EFFECTS OF DIFFERENT AIRBORNE PARTICLE ABRASION PROTOCOLS ON THE SURFACE ROUGHNESS AND SHEAR BONDING STRENGTH OF HIGH/ULTRA-TRANSLUCENT ZIRCONIA TO RESIN CEMENT

This study evaluated the surface roughness and shear bond strength (SBS) of highly/ultra-translucent monolithic zirconia ceramics subjected to different mechanical surface pre-treatments. A total of 225 square samples of three zirconia materials (KATANA Zirconia UTML (ML), DD Bio ZX2 (DB), and DD cube X2 (DC)) were used. The surface roughness and SBS values of the materials with respect to a resin cement (Panavia V5) were investigated after subjecting the samples to surface treatments using air abrasion particles of two types (aluminium oxide or glass microbeads) and sizes (50 or 110 m). The data were analysed using a two-way analysis of variance, followed by Tukey's post-hoc test for multiple comparisons. The highest mean surface roughness of the DC and ML ceramics were obtained after abrasion with the 110-m Al 2 O 3 particles (2.954 0.266 m and 2.850 0.296 m, respectively). The mean SBS values of the DB, DC, and ML ceramics could be arranged in the following order based on the treatments: 110-m Al 2 O 3 particles, 50-m Al 2 O 3 particles, 110-m glass microbeads, 50-m glass microbeads, and the control. The combination of air abrasion with the 50-m Al 2 O 3 particles and treatment with a 10-MDP primer resulted in the most durable bonding of the zirconia ceramics.