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Abstract
Purpose
The aim of this research was to establish the effect and variation in differing convergence angle and length of abutment on the retention of full veneer casted gold crown.
Materials and methods
Two different length,5 mm and 10 mm in height with convergence angles of 5, 10, 15 and 25 degrees crowns were fabricated. Cementation was done using cements; zinc phosphate cement (Fleck's zinc phosphate cement), resin-modified glass ionomer cement (Vitremer) and resin cement (Panavia 21). These were tested for tensile force at the point of separation by using Instron Universal Testing Machine. Statistical analysis was done by SAS 6.04 package.
Results
In all cements the mean retention decreased with significant difference on increase of convergence angle (P<.05). Increase in every 5 degree-convergence angel the retention rate decreased with resin-modified glass ionomer cement of 15.9% and resin cement of 14.8%. With zinc phosphate cement, there was largest decreasing rate of mean retention of 25.5% between convergence angles from 5 degree to 10 degree. When the crown length increased from 5 mm to 10 mm, the retention increased with the significant difference in the same convergence angle and in all types of cement used (P<.05).
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Fig. 3.
Regression analysis model of cement groups. (Length 5 mm) Equation - Fleck's ZPC: y = 861.1 - 45.24x + 0.7922x2 - Vitremer: y = 486.796 - 13.2328x - Panavia 21: y = 803.565 - 20.7705x
Table 1.
Dental cements used in this study
Table 2.
Mean values and standard deviations of separation forces (N) of length 5 mm
Table 3.
Turkey's HSD test for variable: separation force (N)
| Cement | Angle's section | 5° -10° | 10° -15° | 15° -25° |
|---|---|---|---|---|
| Fleck's ZPC | ∗∗∗ | ∗∗∗ | ∗∗∗ | |
| Vitremer | ∗∗∗ | ∗∗∗ | ∗∗∗ | |
| Panavia 21 | ∗∗∗ | ∗∗∗ |
Table 4.
Mean value and standard deviations of separation force (N) of length 10 mm
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