Resistência à flexão de diferentes sistemas de pinos de fibra de vidro personalizados

Abstract

The objective of this work was to compare the flexural strength of conventional fiberglass posts relined with composite resin to custom adjustable posts and single-body fiberglass posts milled in CAD-CAM. Thirty specimens (n=10) were made with the following retainers: (1) PCM - prefabricated fiberglass posts (Exact no. 2 - Angelus®, Londrina, PR, Brazil) relined with composite resin; (2) PFF - pins milled in CAD-CAM from a Fibercad wafer (Fibercad - Angelus®, Londrina, PR, Brazil); and (3) PPA -adjustable custom pins (Splendor SAP - Angelus®, Londrina, PR, Brazil). The specimens were submitted to the three-point bending test, in a universal testing machine, with a load cell of 2,000 N, which focused its force on the center of the specimens, at a speed of 0.05 mm /min. Mean resistance values were compared between groups, using the 1-factor Anova and Tukey tests, at a significance level of 95%. The results showed that the PFF group presented a superior flexural resistance to the PPA and PCM groups (p=0.000). The PPA and PCM groups did not show statistical differences between them. In conclusion, the pins milled in CAD-CAM (PFF) are the ones that most resist a flexural force among the three materials tested in the experiment.