Adhesive strength of fiberglass posts treated with thio-urethane-based experimental silanes

Abstract

PurposeThe aim of this study was to evaluate the adhesive bond strength of fiberglass poststreated with experimental silanes based on thio-urethane and submitted to thermoand mechanical cycles.Materials and MethodsBovine roots were divided into six groups: RX-RU2 (RelyX CP + RelyX U200); PETMPHDDI-RU2 (PETMP-HDDI + RelyX U200); PETMP-BDI-RU2 (PETMP-BDI + RelyXU200); RX-RU (RelyX CP + RelyX Ultimate); PETMP-HDDI-RU (PETMP-HDDI + RelyXUltimate); PETMP-BDI-RU (PETMP-BDI + RelyX Ultimate). One slice from each rootthird (n=10) was submitted to the push-out test and the values evaluated with RProgram statistical analysis, while the failure pattern assessed in percentage.ResultsAmong root thirds, RX-RU2 promoted greater strength at the cervical and apicalthirds; PETMP-HDDI-RU2 showed highest values at the three thirds; and PETMPBDI-RU2 was strongest at the apical third. RX-RU presented higher strength at theapical third, and PETMP-HDDI-RU and PETMP-BDI-RU had similar values at the threethirds. In each root third, PETMP-HDDI-RU2 showed similar strength at all thirds,and similar strength at the apical third was observed for other associations. Mixedand adhesive failures predominated.ConclusionExperimental silanes promoted different bond strength values in the adhesion offiberglass posts to the root thirds, with better results for PETMP-HDDI silane. Theroot region did not influence the failure pattern and most slices showed mixed(MCDP) or adhesive (ADP) failure.