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Effect of friction coefficient on Akers clasp retention
1Department of Removable Prosthodontics, Hiroshima University School of Dentistry, Japan.
The Journal of Prosthetic Dentistry
|July 1, 1997
Summary
The retentive force of removable partial denture clasps increases linearly with the friction coefficient between the clasp and abutment materials. Clasp design should be adapted based on the specific abutment material used for optimal denture function.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Effective retentive force control is crucial for removable partial denture success.
- The relationship between friction coefficients of various abutment and clasp materials and their impact on clasp retention remains largely unexplored.
Purpose of the Study:
- To determine the friction coefficients between different restored abutment and clasp materials.
- To theoretically assess how these friction coefficients influence clasp retention.
Main Methods:
- Evaluated static friction coefficients between three clasp alloys (gold, high Pd, Co-Cr) with two surface treatments (polished, sandblasted) and four abutment materials (enamel, porcelain, gold, high Pd alloys).
- Tested friction under dry, water-lubricated, and saliva-lubricated conditions.
- Theoretically estimated the effect of friction coefficients on clasp retention.
Main Results:
- Friction coefficients varied significantly, ranging from 0.08 to 0.37.
- A linear correlation was observed between the friction coefficient and the retentive force of the clasp.
Conclusions:
- A novel formula demonstrates that retentive force increases linearly with the friction coefficient.
- Tailoring clasp designs to specific abutment materials is recommended for improved denture retention.