Introduction:A significant number of endodontically treated teeth restored with posts have associated periapical lesions, and several authors have discussed the probable causes of the development of these. Attention has been focused on restorative procedures performed after endodontic treatment and their association with the prognosis of endodontic therapy because a number of root-filled teeth will require post- and core-retained restorations.Purpose:The purpose of this study was to evaluate, by examination of periapical radiographs, whether the placement of intra-radicular posts in endodontically treated teeth may act as a risk factor for development of periapical lesions.Material and Methods:This case-control study analyzed periapical radiographs of 72 endodontically treated teeth with coronal restorations. All radiographs were obtained from a single private practice. Specimens were assigned to 2 groups: Group 1 (control) was composed of teeth without periapical lesions and Group 2 (case) was composed of teeth with periapical lesions. The number of teeth with and without posts in each group was recorded. Three calibrated examiners analyzed the radiographs visually under X4 magnification.Results:In Group 1, 28 (65.1%) out of 43 teeth were restored with posts. In Group 2, 24 (82.8%) out of 29 teeth had intra-radicular posts. The interpretation of chi-square test showed that these percentages were not significantly different (x2=2.687; p=0.101). Odds ratio was 2.571 (0.8158.118), which indicates that there was no statistically significant association between periapical lesions and posts.Conclusion:Intra-radicular posts placed in endodontically treated teeth were not a significant risk factor for development of periapical lesions in the practice where the cohort of patients was treated.

Introduction: The term cracked tooth syndrome refers to an incomplete fracture of a vital posterior tooth that involves the dentin and occasionally extends into the pulp. There is a very limited number of publications trying to model dentin crack growth using numerical techniques. Therefore, it is essential to numerically model this phenomenon in order to improve the clinical procedures. Methods: A 2D finite element model is proposed to simulate crack initiation and propagation in a restored premolar tooth. The geometric model was based on computed tomography data. A special finite element technique, named mesh fragmentation technique, is used to model and analyze the behavior of the tooth. This technique was used to model cracks in quasi-brittle materials based on the use of interface solid finite elements with high aspects ratio. A tension damage constitutive relation between stresses and strains consistent with the continuous strong discontinuity approach is used to describe crack formation and propagation. Results: The main aspects of modeling technique and procedures are explained in detail as well as the whole results, including both elastic and fracture analyses of the restored tooth. Conclusion: The results of the current fracture analysis show that, under various loading conditions, there is no crack initiation in the restored tooth under typical loading magnitude. However, in the case of tooth with a pre-existing crack, which can be aroused during the restoration process, a crack propagation was observed, while they did not reach a critical fracture state.

Objective The bleaching agents may interact with restorative materials, such as dental amalgam, providing an increase mercury ions (Hg) release, whose toxic effect is known. Whereas many patients have amalgam restorations (AR) and seek bleaching treatments, the present study aimed to evaluate in vitro the amount of Hg released from AR made with spherical alloy, after being subjected to different concentrations of carbamide peroxide (CP) for home bleaching. Methods 40 class I AR were prepared in bovine teeth. Afterthe restoration, the samples were randomly allocated into 4 groups (n = 10): C (control group), CP10 (CP 10%) CP15 (CP 15%) CP20 (CP 20%) and its treatments were simulated for 14 days for 6 hours daily. The Hg ions released was measured by energy dispersive X-ray spectroscopy (EDS) and surface changes were assessed in the Scanning Electron Microscope (SEM). Hg levels (percent mass) were recorded and the differences were statistically analyzed using the Kruskal-Wallis test and Dunn’s “Post hoc” test. Results Statisticalanalysis showed the bleaching treatment resulted in a higher Hg release (p <0.05), although no visible changes were identified in micrographs when comparing the control group with the other groups (CP10, CP15, CP20). Conclusion Increased Hg release may be observed during simulated home bleaching.

Desde a sua regulamentação profissional, a Odontologia passou por muitas mudanças até sua consolidação. O aumento indiscriminado e sem planejamento da oferta de cursos de Odontologia resultou em um crescimento exagerado do número de profissionais no mercado de trabalho, culminando no atual momento de saturação e de acelerada reorganização do curso. Tais mudanças não se limitaram ao desenvolvimento tecnológico e científico. Observou-se, também, alteração no perfil do estudante e do profissional de odontologia no decorrer deste percurso, portanto essa pesquisa tem o objetivo de conhecer o perfil da força de trabalho dos profissionais graduados e verificar a inserção regional do Curso de Odontologia da Universidade Federal do Espírito Santo (UFES). Este estudo quantitativo de natureza descritiva e exploratória analisou o perfil profissional e sociodemográfico de 533 egressos do Curso de Odontologia da UFES entre 2008 e 2018, a partir do banco de dados do Conselho Regional de Odontologia do Espírito Santo e do DATASUS. Como resultados observou-se uma maioria feminina (70%), com idade entre 25-40 anos, ativos na Odontologia (85,1%), atuando no estado no setor privado. A maioria é formada por clínicos gerais (65,2%), mas existe uma tendência à especialidade que, quando presente, concentra-se na Ortodontia, Endodontia, Prótese e Implantodontia. Os resultados confirmaram a importante inserção regional do Curso de Odontologia da UFES no desenvolvimento local. Entretanto, apesar das Diretrizes Curriculares Nacionais direcionarem para um perfil generalista, voltado para a coletividade, constata-se maior tendência ao mercado privado, possivelmente pelos honorários mais atrativos.

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