Effect of Air Borne Particle Abrasion on the Bond Strength of Customized Zirconia Hybrid Implant Abutment to Zirconia Superstructure: In Vitro Study

Abstract

Purpose: The purpose of this study was to evaluate the effect of air abrasion with aluminum oxide particles (Al2 O3) on the bond strength between customized two-piece zirconia implant abutments and zirconia (CAD/CAM) monolithic milled crowns using self-adhesive resin cement with a (MDP) containing primer.Method: This study was carried out on 16 zirconia monolithic crowns. Hybrid zirconia abutments were fabricated using customized zirconia copings cemented on ready-made titanium bases. Monolithic zirconia crowns were fabricated then divided into two equal groups (n=8). The first group represented zirconia crowns without air abrasion and the second group represented zirconia crowns subjected to 50 µm Al2 O3 air abrasion. Zirconia crowns were then cemented to their corresponding abutments using resin cement and a MDP containing primer. A universal testing machine (Autograph AG-IS Series, Shimadzu Universal) was used to test the shear bond strength (SBS) of specimens in both groups. Results: The statistical analysis for comparison of shear bond strength between samples revealed significant statistical differences in their mean values, with a t-test value of 2.961 and a p-value of 0.010, indicating that surface treatment with alumina air abrasion significantly enhances shear bond strength.Conclusion: Surface treatment of zirconia crowns with air-borne particle abrasion can provide a strong bond to zirconia hybrid, implant abutments when using a self- adhesive resin cement and a MDP monomer containing primer.