Análise das tensões em protocolos mandibulares sustentados por três implantes com diferentes inclinações do implante distal

Abstract

Posterior regions rehabilitation with full fixed prosthesis due to cantilever extension is critical bone / implant interface stress distribution. This study evaluated the stresses induced in periimplant mandibular full fixed prosthesis by distinct designs. Six photoelastic models with 5 or 3 implants were fabricated, simulating edentulous mandible. Control group (C) received 5 upright implants and other models received 3 implants ranging the distal abutment straight(S) or angled (A) and the distal tilt implant 0°, 17° or 30°. Vertical loads were applied at two points of the framework: the distal implant and the final of cantilever. Twenty points were determined around near implant of the loading for stresses calculation. Statistical analysis was performed by ANOVA and Tukey\'s B test ( = 0.05). For the cantilever loading was not found statistical difference between groups (p = 195). Under distal implant loading the groups S17 and S30 were significantly higher than the group C (p = 0.000). The group C showed better results in both loading types, angled abutments not had higher stress levels in both loading types, cantilever length reduction and distal tilted implants were not significant at the final cantilever loading, the stress values were higher at the final cantilever loading than the distal implant loading.