ABSTRACT Objective: To evaluate the droplets and aerosols, posing potential risks of infection transmission of COVID-19 disease in dentistry. Material and Methods: PubMed, Embase, ISI, Scopus, Medicine have been used to search for articles between September 2019 to December 2020. Data extracted from the studies were included, study, study design, sample size, Sample collection time, Hallway Air Samples (copies/L of air), Personal Air Samples (copies/L of air). Effect size with 95% confidence interval (CI), fixed effect model, Inverse-variance methods were calculated. The Meta-analysis was evaluated with Stata/MP v.16 statistical software (The fastest version of Stata). Results: According to the purpose of the study, 64 articles were found; studies that did not meet the inclusion criteria were excluded from the study; the full text of 11 studies was reviewed. Finally, two studies were selected. The effect size of airborne COVID-19 concentrations of the hallway and personal air samples was 64% copies/L of air (ES, 0.64 95% CI=-1.45-2.73) and 100% copies/L air (ES, 1.00 95% CI=-1.77-3.76), respectively. Conclusion: Evidence of aerosol transmission of COVID-19 in observational studies of patients with COVID-19 was 64% copies/L of air and 100% copies/L of air in the hallway and personal air samples, respectively.

RESUMO Objetivo: Investigar e quantificar achados incidentais em exames de tomografia computadorizada de feixe cônico realizadas unicamente para fins ortodôntico. Métodos: Foram incluídos os exames de tomografia de feixe cônico com finalidade de diagnóstico ortodôntico no período de novembro de 2011 a abril de 2014 (n=202) avaliados por dois examinadores e os dados coletados classificados em cinco grupos diferentes. Foi realizada análise exploratória dos dados através do cálculo de média, desvio padrão, frequência e porcentagem. A associação entre o local do achado e o gênero foi verificada através do teste exato de Fisher. Resultados: Foi encontrado um total de 227 achados; o grupo com maior número de achados foi o de origem dental (n=157), seguido do grupo de vias aéreas (n=46), de crânio (n=16) e de ATM (n=8). Exames sem nenhum achado representaram 20% do total. Os sujeitos com menores médias de idade foram encontrados no grupo de vias aéreas. A prevalência de alterações tomográficas incidentais em pacientes ortodônticos é alta. Conclusão: Um cuidadoso diagnóstico das imagens de tomografia de feixe cônico além da região de interesse ortodôntica é indispensável para prevenir patologias ocultas. Estudos adicionais podem ser realizados para avaliar qual a influência desses achados no tratamento ortodôntico.

ABSTRACT Objective: The aim of this retrospective study was to determine and quantify incidental findings in CBCT scans taken exclusively for orthodontic purposes. Methods: A total of 202 scans were evaluated by two examiners and classified into five different groups. Results: A total of 227 incidental findings were found in a sample of patients aged 5-58 years old. The highest number of findings was of dental origin (n = 157), followed by airway (N = 46), skull (N = 16) and ATM (n = 8). Scans with no incidental finding accounted for 20% of the examinations. Subjects having lower mean age were found in the group of airway findings. The prevalence of incidental findings in the current study was consistent with the literature, thus corroborating their high frequency. Orthodontists who make use of CBCT are responsible for assessment of all data. Conclusion: The precise evaluation of incidental findings may help in the early diagnosis, treatment and patient monitoring. Further studies should be conducted to assess the influence of these findings on the orthodontic treatment.

Abstract This study aimed at evaluating the validity of cone-beam computed tomography (CBCT) for assessing mandibular bone quality using the Klemetti classification. The morphology of the endosteal mandibular cortex of 30 (60 hemi-mandibles) postmenopausal women between the ages of 45 and 80 years was evaluated based on the Klemetti classification in panoramic radiographs used as reference images. Afterwards, panoramic reconstruction and cross-sectional slices of CBCT examinations of these patients were analyzed and categorized according to the same classification. All the images were assessed by two oral radiologists. The McNemar-Bowker test compared the agreement between the CBCT images and the reference images. No differences were found between the diagnostic results based on panoramic radiography and panoramic reconstruction. However, the mean scores for the cross-sectional evaluation were higher, and the results, statistically different from the others. Based on the disagreement found between the panoramic radiographs and the CBCT cross-sectional slices, the Klemetti classification is not an adequate means of assessing bone quality with CBCT. On the other hand, the higher values found for the cross-sectional slices could be associated with better visibility on the CBCT images.