Influence of nano-structured alumina coating treatment on shear bond strength between zirconia ceramic and resin cement / 대한치과보철학회지

ABSTRACT

PURPOSE: The aim of this study was to investigate whether the application of nano-structured alumina coating to the surface of Y-TZP could enhance the bond strength with resin cement. MATERIALS AND METHODS: A total of 80 zirconia plates were prepared and divided into four groups. 1) airborne particle abrasion treatment (A) 2) Rocatec treatment after airborne particle abrasion (R) 3) nano-structured alumina coating treatment after polishing (PC) and 4) nano-structured alumina coating after airborne particle abrasion (AC). Alumina coating was formed by the hydrolysis of aluminium nitride (AlN) powder and heat treatment at 900℃. Coating patterns were observed with FE-SEM. Resin block was bonded to treated zirconia ceramics using resin cement. The shear bond strengths were measured before and after thermocycling. RESULTS: The FE-SEM images show a dense and uniform nano-structured alumina coating structure, which enhances shear bond strength by increasing micro mechanical interlocking to resin cement. PC and AC groups showed higher shear bond strengths than A and R groups before and after thermocycling. A and R groups displayed significant drops in shear bond strength after thermocycling. However, PC and AC groups did not show any meaningful decreases in shear bond strength after thermocycling. CONCLUSION: Treatment of Y-TZP ceramics with nano-structured alumina coating could significantly increase their shear bond strength.