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KMID : 0354619960080010087
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Journal Dankook Dental Research Institute
1996 Volume.8 No. 1 p.87 ~ p.102
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A Study of the Tensile Load Several Clasps According to Various Undercut Area
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Abstract
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Poor marginal fidelity resulting in a large marginal gap increases plaque accumulation, gingival inflammation and dental caries.
The purpose of this study was to evaluate the marginal fit of three different cervical finishing methods of prepared teeth.
A steromicroscope was used to measured the space between the margin of restoration and the finishing line of prepared tooth.
The results were statistically analyzed using the ANOVA and Multiple Range Test(Tukey's HSD).
@ES The results were as follows :
@EN 1. There were no significant differences concerning the types of tooth and position (P > 0.05), whereas the differences were statistically significant in case of cervical finishing methods (P < 0.05).
2. There were statistically significant differences between before and after cementation (P < 0.05).
3. In comparison according to variable margins after cementation, the gap discrepancies were increased in 130° shoulder margin, chamfer margin and 90° shoulder margin in ascending order, and there were significant differences between 90°
shoulder
margin and chamfer, 130° shoulder margin.
4. In comparison according to variable margins, the gap discrepancies were increased in chamfer margin, 130° shoulder margin and 90° shoulder margin in ascending order, and there were significant differences between 90° shoulder margin and
chamfer,
130° shoulder margin.
5. This study demonstrated a better marginal fit with all-ceramic crowns fabricated on chamfer and 130° shoulder margin compared with 90° shoulder margin.
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