Effect of adhesive systems on shear bond strength of metal brackets bonded to different ceramic surfaces

Abstract Objectives To evaluate the effect of adhesive systems on shear bond strength (SBS) of metal brackets bonded to different ceramic surfaces. Materials and methods This study was carried out on 120 ceramic blocks. Ceramic blocks were divided into two main groups (60 blocks of VITABLOCS Mark II in group I and 60 blocks of IPS emax CAD in group II). All ceramic blocks were embedded in acrylic blocks with their surfaces facing upward. All ceramic blocks were acid etched with 9.6% HFA followed by silane application. Each group was divided into three subgroups (20 blocks/each). Each subgroup was bonded with a different adhesive system. Subgroup I was Transbond XT, subgroup II was Blugloo, subgroup III was Assure Plus + GoTo adhesive. All ceramic blocks were light cured then stored for 24 h in distilled water before SBS test. Adhesive Remnant Index (ARI) was evaluated to determine the site of bond failure. Analysis of variance and standard Student’s t test were used to analyze the differences in SBS. The χ 2 test was used to evaluate differences in ARI scores among groups. Results Significant differences in SBS among groups were found ( P ≤ 0.05). In group I, Blugloo had the highest SBS 19.34 MPa, followed by Assure Plus 16.10 MPa while Transbond XT had the lowest SBS 12.30 MPa. In group II, Blugloo also had the highest SBS 16.83 MPa, while Transbond XT also had the lowest SBS 10.50 MPa. There were no statistically significant differences in ARI scores among the subgroups of groups I and II ( P > 0.05). Conclusions SBS of metal brackets bonded to VITABLOCS Mark II ceramics was higher than SBS of IPS emax CAD ceramics. SBS of Blugloo and Assure Plus for both VITABLOCS Mark II and for IPS emax CAD ceramics were higher than Transbond XT. SBS of metal brackets bonded to two different ceramic surfaces using three different adhesive systems were higher than the clinically accepted bond strength.