Bond strength of different veneering ceramics to zirconia and their susceptibility to thermocycling

作者：Blatz Markus B^*; Bergler Michael; Ozer Fusun; Holst Stefan; Phark Jin Ho; Chiche Gerard J

来源：American Journal of Dentistry, 2010, 23(4): 213-216.

Purpose To evaluate the bond strength of recently developed feldspathic veneering ceramics to zirconium-oxide 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 (GO), 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 degrees to 60 degrees C with a 15-second 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 (alpha= 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 m the veneering ceramic for all specimens (Am J Dent 2010,23 213-216)

• 出版日期2010-8