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KMID : 0362120110330030193
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Journal of Technologic Dentistry
2011 Volume.33 No. 3 p.193 ~ p.202
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Influence of low temperature degradation on the bond strength and flexural Strength of veneered Zirconia(3Y-TZP)
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Lee Jung-Hwan
Ahn Jae-Seok
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Abstract
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Purpose: The aim of this study was to evaluate the effect of pre-treatment of core and hydrothermal treatment on the bond strength and flexural strength of ceramic veneered zirconia.
Methods: 3Y-TZP specimens(KaVo Zr, )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 1.5mm). 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 for 5h, thermo-cycling(3,000cycles, between 5 and , dwell time 45s, transfer time 2s). A flexural strength test was performed in a universal testing machine(crosshead speed: 0.5mm/min). Data were statistically analyzed using one-way ANOVA and Tukey’s test(=0.05).
Results: The ceramic-zirconia bond strength value for liner application group(LLW, ) were significantly lower than those of the pre-treatment groups(). 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 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.
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KEYWORD
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Bond strength, Ceramic veneered zirconia, Flexural strength, Hydrothermal treatment, Low temperature degration, Y-TZP
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