Influência de diferentes retentores intra- radiculares na deformação de dentes tratados endodonticamente frente ao teste de impacto

Abstract

The aim of this study was to evaluate the influence of different post in a strain behavior of endodontically treated teeth on impact test. Forty bovine incisor roots with 15 mm in length were selected, treated endodontically and included in resin cylinders with simulated periodontal ligaments. The roots were randomly divided into two groups (n = 20) according to the type of post to be restored: Cast post and core (Cpc) and Glass fiber post (Gfp). Once restored, the roots were stored under constant refrigeration and then the coronal portion of post were molded for making crowns made of Ni-Cr alloy. Strain gauges were attached at the bucal surface of the root portion and subjected to the impact test. A pendulum device similar to the conventional Charpy impact test was used, it were performed using two different angles: 90 º and 45º (n = 10) at the center of the buccal crown. The strain was calculated and data were analyzed with 2-way ANOVA (α = 0.05). The results showed no statistically significant difference (P = 0.151) used to post (Cpc and Gfp). There was not a statistically significant difference (P = 0.268) for the types of angles used in the study (90º and 45º). There was not a statistically significant interaction between post and use the angle of the impact test (P = 0.478). In conclusion, there was no substantial difference in peak strains among the different post and impact angles.