Análise de tensões geradas por implantes de diâmetro largo e junções hexagonal externa, hexagonal interna e cônica interna

Abstract

The biomechanic limitations of the dental implants have been widely studied and one of the attempts presented by the companies was the change the shape of the abutment/implant junction, with the aim to improve the stress distribution. Therefore, the proposal of this study was to load obliquely three junctions presented commercially as more efficient than the conventional external hexagonal junction, for substitution of teeth that will receive this type of loading, verifying the hypothesis that one presents better stress distribution that the others. The analyzed junctions had been: external hexagonal (Lifecore type), internal hexagonal (Frialit type) and internal taper (Ankylos type). The technique of photoelasticity in two-dimensional plane stress was used to analyze the state of stress generated in 21 points next to the implants of each group (n=4), submitted to oblique loading. The value of the area under the graph of shear stress of the 21 points of each analyzed model was submitted to the statistical test of Kruskal-Wallis (p<0,05) showing no statistically significant difference between the groups (p = 0,058). It can be concluded that all the evaluated junctions had presented similar behavior under oblique loading, being the three junctions capable to substitute teeth that receive this type of loading.