The objective of this study was to compare the bonding properties of new dental adhesive systems to the surface of titanium for the express purpose of evaluating these systems for composite veneering of titanium restorations.
Method:
Fifty-four titanium specimens (10 × 10 mm, 2 mm in thickness) were randomly divided into six groups accourding to the surface conditioning method to be applied. One of the groups served as control and no surface treatment was applied (Group 1). Experimental groups: air abrasion with 250 µm aluminum oxide (Al2O3) particles (Group 2); application of a light-cured dental adhesive and (Group 3); application of a thin layer of a metal primer. (Group 4); air abrasion with 250 µm Al2O3 particles and application of light-cured dental adhesive (Group 5); air abrasion with 250 µm Al2O3particles and application of metal primer (Group 6). A teflon mold with a circular hole in the center (2 mm thick×3 mm in diameter) was positioned on the center of the specimens’ surfaces. After applying opaque paste the composite resin build-up was polymerized in the light-polymerizing unit for 3 minutes. The specimens were stored for 24 h in distilled water at 37 °C. Shear bond strength was then determined using a universal test machine.
Result:
Surface treatments increased the shear bond strength of indirect composite resin to titanium alloy surface (P<0.05). The results of one-way ANOVA revealed a significant difference among the groups (P<.001). The highest shear bond strength values were obtained with application of air abrasion with 250 µm Al2O3 particles and application of light-cured dental adhesive (26.84±2.25) and significant differences were found between other groups (P<.05).
Conclusion:
The current study revealed that airborne-particle abrasion followed by applying dental adhesive with specific functional monomers improves the bond strength of indirect composite to titanium.