Long-term effect of ethanol on the bond strength of fiber-glass posts to root dentin ; Efeito em longo prazo da aplicação de etanol na resistência adesiva de pinos de fibra de vidro cimentados à dentina radicular

Objective: To evaluate the long-term effect of ethanol (EtOH) application on the bond strength of adhesive systems used in post luting to root dentin.Methods: Bovine roots (n=40) had their root channel prepared for post luting and were etched with 37% phosphoric acid (15 s). Specimens were distributed according to adhesive system and EtOH application. Control groups received only the application of adhesives Adper ScothBond Multi-Purpose Plus (ASb), ou Adper Single Bond (SB). Experimental groups received previous EtOH application for 1 minute (EtOH+ASb and EtOH+SB groups). After fiber glass post luting, specimens were stored for 24 h, or 12 months, and later subjected to push-out test (n=5). Data were analyzed by three-way analysis of variance and Tukey test (α<0.05).Results: The EtOH application did not influence the bond strength values in immediate evaluation (24 h), regardless of the adhesive system used (p>0.05). After 12 months, it was observed significant statistically reduction of adhesive resistance (p<0.05); however the EtOH+SB group did not presented statistical difference between the evaluated storage periods (p>0.05).Conclusion: EtOH pre-treatment contributes to maintain the long-term bond strength, when water and ethanol-based adhesive system is used. ; Objetivo: Avaliar o efeito em longo prazo da aplicação de etanol (EtOH) na resistência adesiva de sistemas adesivos utilizados na cimentação de pinos à dentina radicular.Métodos: Raízes bovinas (n=40) tiveram o canal radicular preparado para receber pino, sendo realizado o condicionamento com ácido fosfórico 37% (15 s). Os espécimes foram distribuídos de acordo o sistema adesivo e aplicação de EtOH. Grupos controles receberam apenas aplicação dos adesivos Adper ScothBond Multi-Purpose Plus (ASb), ou Adper Single Bond (SB). Grupos experimentais receberam aplicação prévia de EtOH durante 1 minuto (EtOH+ASb e EtOH+SB). Após a cimentação, os espécimes, foram armazenados por 24 h, ou 12 meses, sendo submetidos ao teste push out (n=5). Os ...