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KMID : 0362420140520020090
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Journal of Korean Academy of Prosthodontics
2014 Volume.52 No. 2 p.90 ~ p.96
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The effect of heat and press-on-metal technique on marginal fit of metal-ceramic crown
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Kim Ji-Eun
Kim Se-Yeon
Lee Cheong-Hee
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Abstract
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PURPOSE. The purpose of this study is to see what impact the heat and press-on-metal technique has on the marginal fit of metal ceramic crown.
MATERIALS AND METHODS. > Prior to the experiment, 4 metal master models were prepared. Each model has margin of chamfer, margin of heavy chamfer, margin of shoulder with bevel and margin of shoulder (collarless). Additionally, 10 crowns were made for each margin, total of 40 crowns. Marginal discrepancy between the master model and crown was observed at ×100 microscopic magnification in two states; in coping state and upon completion of making metal ceramic crown. Data analysis was performed using paired t-test along with one-way ANOVA and Duncan multiple comparison test.
RESULTS. After analyzing mean and standard deviation of marginal discrepancy, it was confirmed that marginal discrepancies were within the clinical permitted range for all states; in coping state and upon completion of making metal ceramic crown. For the chamfer group, a significant increase in marginal discrepancy upon completion of making metal ceramic crown was observed compared to the heavy chamfer group. Also, a marginal discrepancy of porcelain margin in shoulder group was significantly less than the marginal discrepancy of metal margin in chamfer and shoulder group.
CONCLUSION. From the test result, one can conclude that marginal fit of metal ceramic crown built with heat and press-on-metal technique is not significantly different from marginal fit of metal ceramic crown built with traditional technique. And along with efficiency of this system, heat and press-on-metal technique is considered in clinic.
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KEYWORD
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Dental marginal adaptation, Dental porcelain
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