Resumo A instalação de implantes no segmento anterior da mandíbula, é um tratamento utilizado para reabilitação de mandíbulas atróficas. Para melhorar a estabilidade primária desses implantes, a base da mandíbula pode ser usada como ancoragem complementar (bicorticalização). Este estudo objetiva analisar a biomecânica de mandíbulas atróficas, reabilitadas com prótese sobre implantes monocorticalizados ou bicorticalizados. Para isso foram confeccionados dois modelos tridimensionais de mandíbula desdentada e com atrofia severa. Em um deles foram instalados 4 implantes monocorticalizados (McMM), enquanto no segundo foram instalados 4 implantes bicorticalizados (BcMM); foi modelada uma prótese total implantossuportada sobre cada modelo e aplicada uma carga axial total de 600N, distribuída nos dentes posteriores. Os modelos foram submetidos à análise de elementos finitos. Os resultados demonstraram que as maiores tensões de compressão se concentraram na região cervical dos implantes no McMM, (-32,562Mpa); já no BcMM, as tensões de compressão foram observadas nas corticais superior e inferior da mandíbula e aumento das tensões de compressão nos implantes distais (-63,792 Mpa). Com isso, concluímos as forças de carregamento axial apresentam-se melhor distribuídas pela estrutura óssea peri-implantar, em implantes monocorticalizados. e as tensões sobre o tecido ósseo, no BcMM, ocorrem nas regiões que circundam as regiões apicais e cervicais do implante. atróficas bicorticalização. bicorticalização . (bicorticalização) severa McMM , (McMM) BcMM (BcMM) 600N N posteriores finitos 32,562Mpa 32562Mpa Mpa 32 562Mpa (-32,562Mpa) 63,792 63792 63 792 (-63,79 Mpa. Mpa) apresentamse apresentam periimplantar, periimplantar peri implantar, implantar peri-implantar ósseo implante (bicorticalização (McMM (BcMM 3 (-32,562Mpa 63,79 6379 6 79 (-63,7 63,7 637 7 (-63, 63, (-63 (-6 (- (

Abstract Rehabilitation of edentulous atrophic mandibles involves the placement of implants in the anterior segment of the mandible. The primary stability of these implants can be improved using the base of the mandible as complementary anchorage (bicorticalization). This study aimed to analyze the biomechanics of atrophic mandibles rehabilitated with monocortical or bicortical implants. Two three-dimensional virtual models of edentulous mandibles with severe atrophy were prepared. Four monocortical implants were placed in one model (McMM), and four bicortical implants were placed in the other (BcMM). An implant-supported total prosthesis was prepared for each model. Then, a total axial load of 600 N was applied to the posterior teeth, and its effects on the models were analyzed using finite element analysis. The highest compressive stresses were concentrated in the cervical region of the implants in the McMM (-32.562 Mpa); in the BcMM, compressive stresses were distributed in the upper and lower cortex of the mandible, with increased compressive stresses at the distal implants (-63.792 Mpa). Thus, we conclude that axial loading forces are more uniformly distributed in the peri-implant bone when using monocortical implants and concentrated in the apical and cervical regions of the peri-implant bone when using bicortical implants. bicorticalization. bicorticalization . (bicorticalization) threedimensional three dimensional McMM, , (McMM) BcMM. BcMM (BcMM) implantsupported implant supported Then 60 teeth analysis 32.562 32562 32 562 (-32.56 Mpa Mpa) 63.792 63792 63 792 (-63.79 Mpa. Thus periimplant peri (bicorticalization (McMM (BcMM 6 32.56 3256 3 56 (-32.5 63.79 6379 79 (-63.7 32.5 325 5 (-32. 63.7 637 7 (-63. 32. (-32 63. (-63 (-3 (-6 (- (

Resumo Introdução a pandemia da Covid-19 e medidas de controle da sua expansão impactaram diferentes segmentos da economia, dentre eles os profissionais da Odontologia. Objetivo este trabalho analisou o impacto financeiro gerado pela pandemia da Covid-19 aos técnicos de prótese dentária (TPDs) no Brasil. Material e método por meio de um estudo transversal descritivo, aplicou-se aos TPDs do Brasil um questionário relacionado ao perfil sociodemográfico e profissional, impacto financeiro e medidas adotadas para minimizar seus efeitos. O questionário foi aplicado de forma on-line em redes sociais entre 27 de janeiro e 15 de fevereiro de 2021. Resultado demonstrou-se que 59,8% dos participantes eram do sexo masculino; 47,5% até 30 anos de idade e 57,3% com menos de 10 anos de prática. As medidas para contenção da propagação do coronavírus impactaram financeiramente 89,6% dos participantes; 72,0% interromperam totalmente seus trabalhos; 97,7% tiveram redução no faturamento; 98,2% tiveram mudança na rotina de trabalho; 94,8% tiveram aumento das despesas do laboratório no período; houve queda do faturamento para 41,2% entre 0% e 25,0% e para 36,3% entre 25,0% e 50,0%; 66,6% continuaram trabalhando durante a pandemia devido à sua situação financeira. Não pensaram em fechar seu laboratório de forma definitiva 71,8% dos participantes; 92,2% seguiram rotineiramente os cuidados de higienização e 21,6% fizeram uso das reservas financeiras. Conclusão os TPDs tiveram impacto financeiro durante o período da pandemia da Covid-19 causado principalmente pela diminuição da carga horária de trabalho, redução do faturamento e aumento do custo operacional devido à mudança na rotina de biossegurança.

Abstract Introduction the COVID-19 pandemic and measures to control its expansion impacted different segments of the economy, including dentistry professionals. Objective this study analyzed the financial impact of the COVID-19 pandemic on dental technicians in Brazil. Material and method this is a descriptive cross-sectional study with the application of a questionnaire of sociodemographic and professional profile, financial impact, and effect containment measures to dental technicians in Brazil. The questionnaire was applied online on social networks between January 27 and February 15, 2021. Result 59.8% of the participants were male, with 47.5% aged up to 30 years, and 57.3% with less than 10 years of practice. The measures to contain the spread of the coronavirus had a financial impact on 89.6% of the participants: 72.0% had their work completely interrupted, 97.7% had their billing reduced, 98.2% changed their work routine, and 94.8% had higher laboratory expenses in the period. Revenue decreased between 0% and 25.0% for 41.2% and between 25.0% and 50.0% for 36.3%. In addition, 66.6% continued working during the pandemic due to their financial situation. 71.8% of the participants did not consider closing their laboratory permanently, whereas 92.2% followed hygiene protocols routinely and 21.6% made use of their financial reserves. Conclusion dental technicians were financially impacted by the COVID-19 pandemic, mainly caused by fewer working hours, revenue reduction, and higher operating costs due to the change in the biosafety routine.

ABSTRACT Objective: To analyze whether children and their parents prefer a particular professional coat worn by the dentist and whether these preferences are influenced by their gender or level of anxiety. Material and Methods: Standardized images of male and female models dressed with different coats were shown to 400 pairs of 5-12 year-old children and respective parents and they were asked to point their preference. Information about child's dental experience was collected and children's anxiety level was obtained using the Children’s Fear Survey Schedule-Dental Subscale. Results: Both children (55.5%) and parents (76.5%) preferred a female professional over a male one. Children preferred the dentist wearing a white coat, while adults preferred the dentist wearing a colored coat (p<0.05). There was a tendency for the child to choose a dentist with the same gender as theirs, so boys chose more male dentists and girls more female dentists (p<0.05), but there was no difference between the choice of the dentist’s coat between boys and girls (p=0.53). Conclusion: Children have strong preferences in relation to the appearance of their dentists. Children and parents preferred female dentists, but there was a tendency to choose the dentist with the respondent’s gender. Contrary to popular belief, children preferred their dentists wearing the conventional white coat, different from their parents who preferred dentists wearing a colored coat.

Abstract Objective To compare periapical radiograph (PR) and cone-beam computed tomography (CBCT) in the diagnosis of alveolar and root fractures. Material and Methods Sixty incisor teeth (20 higid and 40 with root fracture) from dogs were inserted in 60 anterior alveolar sockets (40 higid and 20 with alveolar fracture) of 15 macerated canine maxillae. Each fractured socket had a root fractured tooth inserted in it. Afterwards, each maxilla was submitted to PR in two different vertical angulation incidences, and to CBCT imaging with a small field of view (FOV) and high-definition protocol. Images were randomized and posteriorly analyzed by two oral and maxillofacial radiologists two times, with a two-week interval between observations. Results Sensitivity and specificity values were good for root fractures for PR and CBCT. For alveolar fractures, sensitivity ranged from 0.10 to 0.90 for PR and from 0.50 to 0.65 for CBCT. Specificity for alveolar fractures showed lower results than for root fractures for PR and CBCT. Areas under the ROC curve showed good results for both PR and CBCT for root fractures. However, results were fair for both PR and CBCT for alveolar fractures. When submitted to repeated measures ANOVA tests, there was a statistically significant difference between PR and CBCT for root fractures. Root fracture intraobserver agreement ranged from 0.90 to 0.93, and alveolar fracture intraobserver agreement ranged from 0.30 to 0.57. Interobserver agreement results were substantial for root fractures and poor/fair for alveolar fractures (0.11 for PR and 0.30 for CBCT). Conclusion Periapical radiograph with two different vertical angulations may be considered an accurate method to detect root fractures. However, PR showed poorer results than CBCT for the diagnosis of alveolar fractures. When no fractures are diagnosed in PR and the patient describes pain symptoms, the subsequent exam of choice is CBCT.