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KMID : 0362419910290030181
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Journal of Korean Academy of Prosthodontics
1991 Volume.29 No. 3 p.181 ~ p.196
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An experimental study on the fitness of the cervical margin in the ceramo-metal crown accordingto the alloy types and the curvature of labio-cervlcal margin
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Jeon Young-Chan
Kim Jung-Hwa
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Abstract
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The purpose of this study was to evaluate the marginal fit of ceramo-metal crown according o the different ceramo-metal alloy types and the curvature of labio-cervical margin. Degudenta as procious and Verabonda as non-precious ceramo-metal alloy were used. The abutment was preparaed with two different curvature types : a normal curvature type and a pronounced curvature type. 20 crowns were farbricated using four different combinations and their marginal fits were measured at 3 consecutive stages (before degassing, after degassing, after glazing) using microscope under 200 magnification.
The results were as follows :
1. Marginal fitness before degassing
The groups of precious ceramo-metal exhibite better marginal fit than the groups of non-precious ceramo-metal with significant difference(P<0.05). In the same ceramo-metal groups, the normal curvature group exhibited better marginal fit than the pronounced curvature group but without significant difference(P>0.05).
2. Marginal fitness after degassing
By degassing, the group of pronounced curvature and non-precious ceramo-metal was deformed the most, and the degree of margin fitness of each group was the same as before degassing.
3. Marginal fitness after glazing
The group of normal curvature and precious ceramo-metal exhibited better marginal fit than the group of pronounced curvature and non-precious ceramo-metal with significant difference(P<0.05), and the degree of margin fitness of each group was the same as before degassing.
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