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KMID : 1020220130130020361
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Journal of Korean Society of Dental Hygiene
2013 Volume.13 No. 2 p.361 ~ p.368
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Evaluation of fitness of metal-ceramic crown fabricated by cobalt-chrome alloy
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Kim Jae-Hong
Kim Won-Soo
Kim Ki-Baek
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Abstract
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Objectives: The purpose of this in vitro study was to evaluate the effect of firing cycles on the marginal and internal fit of metal ceramic crown.
Methods: Ten same cases of stone models (abutment teeth 11) were manufactured. Ten cobalt-chrome cores were made per each models and the marginal and internal fit was evaluated through a silicone replica technique. The marginal and internal fit of specimens was measured twice. The first measurement was done after manufacturing cobalt-chrome alloy core and the second measurement was done after porcelain firing. T-test of paired sample for statistical analysis was executed with SPSS 12.0K for Windows (α=0.05).
Results: Mean(SD) marginal and internal fit were 77.1(23.3) ㎛ for the cobalt-chrome alloy core group and 84.4(21.9) ㎛ for the metal-ceramic crown group. They were statistically significant differences between groups for marginal and internal fit (p<.05).
Conclusions: All metal ceramic crowns showed marginal and internal fit ranged within the current clinical recommendations.
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KEYWORD
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cobalt-chrome alloy, internal fit, marginal fit, metal-ceramic crown
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