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KMID : 0988420020140020159
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Journal of Dental Science (C.N.U.)
2002 Volume.14 No. 2 p.159 ~ p.167
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A Study of the Effect of Ultrasonic Vibration on Bond Strength of Cemented Crown according to Margin Types and Cements
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Abstract
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This study was aimed to evaluate the effects of ultrasonic vibration on margin types and cements by comparing bond strength of cemented crown.
In this study, margins of each metal die, which were chamfer, shoulder and shoulder with bevel, were prepared using cement. The specimens were divided by the finish line and cement used, ultrasonic vibration. I made total 84 specimens. All specimens were divided into two groups. One group was not vibrated, the other group was subjected to ultrasonic vibration for 12minutes. Tensile bond strength was measured using Universial testing machine. The changes of bond strength in groups were statistically analyzed by t-test or one-way ANOVA.
The results were as follows:
1. Ultrasonic instrumentation diminished the bond strength of crown cemented with zinc phosphate cement and resin cement after 12minutes application.
2. In case of zinc phosphate cement, the bond strength of vibrated group was showed significantly decreased(p<0.05). In vibrated groups with zinc phosphate cement, shoulder with bevel exhibit a significant difference to chamfer and shoulder(p<0.05)
3. Resin cement was more resistant to ultrasonic vibration than zinc phosphate cement and showed no significant differences according to ultrasonic vibration and margin type.
In conclusion, These results revealed that zinc phosphate cement was most affected and resin cement was the least affected by ultrasonic vibration. Especially shoulder with bevel design was most affected in zinc phosphate cement groups, we should consider these results and be taken in the application of ultrasonic vibration to any teeth restored with crowns.
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