The Importance of MDP Priming, Silica Blasting or Glazing on the Retention Force of Y-TZP Copings to Varying Geometry Tooth Abutments

To evaluate the influence of convergence angle tooth preparations and abutments height several surface treatments for zirconia copings through tensile retention test. 120 crown were made in Nema G10 with maxillary first molar anatomy. In total, 60 5 mm divided into two groups 6° 20° angles preparations, a 12° 4 6 heights. Three used MDP-primer (10-Methacryloyloxydecyl dihydrogen phosphate), glazing or silica blasting. The scanned to make (3Y-TZP–Yttria-Stabilized Tetragonal Zirconia Polycrystals, Vita In-Ceram YZ). After cementation, mechanical cycling (2 × 106 cycles, 3 Hz, 100 N) was performed aging. cycling, tested (1 kN load cell; 0.5 mm/s speed). Both support base embedded acrylic resin aid device that maintained long axis perpendicular horizontal plane. Data analyzed two-way ANOVA Tukey test (95%). revealed influenced (p = 0.0232), but showed no statistically significant difference 0.086). blasting higher forces specimens variations. For bonded crowns, force provided by high preparation is critical cannot be improved treatments. short MDP-based Primers Silica are advisable restoration longevity.