Purpose: To evaluate the bond strength of recently developed feldspathic veneering ceramics to zirconiumoxide ceramic core material (Y-TZP). In addition, the effect of thermocycling on the bond strength was investigated. Methods: 90 square Lava framework Y-TZP specimens were randomly assigned to three groups (n=30) and veneered with one of the three zirconia veneering ceramics Cerabien ZR (CZR), GC Initial (GCI), or Lava Ceram (LC). 30 additional metal-ceramic specimens served as the control (VO). 15 specimens per group were stored in a saline solution for 3 days. To test the durability of the bond, 15 specimens per group were thermocycled for 10,000 cycles between 5° to 60° C with a 15second dwell time. Shear strength was tested with an Instron universal testing system. A two-way ANOVA model and Tukey's HSD were applied for statistical analyses (α= 0.05). Results: The different material combinations revealed significantly different shear bond strength values (CZR>GCI>LC>VO). All veneering ceramic/zirconia combinations showed significantly higher bond strength than the metal-ceramic control VO. Bond strength values were not affected by thermocycling, except for CZR, which had significantly higher bond strength after thermocycling. Microscopic evaluation of failure modes revealed 100% cohesive failures in the veneering ceramic for all specimens.
|Original language||English (US)|
|Number of pages||4|
|Journal||American journal of dentistry|
|State||Published - Aug 2010|
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