J Korean Acad Prosthodont.  2006 Dec;44(6):677-682.

The comparison of initial retentive force in different double crown systems

• Kwon HB
• Roh YH
• Lee SH

Abstract

STATEMENT OF PROBLEM: Various double crown systems have been used with removable partial dentures in the clinical field. Although retentive force between inner and outer crown are affected by several factors, differences between the retentive forces of different double crown system types are expected. PURPOSE: The purpose of this study was to evaluate the initial retentive force of outer crowns fabricated by the conventional casting technique in conus and hybrid double crowns. MATERIAL AND METHODS: Ten double crowns were fabricated. The groups were as follows. Group 1, double crowns of hybrid inner and outer crowns using the conventional casting method; Group 2, double crowns of conus inner and outer crowns using the conventional casting method. Tensile strengths of double crowns when the inner and outer crowns were separated on a universal testing machine were measured. These values of retentive force were then statistically analyzed using the Kruskal-Wallis test.
RESULTS
Retentive force in group 2 was significantly higher than that in group 1 (p<.05).
CONCLUSION
The initial retentive forces of double crowns were affected by the types of the double crown system.

Keyword

Double crowns; Retentive force; Telescopic crowns

MeSH Terms

Conus Snail
Crowns*
Denture, Partial, Removable
Tensile Strength