Resistência à flexão do conjunto implante/pilar em função da geometria e tipo de superfície do parafuso do pilar

Abstract

The purpose of this study was to analyze the influence of the configuration and solid lubricant presence in the screw of pillar in the resistance to the flexão of compatible the Branemark® implantation. Forty pillars of the type universal trunnion had been connected the implantations with regular external hexagonal junction 4.1mm by means of 40 hexagonal screws, divided in four groups (n=10): FE (titanium screw tilted with thread in the extremity), LE (screw of titanium with solid lubricant and thread in the extremity), FT (titanium screw tilted with thread in all the length) and LT (screw of titanium with lubricant and thread in all its length). By means of the mechanical assay of flexão, the resistance of the system has implanted/pillar was evaluated, with load applied perpendicularly to the long axle of the implantation, in machine of mechanical assay (EMIC) under speed of 0,5mm/min. The data had been grouped and submitted the symmetry test. Test distribution free of Kruskal-wallis (P< was used; 0,05), and after that of Mann-whitney U to verify between which groups had difference. The results had statistical demonstrated to significant differences between the groups FE with excessively, being that FE presented the lowest values. Group LE presented statistical resulted better that LT. Ahead of the limitations of this work pose to conclude that it enters screws only tilted, of thread in all its extension provided to greater rigidity of the set, while between screws contends lubricative thread solid in all its length provided to minor rigidity of the joint implantation/pillar/screw that of threads only in the extremity.