J Korean Acad Prosthodont.  2013 Apr;51(2):99-106. 10.4047/jkap.2013.51.2.99.

Comparison of the retention of the full veneer casted gold crowns with varying convergence angle, crown length and dental cements

• Yun JH
• Cho JH
• Kim JH
• Lee KW

• KMID: 2045112
• DOI: http://doi.org/10.4047/jkap.2013.51.2.99

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).
CONCLUSION
The retention was strongly dependent on geometric factors of abutment. Much care is required in choosing cements for an optimal retention in abutments with different convergence angles and crown lengths.

Keyword

Convergence angle; Crown length; Full veneer casted gold crown; Dental cement; Retention; Tensile force

MeSH Terms

Acrylic Resins
Cementation
Collodion
Crowns
Dental Cements
Glass Ionomer Cements
Phenothiazines
Phosphates
Resin Cements
Retention (Psychology)
Silicon Dioxide
Zinc
Zinc Compounds
Zinc Phosphate Cement
Acrylic Resins
Collodion
Dental Cements
Glass Ionomer Cements
Phenothiazines
Phosphates
Resin Cements
Silicon Dioxide
Zinc
Zinc Compounds
Zinc Phosphate Cement

Figure

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  Fig. 1. Schematic diagram of die (Θ: convergence angle, h: crown length).

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  Fig. 2. Means and standard deviations for retention forces (N) of length 5 mm (Note: n=5).

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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

• 

  Fig. 4. Means and standard deviations for retention forces (N) of length 10 mm (note: n=5).

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