Força e momento fletor em pilares de prótese tipo protocolo Branemark em função da inclinação dos implantes distais e do número de pilares

• Autor(a) principal: Naconecy, Marcos Michelon
• Data de Publicação: 2006
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional PUCRS
• Texto Completo: http://hdl.handle.net/10923/381
• topic: ODONTOLOGIA; IMPLANTODONTIA; PRÓTESE DENTÁRIA

This in vitro study evaluated the distribution of bending moments, compressive and tensile forces in abutments of Brånemark protocol prostheses, as a function of the inclination of the distal implants (straight or tilted) and the number of abutments (three, four, or five). Specimens were ten metallic bar structures cast in Pd-Ag alloy, simulating Brånemark protocol prostheses supported by five implants. These structures were made over two master models: one model with parallel and straight implants (n = 5) and one model with the distal implants tilted (n = 5). Strain gauges were fixed on the abutments of each master model to measure the deformation when a static load of 50 N was applied on the cantilever (15 mm) of each specimen. The deformation values were measured when the metallic bars were tested over three, four, or five abutments in the two master models. The deformation values were transformed into force and bending moment values and analyzed by ANOVA for randomized blocks design, followed by Tukey's test multiple comparisons, at the 5% level of significance. Abutment #1 (adjacent to cantilever under load) had the highest values of force and saggital bending moment for all tests with three, four, or five abutments. Independently from the number of abutments, the force in abutment #1 was higher in the straight model than in the tilted model. Total moment was higher with three abutments than with four or five abutments. Independently from the inclination of implants, the mean force with four or five abutments was lower than with three abutments. The results suggest that the inclination of posterior implants allow better distribution of axial forces and bending moments in abutments of Brånemark protocol prostheses supported by four or five abutments in comparison with the use of only three abutments.