Objectives: The aim was to evaluate the effect of thermal cycling on the metal–ceramic bond strength. Methods: Four different noblemetal alloys were used. Specimens for the crack initiation test according to ISO 9693 were prepared to assess metal–ceramic bond strength (n = 10). The metal substrates were either air-borne particle abraded or polished prior to veneering. Bond strength was measured after veneering or after 6000 thermal cycles. With one alloy in addition long-term thermal cycling with 15,000 and 50,000 cycles was carried out. Statistical

analysis was performed with one-way ANOVA followed by a post hoc Bonferroni test. Results: Polished metal substrates showed a significantly lower bond strength compared to the air-borne particle abraded substrates. Treatment with 6000 thermal cycles did not significantly reduce the bond strength. Long-term thermal cycling resulted in an exponential decrease of bond strength for both polished and air-borne particle abraded specimens. Conclusions: Air-borne particle abrasion significantly increases metal–ceramic bond strength. Thermal cycling of metal–ceramic composites results in an exponential decrease of bond strength. The crack initiation test is a sensitive method for assessing the metal–ceramic bond strength.

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  • ?
    Lv 4
    1 decade ago
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    目标是:这样做的目的是评价热循环对金属陶瓷粘结强度。方法:四种不同noblemetal合金使用。标本的裂纹萌生测试按照ISO 9693准备评估金属陶瓷粘结强度( 10例) 。金属基板被空气传播颗粒磨损或抛光之前饰面。粘结强度测定饰面或之后在6000热循环。一合金除长期热循环与15,000和50,000周期进行。统计


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