Influence of simplified surface treatments protocols on the bond strength between resin cements and reinforced glass-based ceramics

• Autor(a) principal: Llerena Icochea, Alfredo Esteban
• Data de Publicação: 2021
• Tipo de documento: Tese
• Idioma: eng
• Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
• Texto Completo: https://www.teses.usp.br/teses/disponiveis/25/25148/tde-11112021-103314/
• topic: Cerâmica; Ceramics; Cimentos dentários; Dental cements; Resistência ao Cisalhamento; Shear strength

A correct surface treatment protocol for ceramics is a very important step in the cementation process and it may influence the final bond strength performance. In these two studies, the aim was to evaluate the influence of simplified silica-based ceramic surface treatments on the shear bond strength with resin cements. Zirconium-reinforced lithium silicate and lithium disilicate slices were obtained and submitted to different surface treatments protocols. Hydrofluoric acid (HF) and ammonium polyfluoride (MBEP) were used in both studies for topographic surface alteration and then combined with different adhesive materials and protocols for a possible potentialization of the final bond strength. One of the studies used thermocycling before the microshear bond strength (SBS) evaluation. Failure mode was analyzed with a stereoscopic loupe. In the first study, groups that used HF and MBEP resulted in a significantly higher SBS than did the group without any treatment. There were significant differences in SBS values between groups of different resin cements for HF-etched and silane or MBEP and resin cement (regardless of adhesive application) to ceramic surfaces. In the second study, the main focus were the utilization or not of an extra adhesive layer after silane application and there were not found differences with the use or not of this extra clinical step. Ammonium polyfluoride (MBEP) seems to be stable and comparable to the conventional protocol with hydrofluoric acid and silane on a ceramic surface based of zirconium-reinforced lithium silicate and the application or not of an extra adhesives layer did not influence positive or negatively the final bond strength between a light cured resin cement and the silica-based ceramic surface.