Prevalence and Characterization of External Cervical Resorption Using Cone Beam Computed Tomography.

INTRODUCTION: The aim of this study was to assess the prevalence of external cervical resorption (ECR) and characterize the cases of ECR using cone beam computed tomography (CBCT). METHODS: High-resolution CBCT scans of 6216 patients (2280 males and 3936 females), consecutively acquired during the period July 2021 to March 2022, were analyzed. Identified cases of ECR were characterized by 3 evaluators regarding lesion height, circumferential spread, portal of entry proximity to root canal, stage, location, and width. RESULTS: In a total of 38 patients and 40 teeth, ECR cases demonstrated an incidence of 0.61%. The median age of the patients was 39 years. Prevalence of ERC was 0.78% among males and 0.50% among females. The most affected teeth were the maxillary incisors and canines. The most frequent characteristics of the lesion were: extension up to the cervical third (47.5%), more than 270° circumferential spread (42.55%), probable pulpal involvement (57.5%), progressive stage (65%), supracrestal (52.1%) and mesial (34.7%) localization of >1 mm in size (52.1%) portals of entry. Cases with greater longitudinal involvement also showed greater circumferential progression (P = .008). There was no association between portal of entry location and bone crest or ECR reparative phase (P = .42). Inter-rater agreement ranged from good to very good. No association between portal of entry and ECR progression was observed. CONCLUSIONS: ECR showed low prevalence in the Brazilian population, affecting mostly anterior maxillary teeth of patients within a wide age range. CBCT allowed characterization of ECR lesions with good interobserver agreement.

Radiographic dental age estimation applying and comparing Demirjian's seven (1973) and four (1976) teeth methods.

To apply Demirjian's seven (1973, D7) and four (1976, D4) teeth methods in a sample of Brazilian children and compare their performances for age estimation. Panoramic radiographs of 1200 children (600 females and 600 males) were collected from Southeast Brazil. The children were equally distributed (n = 60 females and 60 males) between age intervals of 1 year between 6 and 15.9 (mean age = 10.9; standard deviation [SD]: 2.9) years. D7 and D4 dental age estimation methods were applied by two observers and were compared based on their error rates (error = estimated age-chronological age). Both methods overestimated the chronological age (p < 0.0001). D7 led to overestimations of 0.71 (p < 0.0001) in females and 0.83 (p < 0.0001) in males, while the overestimations with D4 were 0.14 (p = 0.0067) and 0.73 (p < 0.0001) for females and males, respectively. The mean age estimated by D7 was 11.7 (SD: 3.1) years, while for D4, it was 11.3 (SD: 3.3) years. Intra- and interobserver agreement was ≥ 0.98. D4 optimized the performance of radiographic dental age estimation compared to D7. Improvements were reflected in the total sample and separately for female and male children from Southeast Brazil.

Effect of decompression and online transmission on the dimensional changes of .stl files generated by intra-oral scanning.

Intraoral scans became part of the virtual planning in Dentistry. In the new scenario of digital workflows, dental clinics and laboratories had to establish an online communication that requires the compression, decompression, and transmission of 3D files. Knowledge about the effects of these procedures on the dimensional properties of the files is fundamental to ensure a more realistic virtual planning. The aim of this study was to assess the influence of 3D file compression, decompression, and online transmission on the dimensional properties of dental models from intraoral scanning. Intraoral scan files in.stl format of 50 patients were selected from the database of a dental radiology clinic, with 25 of these patients with mixed dentition and 25 with permanent dentition. The maxilla and mandible scans of each patient were included in the study, generating a total of 100 files. A folder with the 100 files was created and replicated six times with different labels (A, B, C, D, E, F), totaling a sample number of 600 files. Folder A was compressed by WinZip and then decompressed. Folder B went through the same process, but the step of compression and decompression by WinZip was repeated 10 times. The folders C, D, E, F were sent, respectively, through the platforms WeTransfer, Dropbox, Google Drive, and OneDrive, then each of them was downloaded in their respective platforms. After the six folders went through the compression process and were sent by the platforms, each file in the folder was compared with its original file by superimposing the 3D images and identifying the dimensional deviation in the compressed file in relation to the original file. We observed that there were no differences between the six groups regarding dimensional changes from the compression, decompression and online transmission processes. The lack of dimensional changes was observed for the sets of permanent and deciduous. teeth We concluded that it is possible to compress, decompress, and transfer.stl format files online without causing dimensional distortions in the 3D model.

Detecção de calcificação da artéria carótida em radiografias panorâmicas: levantamento na população goiana / Detection of carotide artery calcification in panoramic radiographs: survey on goias state population

Objetivo: Investigar a prevalência de imagens compatíveis com calcificação da artéria carótida (CAC), como achado incidental em exame por imagens panorâmicas na população Goiana. Métodos: Foram analisadas radiografias panorâmicas digitais obtidas de pacientes com idade igual ou superior a 40 anos, de ambos os gêneros, encaminhados ao serviço de radiologia de clínica particular. Dois examinadores, com conhecimento em radiologia, analisaram a presença de áreas radiopacas circunvaladas, na altura das vértebras C3 e C4, com angulação de 45 graus formada com o ângulo da mandíbula, sugestivas de CAC. Resultados: Foi encontrada uma prevalência de 14,1% de CAC na população estudada. Além de observado um risco mais elevado de desenvolvimento de CAC em pacientes com idade superior a 55 anos (OR=1,82). Houve diferença estatisticamente significante entre a presença de CAC e gênero (p=0,003). A concordância entre examinadores foi considerada muito boa (K=0,89). Conclusões: Observou-se que CAC apresentou uma prevalência considerável, sendo a radiografia panorâmica um método com potencial para detecção da presença de CAC, devendo o cirurgião-dentista atuar na prevenção e diagnóstico de pacientes em grupo de risco de eventos cardiovasculares e vasculocerebrais.

Introduction: To investigate the prevalence of images compatible with carotid artery calcification (CAC), as an incidental finding on examination by panoramic images in the Goias population. Methods: Digital panoramic radiographs were obtained from patients aged 40 years older, of both genders, referred to the private clinic radiology service. Two examiners, experienced in radiology, analyzed the presence of circumferential radiopaque areas, at the height of the C3 and C4 vertebrae, with 45 degree angulation formed with the angle of the mandible, suggestive of CAC. Results: A prevalence of 14.1% of CAC was found in the study population. A higher risk of developing CCS was observed in patients older than 55 years (OR = 1.82). There was a statistically significant difference between the presence of CAC and gender (p = 0.003). Agreement between examiners was considered satisfying (K = 0.89). Conclusion: It was observed that CAC presented a considerable prevalence, thus panoramic radiographs represent a potential method for detecting the presence of CAC, and the dentist should act in the prevention in the diagnosis of patients in a group at risk in cardiovascular and vascular-cerebral events.