RESUMO
AIM AND OBJECTIVE: This study aims to evaluate the effect of different resin cements on the bond strength (BS) of custom-made glass fiber posts (GFPs) using the push-out test. MATERIALS AND METHODS: Twenty-four uniradicular bovine teeth were selected. The crowns were sectioned at the cementoenamel junction, and the root canals were treated. The post spaces of the teeth were prepared to a length of 12 mm to receive a GFP. The specimens were randomly assigned to three experimental groups (n = 8), according to the resin cement used to fix the GFPs: RelyX U200 (U200), Allcem Core (ACC), and Allcem Dual (ACD). Each specimen was sectioned into six slices per root third (cervical, middle, and apical), which were subjected to the push-out test. BS values were calculated and compared using the Kruskal-Wallis and Friedman tests. RESULTS: There were significant differences in the middle third, according to the resin cement type used (p < 0.05). ACD showed lower BS values (p < 0.05). Significant differences were observed for ACD among the thirds of the slices, with the lowest values also observed for the middle third (p < 0.05). CONCLUSION: The present study shows that ACC and U200 showed higher BS values compared with ACD, and were also less influenced by the depth of the root dentin. CLINICAL SIGNIFICANCE: The restoration of endodontically treated teeth is a challenge in dentistry, and, in most cases, will require installation of fiberglass pins. In this respect, several types of resin cements are indicated for cementation of these pins; for this reason, their adhesiveness must be adequately investigated. Conventional cements and self-adhesive cements have shown satisfactory performance in cementing the custom-made GFPs, thereby making these cements satisfactory clinical choices. The present study suggests that ACD had lower performance than the other two cements evaluated.
Assuntos
Colagem Dentária , Técnica para Retentor Intrarradicular , Animais , Bovinos , Cavidade Pulpar , Análise do Estresse Dentário , Dentina , Vidro , Teste de Materiais , Cimentos de ResinaRESUMO
OBJECTIVES: The concept of vertical dimension of occlusion (VDO) refers to a measure in the vertical plane that establishes the relation between the maxilla and the mandible when the posterior teeth, both from the maxillary and from the mandibular arches, are occluded, regardless of whether they are natural or prosthetic, healthy or restored. This measure is subject to change, and when this occurs, it can compromise both the function and the facial aesthetics. This study proposed to develop a methodology based on cephalometric analysis by studying the 31 lateral teleradiographs of adult, dentate individuals to determine the VDO, based on bone structures that are not dependent on the presence or absence of posterior teeth. The final goal was to make this application accessible to individuals who have undergone alterations of the lower portion of the face. MATERIALS AND METHODS: The cephalometric analysis of this study, called Seraidarian-Tavano, was verified through facial angles (upper and middle angles) that, when correlated, determine the lower position of the face. RESULTS: The analysis of results showed that no statistically significant difference between the angles studied could be observed (superior angle 50.29 ± 3.35 e median angle 49.95 ± 3.37). In the same manner, no variation in the results regarding gender in the measure of these angles could be observed. CONCLUSION: This cephalometric analysis can be applied to determine the VDO, regardless of the presence or absence of posterior teeth.
Assuntos
Cefalometria/métodos , Dimensão Vertical , Adolescente , Adulto , Cefalometria/estatística & dados numéricos , Queixo/anatomia & histologia , Arco Dental/anatomia & histologia , Meato Acústico Externo/anatomia & histologia , Feminino , Humanos , Masculino , Mandíbula/anatomia & histologia , Côndilo Mandibular/anatomia & histologia , Maxila/anatomia & histologia , Pessoa de Meia-Idade , Osso Nasal/anatomia & histologia , Órbita/anatomia & histologia , Projetos Piloto , Fossa Pterigopalatina/anatomia & histologia , Adulto JovemRESUMO
Durante a formação e desenvolvimento da porção timpânica do osso temporal, podemos verificar a presença de um forame na regiäo central da parede posterior da fossa articular (parede anterior do meato acústico externo). Este forame (forame de Huschke) está presente em todos os indivíduos, e sua luz oblitera-se por um processo natural de calcificaçäo ao redor dos 5 anos de vida, podendo persistir, em uma porcentagem da populaçäo, na idade adulta. A persistência do forame de Huschke foi relatada por diversos autores como sendo possível etiologia de diversas alteraçöes, distúrbios e patologias relacionadas com as articulaçöes temporomandibulares (ATM), ouvidos e estruturas adjacentes. Tendo em vista suas implicaçöes e importância clínica, torna-se fundamental que profissionais da saúde que atuam nestas regiöes reconheçam as conseqüências da presença e persistência do forame de Huschke