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KMID : 1023420140140030405
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Journal of Dental Hygiene Science
2014 Volume.14 No. 3 p.405 ~ p.410
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Effect of Porcelain Firing Process on the Marginal and Internal Fit of Ni-Cr Alloy Metal-Ceramic Crown
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Kim Ki-Baek
Kim Seok-Hwan
Kim Jae-Hong
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Abstract
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The purpose of this study in vitro investigation was to compare the marginal and internal fit of Ni-Cr alloy metal ceramic crown before and after porcelain veneering. Furthermore, this study evaluated whether the influence of the porcelain firing on the precision of fit of dental prostheses. The maxillary right incisor was selected as an abutment for experiments. Ten working models were prepared. Ni-Cr alloy cores appropriate for each abutment were prepared by lost wax technique. The marginal area and four internal areas of the crowns were measured at two stages: before veneering process and after upper porcelain firing. Silicone replica techniques were used. The data were statistically analyzed with the paired t-test(α=0.05). Mean±SD marginal and internal gap were 67.1±23.3 μm for the nickle chrome alloy core group and 74.4±21.9 μm for the metalceramic crown group. There were statistically significant differences in all investigated areas (p＜0.05). Within the limitations of this study, none of the Ni-Cr alloy metal crown values measured after porcelain firing process exceeded 120 μm, which is the clinically acceptable threshold.
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KEYWORD
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Internal fit , Marginal fit , Ni-Cr alloy , Porcelain firing process
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