Academic literature on the topic 'Maxillary premolar'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Maxillary premolar.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Maxillary premolar":
1
Bittegeko, SB, J. Arnbjerg, R. Nkya, and A. Tevik. "Multiple dental developmental abnormalities following canine distemper infection." Journal of the American Animal Hospital Association 31, no. 1 (January 1, 1995): 42–45. http://dx.doi.org/10.5326/15473317-31-1-42.
Abstract:
Multiple dental developmental abnormalities (e.g., dental impaction, partial eruption, oligodontia, enamel hypoplasia, and dentin hypoplasia) in a 10-month-old, female, Tanzanian tropical mixed-breed puppy are reported. Various permanent teeth were involved. These included impacted mandibular canine and first and third premolar teeth; a partially erupted maxillary canine tooth; oligodontia of a mandibular fourth premolar tooth; enamel hypoplasia of the maxillary and mandibular canine teeth, incisors, and premolars; and dentin hypoplasia of the maxillary incisors, maxillary premolars, and mandibular premolars. The puppy had clinical canine distemper at the age of two months and had no history of any other systemic nor generalized infection prior to the time when the dental abnormalities were observed.
2
Bulut, Duygu Goller, Emre Kose, Gozde Ozcan, Ahmet Ercan Sekerci, Emin Murat Canger, and Yıldıray Sisman. "Evaluation of root morphology and root canal configuration of premolars in the Turkish individuals using cone beam computed tomography." European Journal of Dentistry 09, no. 04 (October 2015): 551–57. http://dx.doi.org/10.4103/1305-7456.172624.
Abstract:
ABSTRACT Objective: The aim of the present study is to assess the root and root canal morphology of maxillary and mandibular premolars in a Turkish population by using cone beam computed tomography (CBCT). Materials and Methods: In this study, CBCT images of 2134 premolars (987 maxillary, 1147 mandibular) were obtained from 404 patients. Details of gender, age, number of roots and canals, and canal configuration in each root were recorded. The canal configuration was classified and evaluated according to Vertucci's criteria. Results: The majority of maxillary premolars had two separate roots; although, three roots were identified in 1% of maxillary first premolars. However, most of the mandibular premolars had a single root. The two canals (69.9%) and type I (62.6%) and type II (34.1%) configuration for upper first premolar, one canal (82.1%) and type I (77.6%) canal configuration for second premolar was the most prevalent root canal frequency. The most prevalent root canal frequency was the one canal (96.2%) and type I (94.2%) and type V (3.2%) configuration for mandibular first premolar, one canal (98.9%) and type I (98.9%) canal configuration for second premolar. There was no difference in the root canal configurations and the numbers of canals between the left and the right side of both females and males (P > 0.05). Conclusions: Recognition of morphology and anatomy of the root canal system is one of the most important factors for successful endodontic treatment. Preoperative CBCT examination allows determination of root canal configuration of premolar teeth and helps clinicians in root canal treatment.
3
Yassaei, Soghra, Mahdjoube Goldani Moghadam, and S. M. Ali Tabatabaei. "Late Developing Supernumerary Premolars: Reports of Two Cases." Case Reports in Dentistry 2013 (2013): 1–4. http://dx.doi.org/10.1155/2013/969238.
Abstract:
This paper presents two cases of late developing supernumerary premolars. Case 1 is a female patient with nonsyndromic multiple supernumerary teeth located in the maxillary right premolar-molar region, maxillary left premolar region, and the mandibular right and left premolar regions. In this patient surgical removal of all supernumerary teeth was carried out to avoid complications during orthodontic treatment. Case 2 is a female aged 19 years in whom formation of a mandibular supernumerary premolar was observed which was not present at age 13. The patient was made aware of the supernumerary tooth presence, and periodic radiographic assessment was planned.
4
Singh, S., H. Rahman, R. Chandra, S. Tripathi, and M. Mohan. "Asymptomatic Impacted Supernumerary Maxillary Parapremolar." Journal of Oral Health and Community Dentistry 8, no. 2 (2014): 70–71. http://dx.doi.org/10.5005/johcd-8-2-70.
Abstract:
ABSTRACT A case of unilateral impacted supernumerary premolar has been reported. Supernumerary premolars are usually asymptomatic and most cases are diagnosed by a chance during inspection of radiographs.
5
Popovic, Milica, Milos Papic, Aleksandar Acovic, Suzana Zivanovic, and Tatjana Kanjevac. "Cone-beam computed tomography study of root number and root canal configuration of premolars in Serbian population." Medical review 71, no. 3-4 (2018): 100–107. http://dx.doi.org/10.2298/mpns1804100p.
Abstract:
Introduction. The aim of this study was to establish the number of roots and present the root canal configuration in the maxillary and mandibular premolar teeth, and evaluate the relations among these characteristics with gender and teeth position in the Serbian population using cone-beam computed tomography. Material and Methods. Cone-beam computed tomography images of 570 teeth of 150 patients were evaluated. Teeth were classified into the following groups: maxillary first premolars, maxillary second premolars, mandibular first premolars and mandibular second premolars, and the number of roots and root canals per tooth, whereas root canal configurations were examined along with the tooth position and patients? gender. The root canal configuration was classified using Vertucci?s classification. Statistical significance was obtained using Chi square test. Results. In maxillary first premolars, two roots (53.5%) and two root canals (84.5%) were the most prevalent, as well as type IV configuration (58.9%). In maxillary second premolars, most teeth had one root (88.1%) and one root canal (59.6%). In regard to gender, complex configurations with multiple canals were more prevalent in males. Higher incidence of type IV configuration in maxillary first premolars was present on the right side of the jaw (70.2%). Most mandibular first premolars had one root (98.5%). In mandibular second premolar, all teeth had one root and most had type I configuration (96.2%). Males showed higher incidence of two canals in mandibular first premolars. Conclusion. Cone-beam computed tomography is a useful tool for obtaining valuable information on root canal morphology of premolar teeth. Patient?s gender should be considered when performing the preoperative assessment of endodontic treatment.
6
Rajakeerthi, Rajamohan, and Malli Suresh Babu Nivedhitha. "Use of Cone Beam Computed Tomography to Identify the Morphology of Maxillary and Mandibular Premolars in Chennai Population." Brazilian Dental Science 22, no. 1 (January 31, 2019): Process. http://dx.doi.org/10.14295/bds.2019.v22i1.1673.
Abstract:
Objective: The complex root canal anatomy is inherently colonised by microbial flora. Endodontic treatment success is always related to adequate disinfection of the root canal space, which ultimately affects the treatment outcome. A thorough understanding of the external and internal root canal anatomy by using adequately imaging modalities is essential before planning any treatment. The aim of this study was to investigate the number and morphology of the root canals of maxillary and mandibular premolars in Chennai population. Material and Methods: Full-size cone-beam computed tomographic images were randomly collected from 100 patients, resulting in a total of 200 first and 200 second maxillary premolars as well as 200 first and 200 second mandibular premolars. All the eight premolars were analysed in single patients, who underwent cone-beam computed tomography scanning during pre-operative assessment (before implant surgery, orthodontic treatment, diagnosis of dental-alveolar trauma or difficult root canal treatment). Total number of roots and root canals, frequency and correlations between men and women were recorded and statistically analysed by using chi-square tests. The root canal configurations were rated according to the Vertucci’s classification. Results: In the maxillary first premolar group (n = 200), 36.3% had 1 root, 56.7% had 2 roots and 7.0% had 3 roots, with most exhibiting a type IV canal configuration. In the maxillary second premolar group (n = 200), 60% had 1 root, 29.8% had 2 roots and 10.2% had 3 roots, with the majority of single-rooted second premolars exhibiting a type I canal configuration. In the mandibular first premolar group (n = 200), 80.5% had 1 root, 9.8% had 2 roots and 5% had 3 roots. In the mandibular second premolar group (n=200), 90.1% had 1 root, 6.4% had 2 roots and 3.5 % had 3 roots, with most exhibiting a type I canal configuration. No statistical correlation was found between number of roots, gender and tooth position. Conclusion: This cone-beam computed tomographic study confirmed previous anatomical and morphological investigations. Therefore, the possibility of additional root canals should be considered when treating premolars. Keywords: Cone-beam computed tomography; Mandibular; Maxillary; Premolar; Root canal; Morphology.
7
Pamadya, Sandy, Mirza Aryanto, Nurani Hayati, and Johannes Dhartono. "Evaluasi jumlah saluran akar gigi premolar pertama atas menggunakan teknik radiografi periapikal pararel dan Cone Beam Computed Tomography." Jurnal Radiologi Dentomaksilofasial Indonesia (JRDI) 5, no. 1 (April 30, 2021): 7. http://dx.doi.org/10.32793/jrdi.v5i1.671.
Abstract:
Objectives: Maxillary and mandibular first premolars are amongst the teeth that has a risk to caries and needed to be treated. These teeth were varied in term of root and root canal amount. A successful root canal treatment in premolar teeth is highly dependent on the identification of the number and shape of root canals according to Vertucci. Radiographs are still the main choice in helping dentists establish an adequate diagnosis and treatment plan for root canal treatment. Conventional radiographs produce two-dimensional images which often cause difficulties in interpreting the resulting radiograph images. Modern imaging modalities such as CBCT can be used to produce a more accurate image. The aim of this study was to determine whether there is a difference in the number of root canals of maxillary first premolar teeth displayed on periapical radiographs and CBCT and also to test the accuracy of periapical radiographs in detecting the number of root canals of maxillary first premolar teeth compared to CBCT radiographs.
Materials and Methods: This research was experimented by performing periapical radiological examinations and CBCT on 50 maxillary premolar teeth samples, then evaluating the number of visible root canals.
Results: The results showed that there was a significant difference in the number of root canals seen on the periapical radiograph and CBCT.
Conclusion: CBCT radiographs have the advantage of detecting the number of root canals of maxillary premolars more accurately than periapical radiographs.
8
Oliver, Graham, Heather Nevard, and Mary McKnight. "First premolar ankylosis." Orthodontic Update 13, no. 1 (January 1, 2020): 25–29. http://dx.doi.org/10.12968/ortu.2020.13.1.25.
Abstract:
A case is described of a 13-year-old boy who presented with infra-occluded primary molars in three quadrants. Creation of space allowed the second premolars in two quadrants to erupt spontaneously. The first premolar in the remaining quadrant did not erupt spontaneously, failing to reach occlusal contact despite orthodontic traction. CPD/Clinical Relevance: This case demonstrates apparent intermittent ankylosis of a maxillary first premolar.
9
Gomes, Simone Carinhena, Daniela Gamba Garib, Paulo Eduardo Guedes Carvalho, Flávio Augusto Cotrim-Ferreira, and Bárbara Maria De Alencar. "Epidemiological investigation of second premolar agenesis and its relationship with agenesis of other permanent teeth." Revista de Odontologia da Universidade Cidade de São Paulo 21, no. 3 (December 14, 2017): 233. http://dx.doi.org/10.26843/ro_unicid.v21i3.461.
Abstract:
Objective – This study aims to evaluate the epidemiological characteristics of a sample of patients with agenesis of second premolars, as well as to investigate its association with agenesis of other permanent teeth. Material and methods – A Brazilian sample of 203 patients aged from 8 to 22 years was selected, all patients presenting agenesis of at least 1 second premolar. Patient age, gender and ethnicity were recorded, as well as the history of extraction of permanent teeth and associated agenesis of other permanent teeth. Results: – Most individuals presenting second premolar agenesis were female (66%), a sex ratio of 2F:1M. The frequency of second premolar agenesis was higher in the mandible (61.5%) than in the maxilla (16.7%), while 21.6% of the patients showed second premolar agenesis affecting both arches. The prevalence of unilateral and bilateral agenesis was similar (50%) in the maxilla, while in the mandible 60% of the sample exhibited unilateral agenesis. The mandibular left hemi arch was the most frequently affected. Most of the patients (45.3%) had agenesis of just 1 second premolar. There was a high prevalence of agenesis of other permanent teeth associated with second premolar agenesis, especially of maxillary lateral incisors (16%) and third molars (48%). Conclusion: Agenesis of second premolars was more prevalent in females and at the left side of the mandibular arch and was often associated with agenesis of other permanent teeth.
10
Yusuf, Muslim, Nurhayati Harahap, and Dhita Kartika Nasution. "Perubahan harmoni wajah pasca perawatan kelas II skeletal dengan pencabutan dua premolar satu atas menurut analisis Arnett dan BergmanChanges in facial harmony after skeletal class II treatment with extraction of two maxillary first premolars based on Arnett and Bergman analysis." Padjadjaran Journal of Dental Researchers and Students 5, no. 1 (April 30, 2021): 43. http://dx.doi.org/10.24198/pjdrs.v5i1.28263.
Abstract:
Pendahuluan: Arnett dan Bergman (1999) membuktikan bahwa perawatan ortodonti, analisis jaringan lunak wajah, diagnosis dan rencana perawatan memiliki parameter nilai harmoni sebagai kunci penetapan estetika wajah. Perawatan maloklusi klas II skeletal disertai proganotisme maksilaris umumnya dilakukan dengan pencabutan dua premolar satu atas untuk mengkoreksi profil wajah pasien. Tujuan penelitian untuk menganalisis perubahan nilai harmoni wajah pasca perawatan maloklusi kelas II dengan pencabutan premolar satu atas menurut analisa Arnett dan Bergman. Metode: Jenis penelitian analitik observasional dengan teknik pengambilan sampel purposive sampling. Sampel penelitian 72 foto sefalometri lateral maloklusi kelas II skeletal sebelum dan setelah perawatan ortodonti. Penilaian harmoni jaringan lunak dibagi menjadi 4, yaitu harmoni intramandibular, harmoni antar rahang, orbita ke rahang dan keseimbangan wajah. Data menggunakan Shapiro Wilk menunjukkan tidak berdistribusi normal. Uji yang digunakan Shapiro Wilk dan analisis Spearman. Hasil: Terdapat perubahan harmoni intramandibular dan keseimbangan wajah pada maloklusi kelas II skeletal dengan pencabutan premolar satu atas sebelum dan setelah perawatan (p=0,025;p=0,032). Tidak terdapat perubahan nilai harmoni antar rahang dan orbita ke rahang pada maloklusi kelas II skeletal dengan pencabutan premolar satu atas sebelum dan setelah perawatan. Ada pengaruh besar retraksi gigi insisivus terhadap nilai harmoni wajah sebelum dan setelah perawatan pada perawatan kelas II dengan pencabutan dua premolar atas (p= 0.001). Simpulan: Perawatan maloklusi kelas II skeletal dengan pencabutan dua premolar satu atas memiliki hubungan antara besar retraksi dengan perubahan nilai harmoni wajah berdasarkan analisa Arnett dan Bergmann. Kata kunci: Maloklusi kelas II skeletal, pencabutan dua premolar pertama atas, nilai harmoni wajah. ABSTRACT Introduction: Arnett and Bergman (1999) have proved that orthodontic treatment, facial soft tissue analysis, diagnosis, and treatment plan have parameters of harmony values as the key to determining facial aesthetics. Treatment of skeletal class II malocclusion with maxillary prognathism is generally performed by extracting two maxillary first premolars to correct the patient’s facial profile. This study was aimed to analyse changes in the facial harmony values after class II malocclusion treatment with the extraction of the maxillary first premolar following Arnett and Bergman’s analysis. Methods: This research was observational analytic with a purposive sampling technique. The study sample was 72 images of skeletal class II malocclusion lateral cephalometry before and after orthodontic treatment. Assessment of soft tissue harmony was divided into four, namely intramandibular harmony, intermaxillary harmony, orbital to jaw harmony, and facial balance. Data was not normally distributed, as resulted from Shapiro Wilk analysis. The analysis in this study was conducted using Shapiro Wilk and Spearman’s analysis. Results: There were changes in intramandibular harmony and facial balance in skeletal class II malocclusion with the maxillary first premolar extraction before and after treatment (p=0.025 and p=0.032, respectively ). There was no change found in the value of intermaxillary harmony and the orbital to the jaw harmony in skeletal class II malocclusion with extraction of the maxillary first premolar before and after treatment. There was a high effect of incisor retraction on the facial harmony values before and after treatment in class II treatment with extraction of two maxillary premolars (p=0.001). Conclusion: Treatment of skeletal class II malocclusion with extraction of two maxillary first premolars has a relationship between the magnitude of retraction and changes in facial harmony values based on Arnett and Bergmann’s analysis.Keywords: Class II skeletal malocclusion, extraction of two maxillary first premolar, facial harmony.
Dissertations / Theses on the topic "Maxillary premolar":
1
Zigo, Stephan. "A Comparative Study of Rotary Instrumentation of the Maxillary First Premolar Buccal Root Utilizing Cone Beam Computed Tomography." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2396.
Abstract:
The study objective was to determine cementum-dentin wall thickness along the furcation groove in maxillary bifurcated first premolars after preparation with three successively larger, 0.04 tapered, nickel titanium rotary files. Pre-instrumentation and post-instrumentation imaging was accomplished utilizing Cone Beam Computed Tomography. All data was analyzed using an ANOVA. Instrumentation resulted in a significant reduction in dentin-cementum wall thickness (p < .001). At mid-groove, predicted dentin-cementum wall thickness (95% CI) was equal to or less than the proposed standard (0.50 mm) for apical file sizes 30, 35, and 40 respectively. Instrumentation of the mid-groove in maxillary first premolars reduces dentin-cementum wall thickness to levels that may be insufficient to ensure tooth integrity.
2
Wu, Wen-Chou. "In vitro compressive fracture resistance of the human maxillary first premolar with different mod cavity design and restorative materials." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2007m/wu.pdf.
3
Sarao, Manpreet Singh. "Comparative Analysis of WaveOne and LightSpeed LSX for the Residual Dentin Thickness of the Bifurcated Maxillary First Premolar Buccal Root Utilizing Limited Field Cone Beam Computed Tomography." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3093.
Abstract:
The purpose of this study was to compare the thickness of dentin removed from the buccal root of bifurcated maxillary first premolars (BMFP) in the area of furcation groove after instrumentation with WaveOne and LightSpeed LSX files utilizing limited field cone beam computerized tomography. All data was analyzed using repeated-measured mixed-model ANOVA and differences were described using Tukey’s multiple comparison procedure. The thickness of dentin removed with LightSpeed LSX files (0.1 mm) was significantly less than the thickness of dentin removed with WaveOne files (0.2 mm). To conclude, LSX files remove a more predictable and consistent thickness of dentin from the buccal root of BMFP, irrespective of the pre-instrumentation thickness of dentin and the file size when compared to WO files that remove a more variable thickness of dentin.
4
Nohl, Francis Sebastian Alexander. "Stress analysis of maxillary premolars in relation to non-carious cervical lesions." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247908.
5
Krygowski, Sarah. "The prevalence, predictive factors, and classification of intrapulpal cracks in maxillary premolars requiring endodontic treatment." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3869.
Abstract:
Cracked teeth may be difficult to diagnose. Craze lines rarely become symptomatic or require treatment. Cracks in the enamel and dentin alone may or may not become symptomatic and require restorative treatment. However, cracks extending into the enamel, dentin, and pulp chamber provide an avenue for bacteria to establish infection and this commonly results in symptoms and the need for endodontic and restorative treatment. The published endodontic literature has limited information regarding the prevalence or predictive factors for cracks extending into the pulp chamber of teeth. The purpose of this study was to determine the prevalence and classification of intrapulpal cracks in maxillary premolars and to identify factors that may aid in diagnosing the existence and extent of a crack. The cracks were classified according to the Intrapulpal Crack Classification System proposed by Detar in 2014. All maxillary premolar teeth treatment planned for non-surgical root canal therapy (NSRCT) or retreatment (RETX) at Virginia Commonwealth University (VCU) Graduate Endodontic Practice from January 2014 through February 2015 were included in the study after obtaining patient consent. Teeth were examined visually, stained, and examined microscopically for the presence of an intrapulpal crack. Demographic information, subjective data associated with the chief complaint, objective results of diagnostic testing (percussion, palpation, bite stick test, transillumination, probing depths), existing restorations, pulpal diagnosis, and periapical diagnosis were analyzed using chi-square and multiple logistic regression (P
6
Biagi, Amanda Buosi de. "Avaliação, por meio de microtomografia computadorizada, da anatomia interna e externa de primeiros pré-molares superiores." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-04022015-090126/.
Abstract:
O objetivo do presente estudo foi avaliar a anatomia do sistema de canais radiculares (SCR) de 72 primeiros pré-molares superiores (32 unirradiculares, 30 birradiculares com sulcos e 10 trirradiculares), por meio de microtomografia computadorizada (μCT). As amostras foram escaneadas no microtomógrafo SkyScan 1174 v2, e as imagens geradas foram reconstruídas para análise dos parâmetros bidimensionais (número, área, circularidade , diâmetro maior e menor, fator de forma) a 1, 2, 3 mm do forame apical e tridimensionais (volume, área de superfície, índice de estrutura do modelo - SMI, número e localização de canais acessórios), bem como avaliação das características anatômicas externas da raiz (presença, localização, profundidade e extensão do sulco e espessura interna e externa de dentina) e análise qualitativa dos modelos tridimensionais. Os resultados mostraram que o número máximo de canais no terço apical foi três. A 1 mm do forame apical, nos dentes unirradiculares, o diâmetro maior foi, em média, duas vezes maior que o diâmetro menor. O padrão de circularidade demonstrou forma circular com tendência ao achatamento dos canais dos dentes unirradiculares e uma forma mais circular nos canais dos bi e trirradiculares, principalmente nas raízes palatinas. Os resultados do fator de forma confirmaram a forma mais circular dos canais em todos os dentes avaliados. Na análise tridimensional, as maiores médias de volume (14,84±10,78mm³) e área de superfície (83,65±48,26mm²) foram encontradas nos canais radiculares dos pré-molares unirradiculares, e as menores médias de volume (3,78±1,61mm³) e área de superfície (25,11±6,17mm²) foram observadas na raiz disto-vestibular dos primeiros pré-molares superiores trirradiculares. Os valores de SMI foram semelhantes em todas as raízes nos três grupos dentais avaliados, evidenciando uma forma tridimensional cônica com tendência cilíndrica dos canais radiculares. A presença de um canal acessório variou de 45% a 100% no terço apical e de 15% a 100% no terço médio em todas as raízes dos grupos dentais avaliados. Na análise radicular externa, foram encontrados 35 sulcos radiculares (23 únicos e 12 duplos), sendo encontrados na face palatina da raiz vestibular em 100% dos pré-molares superiores birradiculares. A profundidade do sulco apresentou maior valor médio (0,57±0,27mm) na secção transversal correspondente à 1mm acima da metade da extensão total do sulco. O teste de correlação mostrou que nas secções transversais mais cervicais em relação ao suco, quanto maior a sua profundidade, maior é o achatamento e a ocorrência de divisão dos canais radiculares. Os modelos tridimensionais evidenciaram a prevalência da classificação tipo IV de Vertucci. Dessa forma, conclui-se que a μCT possibilitou o estudo detalhado da anatomia interna e externa do SCR em primeiros pré-molares superiores uni, bi e trirradiculares.The aim of this study was to evaluate the anatomy of the root canal system (RCS) of 72 maxillary first premolars (32 single-rooted, 30 two-rooted with radicular grooves and 10 three-rooted), using computed microtomography (μTC). The specimens were scanned with the SkyScan 1174v2 microtomography device and the images were reconstructed for analysis of two-dimensional parameters (number, area, roundness, major diameter, minor diameter, and form factor) at 1, 2 and 3 mm of the apical foramen, and three-dimensional parameters (volume, surface area, structure model index - SMI, number and location of accessory canals), as well as examination of external anatomic characteristics of the roots (presence, location, depth and extension of the grooves, and internal and external dentin thickness) and qualitative analysis of the three-dimensional models. No more than three canals were found in the apical third. At 1 mm from the apical foramen in single-rooted teeth, mean values of the major diameter were twice as higher than those of the minor diameter. The roundness pattern of the canals revealed a round shape with a tendency to flattening in the single-rooted premolars, and a shape with more accentuated roundness in the two- and three-rooted premolars, mainly in the palatal roots. The form factor results confirmed the more circular shape of all teeth. In the three-dimensional analysis, the highest values of mean volume (14.84±10.78mm³) and surface area (83.65±48.26mm²) were found in the canals of the single-rooted premolars, and the lowest values of mean volume (3,78±1,61mm³) and surface área (25,11±6,17mm²) were observed in the distobuccal root of the three-rooted premolars. The mean SMI values were similar in all roots of the three groups of premolars, indicating a tendency to a 3D cylinder-like geometry of the canals. The presence of one accessory canal ranged from 45 to 100% in the apical third and 15 to 100% in the middle third in all evaluated roots. In the examination of the external root surface, 35 radicular grooves (23 singles and 12 doubles) were found, with prevalence (100%) in the palatal face of the buccal root in two-rooted premolars. The radicular groove depth presented higher mean value (0.57±0.27mm) in the cross-section corresponding to 1 mm above the middle point of the full length of the groove. The correlation test showed that in the cross-sections more coronal to the groove, the greater the depth, the more accentuated the flattening and the greater the occurrence of division of the canals within the root. The analysis of the tree-dimensional models demonstrated the prevalence of Vertucci\'s type IV configuration. In conclusion, the use of μCT provided a detailed evaluation of the internal and external anatomy of the RCS in singlerooted, two-rooted and three-rooted maxillary first premolars.
7
Petroche, Maria Fernanda DMD. "A classification of maxillary premolar sockets in relation to the osseous housing for immediate implant placement." Thesis, 2021. https://hdl.handle.net/2144/42892.
Abstract:
The aim of this study was to establish a classification system for use in immediate implant placement by examining fresh extraction sockets in maxillary premolars and evaluation of the varying morphologies using CBCT imaging. Selection criteria included dentulous patients ages 15-85 that had CBCT imaging taken for varying treatment. A total of 400 maxillary premolars were classified by their root morphology as Type I (two-rooted premolar with interradicular bone), II (fused roots with mesiodistal alveolar constriction) or III (single blunted root with no interradicular bone). The internal root angle was measured for all Type 1 maxillary first premolars (n=40), as well as the interradicular septal bone height. A Type 1 premolar socket is present in 32% of the sampled maxillary first and second premolars. Type 2 socket was present in 22% of premolars, and type 3 socket was present in 46% of premolars. The average internal angle formed between the long axis of the crown versus the long axis of the palatal root was 11.46 ± 4.35° (range 4° to 20.7°). The average interradicular septal bone height was of 6.9 ± 1.6 mm (range 3.28 to 9.61). Type I root form had the highest incidence at maxillary first premolars sites and has the most alveolar bone available, thus having a higher probability for primary stability. The type III root form is most common in the maxillary second premolar site and has the least amount of alveolar support for immediate implant placement. The angulation and alveolar bone support provided by the palatal root in Type I root form maxillary first premolar sites may provide stability for an immediate implant at an appropriate prosthetic position.
8
Lee, Pei Ying, and 李沛縈. "Microleakage in Human Maxillary Premolar in Different Mesio-occlusal-distal (MOD) Restoration Combined with Non-caries Cervical Lesions (NCCL) Restoration." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/39504290007523435155.
Abstract:
碩士長庚大學
顱顏口腔醫學研究所
97
Background The restorative treatment of MOD cavity and NCCL cavity will result in microleakage and destruction of teeth. The microleakage causes post-operative sensitivity, second caries and failure of the restorations. The present study was to evaluate the impact of biomechanical change of the teeth after the restoration of MOD cavity and NCCL cavity on the microleakage. Methods In the present study, the depth of MOD cavity (1/2 or 2/3), depth of NCCL (1mm or 2 mm), and angle of NCCL cavity (45°or 90°)were used to define eight study groups (each group had five premolars). Direct composite resin restoration was used. After the thermocycling test (2000times, 5℃-55℃for 30 second), and vertical fatigue loading test (20,000times, 49N), the premolars were dyed with 2﹪basic fuchsin dye for 24 hours, and cut in to slice for further microscopic examination. Results The premolar with MOD cavity depth (1/2) had more microleakage than MOD cavity depth (2/3) in occlusal wall（NO）and gingival wall (NG)(p=0.02). The premolar with NCCL cavity depth (1mm) had more microleakage than those with NCCL cavity depth (2mm) in NO. The NCCL cavity angle did not increase microleakage in all section. After multivariate logistical regression, both NCCL cavity depth (1mm) and MOD cavity depth (1/2) increase the microleakage in NO (NCCL, odds ratio=13.2, p＝0.02; MOD, odds ratio＝10.8, p＝0.03). Conclusion Under vertical loading, the depth of MOD cavity did not influence the microleakage of the MOD restoration, however, it would influence the microleakage of the NCCL restoration. The depth of NCCL cavity was shallower; the microleakage of the NCCL restoration was increased.
9
Ferruzzo, Alexandra Bouery Schiano Di. "Autotransplante dentário: revisão bibliográfica." Master's thesis, 2017. http://hdl.handle.net/10284/6134.
Abstract:
Objetivos: O objetivo desta investigação foi avaliar as evidências científicas atualmente
disponíveis sobre o autotransplante dentário.
Materiais e métodos: realizaram-se pesquisas electrónicas na Pubmed, LILACS e JEBDP,
para identificar os ensaios clínicos randomizados controlados e prospectivos. Uma seleção
manual foi executada de acordo com o nível de evidência de cada artigo sobre o tema
escolhido nesta dissertação.
Tema principal: Em Medicina Dentaria, nas opções de tratamentos que podem ser propostas a
um paciente para substituir um dente perdido, o auto transplante dentário é muitas vezes
esquecido em favor da prótese fixa ou removível, ou do implante. Esta técnica tem muitas
vantagens para o paciente. Torna-se assim numa solução economicamente e psicologicamente
mais aceitável, com duas grandes vantagens: adaptar-se ao crescimento do paciente e uma
osteointegração quase comparável ao implante.Objectives : The aim of this investigation was to assess the currently available evidence concerning tooth auto transplantation. Materials and methods : Electronic searches were conducted on Pubmed, LILACS and JEBDP, to identify randomized controlled and prospective clinical trials. After that, manual selection was operated in relation to the evidence level of every article about the topic of this dissertation. Principal topic : In the panel of solutions which can be propose to a patient to replace a missing tooth in dentistry, dental transplant is a lot of time forgotten in favor of fixed or removable prosthesis, or implant. Nonetheless, this technic have a lot of advantages for the patient : this an economical and psychological attractive solution with two majors advantages : adapt to the growing patient and osteointegration comparable to implant.
10
Silva, Paulo Roberto Alves. "Deflexão cuspídea em pré-molares maxilares com tratamento endodôntico e reabilitados com restauração direta: revisão de literatura." Master's thesis, 2017. http://hdl.handle.net/10284/6405.
Abstract:
Entende-se deflexão cuspídea como uma alteração da trajetória natural das cúspides, resultando num desvio de posição, que ocorre sobretudo quando há uma grande redução da estrutura dentária.
A redução da estrutura de uma peça dentária ocorre por várias razões, seja por (1) cáries dentárias, (2) características do preparo cavitário, (3) perda de uma restauração extensa e (4) pelo acesso cavitário com finalidade de tratamento endodôntico. Todos esses fatores, aliados à oclusão do paciente, podem levar à fratura dentária, sendo a sua ocorrência mais comum em pré-molares maxilares devido à forma anatómica e função mastigatória.
Este trabalho visa realizar uma revisão da literatura relativa aos fatores predisponentes à deflexão cuspídea, abordando as opções de tratamento associadas a uma redução do risco de fratura em pré-molares maxilares com tratamento endodôntico e reabilitados com restauração direta. Para isso foi elaborada uma pesquisa bibliográfica, na PubMed/Medline, B-On e biblioteca da Universidade Fernando Pessoa.Cuspal deflection is defined as an alteration to the natural trajectory of the cusp, resulting in a positional shift, and occurs when large reductions to the tooth structure are carried out. Tooth structure reduction may occur for various reasons: (1) due to caries, (2) as consequence of tooth preparations, (3) loss of an extensive restoration or (4) endodontic access cavity preparation. These factors, combined with the patient's occlusion, may result in dental fracture, most commonly occurring in maxillary premolars due to anatomical shape and masticatory function. The aim of this study is to review the predisposing factors of cuspal deflection, including the treatment options which can help reduce the risk of fracture in endodontically treated maxillary premolars restored with direct restorations. A bibliographic search was conducted on PubMed/Medline, B-On and in the library of University of Fernando Pessoa.
Book chapters on the topic "Maxillary premolar":
1
Manuel, Suvy. "OroAntral Communications and OroAntral Fistula." In Oral and Maxillofacial Surgery for the Clinician, 491–512. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-1346-6_24.
Abstract:
AbstractRoutine exodontia is a common procedure performed by the general dental practitioner and the oral surgeon alike. Most of the maxillary premolar/molar extractions heal uneventfully, but some may cause inadvertent opening into the maxillary sinus, manifesting as immediate oroantral communications (OACs) or delayed oroantral fistulae. The common reasons being difficulty encountered in the extractions intra-operatively due to myriads of reasons or the OAC may be due to a pre-existing pathology in the periapical region or within the sinus lining. Whatever the reason be, it is paramount that the surgeon identifies the problem and approaches it in a sequential manner to avoid long-term consequences and to attain a perfect closure. The timing of the closure is crucial, which is dependent upon the sinus health and the socket condition. This may be complicated by a missing root tip, which is lying in the sinus. This chapter aims to walk the reader through these events in a logical fashion so that they can take appropriate decisions and use the correct surgical technique, which will ensure successful closure of the defect.
2
Nagaş, Işıl Çekiç, Ferhan Eğilmez, and Bağdagül Helvacioğlu Kivanç. "The Permanent Maxillary and Mandibular Premolar Teeth." In Dental Anatomy. InTech, 2018. http://dx.doi.org/10.5772/intechopen.79464.
3
Kim, Tae-Woo, and Hyewon Kim. "Precise miniscrew implant insertion technique between the roots of maxillary second premolar and first molar (Kim's stent)." In Skeletal Anchorage in Orthodontic Treatment of Class II Malocclusion, 97–100. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-7234-3649-2.00017-8.
4
(Phulari), Rashmi. "The Permanent Maxillary Premolars." In Textbook of Dental Anatomy, Physiology and Occlusion, 156. Jaypee Brothers Medical Publishers (P) Ltd., 2014. http://dx.doi.org/10.5005/jp/books/11986_10.
5
Atkinson, Martin E. "Mastication." In Anatomy for Dental Students. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199234462.003.0035.
Abstract:
Now you have an understanding of the anatomy of the maxilla and mandible, the TMJs, and jaw musculature, we can examine how these structures work together to produce the complex actions involved in the biting and chewing of food. Technically, incision is biting a piece from a larger chunk of food and mastication is the grinding down of that piece into smaller components and mixing them with saliva. Mastication is often used to cover both actions. Box 26.1 briefly compares the anatomy of the human dentition to that of other mammals. As well as knowledge of the TMJ, muscles of mastication, and other muscles used in jaw movements, it is necessary to appreciate some aspects of the static and dynamic relationships of the teeth to understand chewing movements. The first thing to notice is the bigger width of the upper dental arch compared to the lower arch, a condition known as anisognathy. In Figure 26.1A , you can see that the maxillary molars overhang the mandibular teeth by half a cusp width so the buccal cusps of the lower molars and premolars occlude between the buccal and palatal cusps of the maxillary teeth. Observe also that the long axis of the maxillary molars and premolars incline buccally while the corresponding axis of the mandibular teeth incline lingually; the occlusal plane of the posterior teeth is thus curved transversely as illustrated in Figure 26.1A . It would be possible to chew food simply by moving the teeth up and down without any side-to-side movement, but this would be inefficient and not make full use of the cusps on the occlusal surfaces of posterior teeth. However, we can only chew on one side at a time because of the anisognathy of the upper and lower teeth. Due to anisognathic jaw positions, the maxillary anterior teeth are also going to protrude in front of the mandibular anterior teeth. Figure 26.1B illustrates the normal relationships of the anterior teeth. The maxillary incisors overhang the mandibular incisors by about 2–3 mm in the horizontal plane; this is called the overjet. The upper incisors usually have a vertical overhang, the overbite, of about the same amount. As mentioned in Chapter 24 , the mouth at rest is closed by tonic contraction of the muscles of mastication and facial expression.
6
Trinkaus, Erik, Alexandra P. Buzhilova, Maria B. Mednikova, and Maria V. Dobrovolskaya. "The Sunghir Dental and Alveolar Remains." In The People of Sunghir. Oxford University Press, 2014. http://dx.doi.org/10.1093/oso/9780199381050.003.0012.
Abstract:
Sunghir 1, 2, and 3 retain most of their maxillary and mandibular teeth, although those of Sunghir 1 are heavily worn and those of Sunghir 2 and especially Sunghir 3 were developing at the times of their deaths. As a result, the two immature individuals provide extensive data on their dental crown discrete morphology and crown metrics, but there are limited data on the third molars of Sunghir 2 and on the premolars and second molars of Sunghir 3 (and none on her third molars beyond their calcification stage; see chapter 6). In addition, although they retain none of their teeth, Sunghir 5 and especially 6 preserve alveolar bone, and they thereby provide limited dentoalveolar data. The Sunghir dentitions and alveoli thus have the potential to provide paleobiological data on their crown configurations, crown dimensions, some root lengths and configurations, in addition to wear patterns. The condition and salient aspects of each are provided first, followed by comparisons of their dimensions and shapes in a Late Pleistocene context. As noted in chapter 4, Sunghir 1 retains 31 of his original 32 teeth, and the one missing tooth, the left I2, was probably lost shortly before death. All of the teeth are heavily worn, thereby limiting morphological and morphometric observations principally to the M3s. But the other teeth provide considerable information regarding their wear patterns. The right I1 consists of worn dentin with a partial thin enamel ring around the labial margin of the crown. The dentin is occlusally flat to convex, the convexity produced mostly by a rounding of the lingual edge of the crown. There is a small area of secondary dentin exposed in the middle of the occlusal dentin. Note that the protruding nature of the tooth is a postmortem artifact, and it probably was originally at the same level as the left I1. There is no unusual wear in the mandibular incisors to match its procumbent state. The left I1 has similar wear, except that it retains more of the thin enamel ring around the lingual side and hence lacks the lingual rounding evident on the right one.
7
Robinson, Max, Keith Hunter, Michael Pemberton, and Philip Sloan. "Diseases of the teeth and supporting structures." In Soames' & Southam's Oral Pathology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199697786.003.0010.
Abstract:
A wide variety of processes can affect the formation of teeth during development. The number, size, shape, and quality of dental hard tissue may be abnormal and teeth may erupt early or be prematurely shed or resorbed. When a child presents with a tooth abnormality, the clinical and radiographic features are often distinctive and management depends on diagnosis (Box 5.1). Broadly, developmental abnormalities of the teeth can be either genetically determined or acquired as a result of injurious processes affecting the developing teeth. It can be problematic to make a diagnosis, particularly when teeth initially erupt. Sometimes pathological examination of a shed or extracted tooth by ground sectioning (for enamel) or conventional sectioning of a decalcified tooth can provide a diagnosis. Research has provided insights into the genetic and structural basis of dental anomalies, and has resulted in a complex and extensive classification of subtypes. Minor abnormalities, such as failure of development of a few teeth or enamel erosion in adult life, may be dealt with in general dental practice, but it is advisable to refer younger patients with more complex or extensive dental abnormalities to a specialist in child dental health, with links to expert diagnostic facilities and input from orthodontic and restorative colleagues. The publically available Online Mendelian Inheritance in Man (OMIM) database provides an invaluable resource for genetic disorders, including dental abnormalities. Supernumerary teeth are common and may be rudimentary in form or of normal morphology, when they are referred to as supplemental teeth. The most common supernumerary tooth occurs in the mid- line of the maxillary alveolus and is referred to as a mesiodens, which usually has a conical shape. Eruption of adjacent normal successor teeth may be impeded by a mesiodens, which is an indication for its removal. Most supernumerary teeth occur as a sporadic event in development, but multiple extra teeth can be found in certain developmental disorders. Failure of development of tooth germs results in teeth missing from the dental arch and is referred to as hypodontia. Most often the missing teeth are third molars, second premolars, and upper lateral incisors. Hypodontia is more common in the permanent dentition than in the primary teeth.
Conference papers on the topic "Maxillary premolar":
1
Fedotova, Veronika, Estevam Barbosa de las Casas, Osvaldo L. Manzoli, Claudia M. A. Mattos, and Eduardo A. Rodriguez. "FAILURE MECHANICS OF AN ENDODONTICALLY TREATED MAXILLARY FIRST PREMOLAR: A NUMERICAL ANALYSIS." In XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering. Florianopolis, Brazil: ABMEC Brazilian Association of Computational Methods in Engineering, 2017. http://dx.doi.org/10.20906/cps/cilamce2017-1048.
2
Fedotova, Veronika, Estevam Barbosa de Las Casas, Osvaldo Luís Manzoli, Claudia Machado de Almeida Mattos, and Eduardo Alexandre Rodrigues. "CRACK INITIATION AND PROPAGATION IN A POST-AND-CORE RESTORED MAXILLARY FIRST PREMOLAR: A 2D ANALYSIS." In 6º Encontro Nacional de Engenharia Biomecânica. ABCM, 2018. http://dx.doi.org/10.26678/abcm.enebi2018.eeb18-0120.
3
Hajizadeh, Maryam, Farzan Ghalichi, Behnam Mirzakouchaki, and Shirin Shahrbaf. "Comparison of Stress Distribution Pattern in Orthodontic Bracket- Adhesive- Tooth System During Treatment Time and Debonding Stage." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82622.
Abstract:
Fixed orthodontic treatment is based on effective bonding of bracket to enamel surface. During orthodontic therapy, load is applied on bracket slot by orthodontic wire, and then it is transferred to adhesive layer and enamel surface (state I). After the completion of treatment period, orthodontic brackets are debonded by load application on the incisal region of bracket-adhesive interface (state II). In order to compare the diversity in stress distribution pattern of these two states, micro CT images of maxillary premolar tooth and bracket were transformed to STL files and imported to Hypermesh software to create high quality 3D finite element models. Space between enamel and bracket was filled with orthodontic adhesive material which sets to 0.2 mm at thickest region. Mechanical property was assigned to each layer and appropriate boundary conditions were applied. By using a load distributing element RBE3, firstly 150 N shear load was applied on the bracket slot to simulate bracket-adhesive-tooth system of state I and secondly the same load was applied on the incisal area of bracket and bracket-adhesive bonding to simulate bracket-adhesive-tooth system of state II. Generated stresses on the bracket, the adhesive and the tooth in both systems were obtained and compared to each other. The Findings of this study, reveal that the effect of bonding loads was directly transform to the adhesive layer and the enamel surface; hence, treatment period would decrease. Alternatively, debonding loads would bring about higher stresses on the bracket and facilitate debonding action.
4
Ebihara, Arata, Yoshiko Iino, Toshihiko Yoshioka, Takahiro Hanada, Mitsuhiro Sunakawa, Yasunori Sumi, and Hideaki Suda. "Apices of maxillary premolars observed by swept source optical coherence tomography." In SPIE BiOS, edited by Peter Rechmann and Daniel Fried. SPIE, 2015. http://dx.doi.org/10.1117/12.2076924.