The Effect of Endodontic Provisional Materials on the Surface Conditioning of Zirconium Oxide (ZrO2 ) Ceramic - Abstract
Introduction: There are no published reports on how endodontic provisional materials may affect bonding resin to zirconium oxide ceramic (ZrO2). The goal of this 2-part study was to determine the effect of endodontic provisional materials on the surface conditioning of ZrO2 when bonding resin to the ceramic. Null hypothesis: exposing ZrO2 to CavitW or IRM would not affect the shear bond strength of resin bonded to the ceramic after conditioning with Interface/Surpass (part I), or with Z-Prime Plus (part II).
Methods: For each part of the study, sintered blocks of ZrO2ceramic were divided into 3 groups. The ceramic was covered with provisional material (Cavit W or IRM) or left uncovered (control group). After 7 days the material was removed, the ceramic was conditioned with either Interface/Surpass or Z-Prime Plus, and resin (Z100) was bonded to the ceramic. After 24 hours, a shear bond test was performed using an Instron universal testing system. The data was analyzed by the Kruskal-Wallis analysis of variance.
Results: Exposure of ZrO2 ceramic to Cavit W or IRM did not decrease the mean shear bond strength of the resin to the ceramic regardless of the ceramic primer used. In part II, the mean shear bond strength of the experimental groups was statistically significantly higher than the control group. There was not a significant difference in shear bond strength between the Cavit W and the IRM groups.
Conclusions: The exposure of ZrO2 ceramic to Cavit W or IRM does not decrease the early shear bond strength of resin to the ceramic when conditioning with Interface/Surpass or Z-Prime Plus. When Z Prime Plus was used to condition the ceramic, there was an increase in the mean
shear bond strength of the resin bonded to the ceramic.