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Effect of Addition of Dimethyl Sulfoxide to Simplified Adhesives on Dentin Bond Durability after Three Years of Water Storage

Abstract:

Purpose: To evaluate the effect of inclusion of two dimethyl sulfoxide (DMSO) concentrations in simplified etch-and rinse adhesives on dentin bonding durability after three years of water storage. Materials and Methods Forty-two caries-free third molars were divided into six experimental groups (n = 7) accord ing to the following factors: 1) adhesive (Adper Single Bond 2 [SB], 3M Oral Care; Prime&Bond 2.1 [PB], Dentsply Sirona); 2) concentration of DMSO (control group: 0.0% DMSO; addition of 0.2% DMSO [0.2] and 2% DMSO [2.0]). After completing restoration, specimens were stored in water (37ºC) for 24 h, sectioned into adhesive-dentin sticks (0.8 m ), tested for microtensile bond strength (μTBS) at 0.5 mm/min, and examined for nanoleakage (NL) using SEM immediately thereafter or after three years of water storage. Data were subjected to a three-way repeated-measures ANOVA and Tukey’s test ( 0.05) for each property evaluated. Results After three years of water storage, for both adhesives, the incorporation of 2% DMSO maintained the μTBS when compared to immediate μTBS (p 0.05). In general, SB resulted in a statistically significantly higher mean of μTBS compared to PB, independent of the DMSO concentration after water storage (p 0.05). Further more, the amount of NL was lower and practically limited to the hybrid layer given the concentrations of 0.2% and 2% DMSO for both tested adhesives after three years. Conclusion The incorporation of DMSO in simplified etch-and-rinse adhesives maintains the long-term stability of the dentin bond