Análise da resistência de união de cimento resinoso à dentina radicular de diferentes sistemas de pino de fibra de vidro por teste de micropush-out

Abstract

The research of cementitious materials and diferent proposals of fiberglass posts is necessary in order to validate their effectiveness, avoiding failures and ensuring the success of the procedure. The aim of this study was to evaluate the bond stength of a cement to the bovine root dentin in different fiberglass post systems by means of micropush-out test in three different root depths (cervical, middle and apical third). Thirty bovine incisor teeth were treated endodontically, and divided into three groups (n=10): G1 – Resin cement Rebilda DC + Fiberglass post Rebilda Post, G2 – Resin cement Rebilda DC + Fiberglass post Rebilda Post, refilled with composite resin GrandioSO e G3 – Resin cement Rebilda DC + Fiberglass post Rebilda Post GT. After the endodontic and cementation stages of the posts, teh specimens were sectioned in 1 mm discs per region. The discs were tested using a micropush-out mechanical test and the data analyzed by the ANOVA two way and Tukey. It was concluded that the depth os the thirds interfered negatively in the bond strength of the cement used, however the post systems didn’t have significant interference in the bond strenght of the cement.