turbines With Circumferential Rotor Grooves ». Dans ASME Turbo Expo 2014 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26853.

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Blades for heavy duty engines with circumferential rotor grooves are designed such that radial contact is made between the blade teeth and rotor groove at steady state operation conditions. However, sometimes circumferential contact arises between neighboring blade shanks, which is often caused by blade root /rotor thermal expansion. In this case, the radial fixation will give the lower limit of blade frequency band, and the circumferential will give the upper one. The Blade frequency difference between these two fixations might reach about 200–500 Hz depending on blade airfoil and root sizes. When some excitation source (e.g., vane passing frequencies caused by up-stream and down-stream vane counts) has a frequency level situated between blade frequencies caused by radial and circumferential contact, such a case is the subject of the proposed approach. In order to assess how strongly the blade might be fixed under different conditions and how long it might be in resonance during engine start-up and subsequent loading, a 3D elastic-plastic transient analysis and corresponding frequency calculation of blade/rotor assembly is used. At engine start-up the circumferential (lateral) contact between neighboring blade roots is insignificant, and the radial contact between the rotor and the blade is dominant. The lateral contact spot between neighboring blade attachments during start-up appears due to different rates of blade/rotor heating. Further heating leads to an increase of the lateral contact spot areas. The closing of these contact surfaces starts from the outer root edge and spreads toward the inner one, leading to an increase of assembly natural frequencies. Engine loading and further heating lead to the appearance of a circumferential gap between the surfaces, causing the lateral contact to disappear during steady state. The blade root coupling switches again to the usual radial contact state, with the corresponding reduction of natural frequencies. Because the described phenomenon might occur for some time during every start-up and shut-down (from several minutes to couple of hours), it becomes even more severe from a dynamics standpoint if some natural frequency of coupled system crosses the exciting frequency. Examples of assembly frequency tuning are presented.

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Zhou, Changjiang, Jinyuan Tang et Zhihua Zhong. « Research on Superimposed Effect of Root Stresses and Teeth Compliance Considering Multi-Teeth Meshing ». Dans ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35016.

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Based on gear engagement principle, the exact curve of tooth profile is produced. By the method for compositing and modeling with MATLAB and APDL, the precise FEM model of gear is built, considering major factors of effecting root stresses and teeth compliance. Comprehensive stiffness including bending and contact stiffness is calculated during one meshing cycle. The load sharing ratio of an appointed tooth is reached, the equations of load-hist along line of action are deduced. Considering superimposed effect of engaging force in multi-teeth meshing zone, regularities of distribution of root stresses and teeth compliance in a normal meshing cycle are get. The results show that stress superimposed effect caused by adjacent meshing tooth influences compression side of the tooth is more than tension one, and makes the maximum deflection of the appointed tooth bigger. Finally, the results developed by authors show reliable, in comparison with the ones given according to authoritative methods.

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Zhang, Yuan, Ruogu Qian, Yan Tian et Zhenlin Ge. « Research progress of short root teeth in invisible orthodontics ». Dans INTERNATIONAL SYMPOSIUM ON THE FRONTIERS OF BIOTECHNOLOGY AND BIOENGINEERING (FBB 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5110840.

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Dong, J., et H. Everett. « The Development of Endodontic Micro Robot ». Dans ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41562.

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Endodontic therapy, better known as root canal treatment, is a procedure performed to remove damaged and/or infected tissue from the inner canals of teeth and seal the canals to prevent the teeth from being a source of infection. Each year more than 24 million teeth receive endodontic treatment in the United States. A typical procedure includes access preparation (opening crown with drills), root canal shaping and cleaning, and then root canal filling. This treatment is expensive, time-consuming, and prone to human error. The outcome relies on the clinician’s skill, which is gained through years of training and practice. The success quotient of this treatment is 60–65% for general dentists and 90% for specialists (endodontists). There is a need for advanced endodontic technology innovation. This paper will describe the process of mechanical design of computer-controlled micro machine, which will perform the automatic probing, drilling, cleaning, and filling of the root canal. The paper will also discuss the innovations involved from the traditional way endodonticsts treat root canal to science and technology based automation.

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Rapports d'organisations sur le sujet "Teeth Roots"

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Tan, Li, Qiong Liu, Yun Chen, Ya-Qiong Zhao, Jie Zhao, Marie Aimee Dusenge, Yao Feng et al. Efficacy of sonic activation techniques on tubular dentin sealer penetration：A systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, juillet 2022. http://dx.doi.org/10.37766/inplasy2022.7.0116.

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Review question / Objective: Is sonic activation techniques more effective than conventional needle irrigation for the tubular dentin sealer penetration. The included study was a randomized controlled trial. Eligibility criteria: A comprehensive search was conducted for all published studies evaluating efficacy of percentage and maximum depth of sealer penetration, following the use of SI and standardized irrigants (NaOCl and EDTA). Because this can hardly be measured clinically, only confocal laser scanning microscopy (CLSM) studies were selected owing to wide use of this methodology for evaluating tubular dentin sealer penetration. The studies using previously filled roots or animal teeth, artificial debris, and plastic blocks, and studies measuring the penetration of tubular dentin sealers in lateral root canals, isthmus, or artificial grooves were excluded to maintain the standardized sample selecting and measuring (Virdee et al. 2018). The search was limited to articles published between January 2000 and June 2022 to ensure conclusions were drawn from contemporary data. There are no language restrictions on filtering articles to ensure the integrity of included data.

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Karteva, Ekaterina, Neshka Manchorova, Zhelyazko Damyanov, Ognyan Petrov et Stoyan Vladimirov. Crystallite Size of Crown and Root Dentin from Vital and Endodontically Treated Teeth. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, septembre 2021. http://dx.doi.org/10.7546/crabs.2021.09.17.

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Xie, Yirui, Yao Lin, Junbing He et Furong Lu. Revascularization Versus Apexification for the Treatment of Immature Necrotic Teeth based on periapical healing and root development outcomes：a systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, septembre 2020. http://dx.doi.org/10.37766/inplasy2020.9.0013.

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