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KMID : 0362220110380030171
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Journal of The Korean Research Society for Dental Materials
2011 Volume.38 No. 3 p.171 ~ p.180
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Effect of Surface Treatment on the Bond Strength of Various Dental Base Metal-Ceramic Systems
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Hwang Seong-Sig
Lee Joong-Bae
Choi Ki-Yeol
Lee Hae-Hyoung
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Abstract
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The purpose of this study was to investigate the bond strength of Be-free Ni-Cr base metal alloys with dental porcelain in comparing with those of Be-containing base metal alloys. Alloys used in this study were as followings; for Be-containing alloy, Verabond (VB), Rexillium V (RV); for Be-free alloy, Verabond 2V (2V), Bellabond Plus (BP), Super 3 (S3), Tilite P (TP), Tilite S (TS). Before applying dental porcelain, alloy specimens subjected to two different surface treatments; sandblasting and degassing after sandblasting. Metal-ceramic bond strength was determined from ISO 9693 three-point bending test. Elastic modulus of metal substrate was determined from load-displacement curve obtained from subsequent loading after debonding test. Two-way ANOVA test was conducted to analyze the effect of metal alloy and surface treatment on the bond strength and their interaction. Then multiple comparison’s test between group under each surface treatment and t-test between surface treatments were conducted. The metal-ceramic bond strength was significantly affected by difference in alloy used and surface treatment, and the interaction of both variances was also significant (P<0.05). These results indicate that the effect of surface treatment on the metal-ceramic bond strength was differed with variance of metal alloy used. Degassing treatment of metal alloy increased the bond strength of group RV, S3 and TP, the others were statistically unchanged. However, the bond strength of group BP decreased significantly after degassing
treatment. Overall, there was no significant difference in the metal-ceramic bond strength between Be-free and Be-containing alloys and the mean bond strength values were recorded over the minimum requirement of ISO 9693 (25 MPa), In conclusion, to increase the metal-ceramic bond strength, method of surface treatment for Ni-Cr base metal alloy should be properly selected before layering of dental porcelain.
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KEYWORD
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Beryllium, Degassing, Metal-ceramic bond strength, Ni-Cr alloy, Surface oxide
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