The aim of this study was to evaluate the bond strength between the fibre post and root dentin after different cleaning protocols to remove eugenol from dentin. The residues and elemental composition of dentin were analysed using SEM and EDS. Bovine incisor roots were obturated with eugenol-based sealer. The post space was prepared, and the roots were divided into the following groups according to the cleaning protocol: unfilled (negative control), saline solution (positive control), 70% ethanol, acetone and 70% isopropyl alcohol. The fibre posts were cemented and push-out test realised. Chemical analysis of the dentin was performed using SEM and EDS. The bond strength values were analysed by anova/Fisher's and were as follows: negative control (7.30 ± 2.77) = 70% ethanol (6.64 ± 2.91) = 70% isopropyl alcohol (5.01 ± 3.15) = acetone (4.42 ± 1.53) >positive control (1.29 ± 0.56). It was concluded that 70% ethanol may be a good cleaning protocol to remove eugenol from dentin.
Aim:The aim of this study is to assess three protocols for removing a eugenol-based filling endodontic sealer from root dentin and the bond strength of fiberglass posts luted with resin cement. Materials and methods: Sixty single-rooted bovine teeth were prepared and filled with the Endofill endodontic sealer and gutta-percha cones. After 7 days, 9 mm of the filling was removed and divided into five groups (n = 12) according to the cleaning protocol: G1 (negative control), unfilled; G2 (positive control), saline solution; G3, 95% alcohol; G4, amyl acetate; and G5, Largo bur. The canals were hybridized and fiberglass posts were luted with resin cement. They were cross-sectioned in slices of 1 mm and subjected to the push-out test. The other samples were sectioned longitudinally and visualized in a scanning electron microscope (SEM), and the existing chemical elements were quantified by energy dispersive spectroscopy (EDS). The statistical analysis used variance analysis (ANOVA)-one way and Fisher's test, at a 5% significance level. Results: The 95% alcohol was more effective for cleaning the canal, resulting in a clean dentinal surface and bond strength statistically similar to the negative control. The Largo bur was also statistically similar to the negative control, with only a few debris impregnated on the wall. Amyl acetate showed more sealer residues on the canal walls, with a consequent lower bond strength value than the other groups, only higher than the positive control. Conclusion:The 95% alcohol and Largo burs may be used after removing the canal filling, so that the bond strength is improved when using the eugenol-based sealer.
Purpose This systematic review and meta‐analysis of in vitro studies compared the prepolymerized acrylic resin used for CAD/CAM complete denture manufacturing versus the heat‐polymerized acrylic resin for conventional complete dentures in terms of surface roughness, wettability, hardness and flexural strength. Materials and Methods An electronic search was performed in the PubMed, Embase, LILACS and Web of Science databases, without language or date restrictions. Gray literature and manual search tools were also used. The systematic review was carried out by two researchers independently, following the inclusion criteria: in vitro studies testing the CAD/CAM acrylic resin with a control group of heat‐polymerized acrylic resin which compared at least one of the four material properties above. The meta‐analysis was performed separately for each property, using a random effect model. Results Of the 914 studies found by means of search strategies, 698 were selected for the systematic review. After applying the eligibility criteria, only 17 articles were selected for the qualitative analysis in the systematic review; among these, 14 were included in the quantitative meta‐analysis. The CAD/CAM prepolymerized acrylic resin in blocks had similar properties when compared to heat‐polymerized acrylic resin in almost all outcome measures, with the exception of a statistically significant reduction in surface roughness. Conclusions Based on the findings of this systematic review and meta‐analysis, equally satisfactory results can be expected from dental prosthesis manufactured by the CAD/CAM system when compared to conventional ones, with the additional potential of reducing the pigmentation and attached microorganisms due to the reduced surface roughness of the prepolymerized resin.
A reabilitação oral requer dos profissionais da odontologia um planejamento cuidadoso e eficaz, visando reabilitar o paciente funcional e esteticamente com intuito de buscar o equilíbrio do sistema estomatognático. Objetivo: Relatar um caso clínico de um paciente com disfunção temporomandibular associada ao bruxismo. Relato de caso: Paciente, Z.S.B., 59 anos, gênero masculino, compareceu na clínica integrada do Curso de Odontologia da Universidade Regional de Blumenau (FURB) com queixa de dor muscular facial ocasionando desconforto mastigatório e desgastes excessivos nos dentes anteriores prejudicando a estética. A reabilitação foi iniciada através da utilização prévia de “front plateu”, confecção de Jig de Lucia, registro da relação cêntrica e montagem em Articulador Semi-Ajustável, confecção de prótese parcial removível provisória, após enceramento de diagnóstico com reconstrução das guias anterior e caninas, a qual foi utilizada por um mês. Considerações finais: Após desaparecimento da sintomatologia dolorosa finalizou-se o caso com resinas compostas anteriores baseadas no enceramento de estudo, confecção de prótese parcial removível definitiva e utilização de placa oclusal contribuindo para manutenção do tratamento realizado.
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