In Vitro Effect of Warm Air Stream Solvent Evaporation Method on Microtensile Bond Strength of the Fifth Generation Adhesive Systems

Objectives This study aimed to evaluate the effect of warm air solvent evaporation on microtensile bond strength of composite restorations bonded with fifth-generation adhesive systems. Methods Twenty-four sound human molars were randomly assigned into two groups according to the type of bonding adhesive used: Adper Single Bond (3M ESPE, USA) or Solobond M (VOCO, Germany) (N = 12). Subsequently, each group was randomly divided into three subgroups according to the solvent evaporation time (0, 5, and 20 minutes). Composite build-ups were conducted incrementally on the dentin substrate fixed in a circular mold. Micro-tensile bond strength evaluation was conducted using the Isomet microtensile machine. Statistical analysis was performed using one-way ANOVA, Tukey’s, and Student’s t-test at p<0.05. Results At 20 minutes, Maximum and minimum microtensile bond strength were observed in Adper single bond and Solobond M , respectively. The mean microtensile bond strength of Adper single bond and Solobond M adhesives during 20 minutes of solvent evaporation were significantly different (p < 0.05). Conclusion In both ethanol and water-based adhesives, increasing the solvent evaporation time enhanced the microtensile bond strength. In contrast, in acetone-based adhesives, the optimum amount of solvent with other components must be present in the bonding solution to maintain bonds