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

This study aimedto evaluate the effect of warm air solvent evaporation on microtensile bond strength of composite restorations bonded with fifth-generation adhesive systems.

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 dividedinto three subgroups according to the solventevaporation 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 analysiswasperformed usingone-way ANOVA, Tukey’s, and Student’s t-testat p<0.05.

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 weresignificantlydifferent(p < 0.05).

In both ethanol and water-based adhesives, increasing the solvent evaporation time enhancedthe microtensilebond strength. In contrast, in acetone-based adhesives, the optimum amount of solvent with other componentsmust be present in the bonding solution to maintain bonds