저온열화가 도재전장 지르코니아의 결합강도와 굴곡강도에 미치는 영향

the bond strength and flexural strength of ceramic veneered zirconia. Methods: 3Y-TZP specimens(KaVo Zr, 25㎜×3㎜×1㎜)were prepared by five pre-treatment methods and divided into seven groups including control two groups, subsequently the specimens veneered with the E-MAX ceram according to manufacturer’s information(total specimen thickness 1.5㎜). Two groups from ceramic-zirconia specimens(n=105, n=15 per group)were assigned into two experimental fatigue conditions, namely storage in an autoclave at 134℃ for 5h, thermo-cycling(3,000cycles, between 5 and 55℃, dwell time 45s, transfer time 2s). A flexural strength test was performed in a universal testing machine(crosshead speed: 0.5㎜/min). Data were statistically analyzed using one-way ANOVA and Tukey’s test(α=0.05). Results: The ceramic-zirconia bond strength value for liner application group(LLW, 27.3±3.8) were significantly lower than those of the pre-treatment groups(30.72±5.3). The ceramic-zirconia bond strength and zirconia flexural strength was not affected by thermo-cycling(p>0.05), whereas it was affected by storage in an autoclave at 134℃ for 5h(p<0.05). Conclusion: The results indicated that the ceramic-zirconia bond strength and zirconia flexural strength was affected by low temperature degradation.