In‐vitro comparison of the effect of different bonding strategies on the micro‐shear bond strength of a silorane‐based composite resin to dentin

The current study evaluated the micro‑shear bond strengths of a new low‑shrinkage composite resin to dentin.
In this in‑vitro study, 70 extracted premolars were assigned to one of seven groups (n = 10): Group 1: OptiBond Solo Plus (Opt; Kerr); Group 2: SE Bond (SE; Kuraray); Group 3: Silorane System Adhesive (SSA; 3M ESPE); Group 4: OptiBond Solo Plus LS Bond (Opt LS); Group 5: SE Bond LS Bond (SE LS); Group 6: OptiBond Solo Plus (Opt Po); and Group 7: SE Bond (SE Po). Occlusal dentin was exposed and restored with Filtek LS (3M ESPE) in groups 1 to 5 and Point 4 (Kerr) in groups 6 and 7. After thermocycling (1000 cycles at 5/55°C), micro‑shear bond test was carried out to measure the bond strengths. The results were submitted to analysis of variance and post hoc Tukeytests (P Two‑way ANOVA showed no significant differences between the two types of composite resin (P = 0.187), between bonding agents (P = 0.06) and between composite resin and bonding agents (P = 0.894). Because P value of bonding agents was near the significance level, one‑way ANOVA was used separately between the two composite groups. This analysis showed significant differences between silorane composite resin groups (P = 0.045) and Tukey testshowed a significant difference between Groups 4 and 5 (P = 0.03).
The application of total‑etch and self‑etch methacrylate‑based adhesives with and without use of a hydrophobic resin coating resulted in acceptable bond strengths.