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KMID : 0362220100370020151
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Journal of The Korean Research Society for Dental Materials
2010 Volume.37 No. 2 p.151 ~ p.158
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Study on Shear Bond Strength of Ceramics Fused to Ni-Cr Alloys by Heat Treatment
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Lee Jung-Hwan
Ko Eun-Kyoung
Joo Kyu-Ji
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Abstract
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The purpose of this study was to evaluate fine structure of ceramics fused by heat treatment to metallic oxide surfaces Verabond V (beryllium-infused Ni-Cr alloy) and Verabond 2V (niobium-infused Ni-Cr alloy), and to observe the change between metallic oxide with opaque layer, and to measure the shear bond strength between the ceramic and metallic oxide, and to compare and analyze the results. Within the limits of this study, the following conclusions were drawn: 1. The observation of surface morphology of the oxide films of the specimens by SEM showed that Verabond V alloy observed a needle like structure and Verabond 2V observed a coarsening with an increasing degassing hold time. 2. Verabond V alloy showed gradually decreasing Ni and Cr ratios from metal surface between metallic oxide and opaque layer, whilst Verabond 2V alloy showed a gradually decreasing Ni ratio from the metal surface, but the Cr ratio increased remarkably from oxide layer. 3. Verabond V group, containing Be, showed a higher bond strength than the Verabond 2V group which contained Nb. 4. The shear bond strength measured highest to V5, 2V5 groups with 10 minutes hold time under air, and measured lowest from V1, 2V1 groups which were not treated with heat, and there was a significant difference (p<0.05).
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KEYWORD
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Ni-Cr Alloy, Shear Bond Strength, Metal-ceramic Bonding
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