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http://dx.doi.org/10.13065/jksdh.2013.13.2.361

Evaluation of fitness of metal-ceramic crown fabricated by cobalt-chrome alloy  

Kim, Jae-Hong (Department of health science specialized in Dental Lab. Science & Engineering, Graduate school, Korea University)
Kim, Won-Soo (Department of Dental Laboratory Technology, Daejeon Health College)
Kim, Ki-Baek (Department of health science specialized in Dental Lab. Science & Engineering, Graduate school, Korea University)
Publication Information
Journal of Korean society of Dental Hygiene / v.13, no.2, 2013 , pp. 361-368 More about this Journal
Abstract
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 (${\alpha}$=0.05). Results : Mean(SD) marginal and internal fit were 77.1(23.3) ${\mu}m$ for the cobalt-chrome alloy core group and 84.4(21.9) ${\mu}m$ 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.
Keywords
cobalt-chrome alloy; internal fit; marginal fit; metal-ceramic crown;
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