142 resultados para Marginal misfit


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Este livro traz reflexões a partir de ideias e teorias produzidas e difundidas pelo Núcleo de Estudos de Direitos Alternativo (Neda) e pelo Núcleo de Estudos da Tutela Penal e Educação em Direitos Humanos (NETPDH), ligados à Faculdade de Ciências Humanas e Sociais da Unesp, em Franca. Ambos os grupos são reconhecidos nos meios acadêmicos do Direito por desenvolverem uma visão crítica acerca de tutela penal, que seria permeada pela seletividade e desproporcionalidade, além de provocar estigmatização, reunindo, assim, traços marcantes do sistema penal brasileiro. De acordo com o prefácio do professor de Direito Penal e Criminologia da Unesp, Paulo César Corrêa Borges, o autor, Roberto Galvão Faleiros Junior, apresenta aqui reflexões da criminologia crítica que estabelecem uma compreensão conjuntural dos sistemas penais (particularmente o do Brasil).Tais reflexões indicam, segundo Borges, proposições concretas para a instrumentalização democrática do direito penal na América Latina, levando em conta os pressupostos materiais, históricos e dialéticos comprometidos com a formulação de concepções a partir das classes subalternas e marginalizadas, mas também com limitações referentes à compreensão dos direitos humanos

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Pós-graduação em Odontologia Restauradora - ICT

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Pós-graduação em Odontologia Restauradora - ICT

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Purpose: This study aimed to evaluate the role of the implant/abutment system on torque maintenance of titanium retention screws and the vertical misfit of screw-retained implant-supported crowns before and after mechanical cycling. Materials and Methods: Three groups were studied: morse taper implants with conical abutments (MTC group), external-hexagon implants with conical abutments (EHC group), and external-hexagon implants with UCLA abutments (EHU group). Metallic crowns casted in cobalt-chromium alloy were used (n = 10). Retention screws received insertion torque and, after 3 minutes, initial detorque was measured. Crowns were retightened and submitted to cyclic loading testing under oblique loading (30 degrees) of 130 +/- 10 N at 2 Hz of frequency, totaling 1 x 10(6) cycles. After cycling, final detorque was measured. Vertical misfit was measured using a stereomicroscope. Data were analyzed by analysis of variance, Tukey test, and Pearson correlation test (P < .05). Results: All detorque values were lower than the insertion torque both before and after mechanical cycling. No statistically significant difference was observed among groups before mechanical cycling. After mechanical cycling, a statistically significantly lower loss of detorque was verified in the MTC group in comparison to the EHC group. Significantly lower vertical misfit values were noted after mechanical cycling but there was no difference among groups. There was no significant correlation between detorque values and vertical misfit. Conclusions: All groups presented a significant decrease of torque before and after mechanical cycling. The morse taper connection promoted the highest torque maintenance. Mechanical cycling reduced the vertical misfit of all groups, although no significant correlation between vertical misfit and torque loss was found.

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Objectives: To determine the marginal adaptation of bulk-fill composites in class II MO cavities.Methods: Standardized class II MO cavities with bevelled enamel margins were prepared in 40 extracted human molars. The teeth were randomly assigned to one of the five experimental groups (n = 8). The teeth were restored with two horizontal increments of composite (4 mm and 2 mm thickness). The experimental groups were (1st/2nd increment): Gr. A - Venus Bulk-Fill/Venus Diamond; Gr. B - Tetric EvoCeram BulkFill/Tetric EvoCeram; Gr. C - Surefil SDR/Ceram-X; Gr. D - SonicFill; Gr. E - Ceram-X/Ceram-X (control). After finishing procedures, impressions were made using a polyvinyl siloxane and epoxy resin replicas were obtained. Thermo-mechanical stressing was carried out 24 h after the restorative procedure. All specimens were submitted to 240,000 occlusal loading and simultaneous 600 thermal cycles in water at 5 degrees C and 50 degrees C. After loading, a new set of epoxy resin replicas was obtained. Scanning electron microscopy was carried out at 200x magnification. Results for the marginal adaptation were expressed as percentages of continuity relative to the exposed interface and analyzed by ANOVA and Duncan post hoc test (p < 0.05).Results: In enamel, no significant differences were detected before and after thermo-mechanical loading between groups. In dentine, the worst results were observed in Gr. A.Conclusion: By applying simple layering techniques, bulk-fill materials do not allow better marginal adaptation than a standard composite. Clinical significance: A new class of resin-base composite (bulk-fill) was recently launched on the market. The bulk-fill composites exhibited adequate marginal adaptation and similar to the results of the standard composite. (C) 2014 Elsevier Ltd. All rights reserved.

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