Análise de tensões em pilares de próteses implantossuportadas em função da sequência de aparafusamento e do torque progressivo

• Autor(a) principal: Barcellos, Leonardo Hoffmann de
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional PUCRS
• Texto Completo: http://hdl.handle.net/10923/438
• topic: ODONTOLOGIA; PRÓTESE DENTÁRIA; IMPLANTODONTIA; BIOMECÂNICA

The aim of this study was to evaluate the influence of four screw tightening sequences and the mode of torque application on the residual tension in a simulation of full-arch mandibular prosthesis supported by five implants. Four metallic frameworks were fabricated, and strain gauges were attached to the implant abutments in order to measure the generated tensions on the implant-framework system during the experiments. The screw-retained frameworks were fixed with a 10 N. cm torque using four different screw tightening sequences: I) 2-4-3-1-5; II) 1-2-3-4-5; III) 3-2-4-1-5; and IV) 2-5-4-1-3. The same sequences were repeated in each framework using a progressive torque method, firstly with a 5 N. cm torque in each screw, followed by a 10 N. cm torque. Data were analyzed by ANOVA for repeated measures and effect size test. No statistically significant differences in tension were found among the different screw tightening sequences. For the different methods for applying prosthetic screw torque, only one sequence (3-2-4-1-5) showed statistically significant difference in tension. The use of other screw tightening sequences did not yield significant differences in tension for either the directly applied torque or the progressive torque.