Question 73 · LDEK · Partial dentures
Dental clasps are the simplest and the most commonly used elements for retaining partial dentures on natural dentition. Indicate the true statements concerning these retentive elements:
1) retentive action of the clasps makes use of friction force;
2) friction force occurs between the flexible clasp arm and the surface above the tooth height of contour during horizontal movements of the denture;
3) friction force occurs between the flexible clasp arm and the surface below the tooth height of contour during horizontal movements of the denture;
4) friction force occurs between the flexible clasp arm and the surface below the tooth height of contour during vertical movements of the denture;
5) clasps stabilize the denture, limiting its movements during mastication and grinding.
The correct answer is:
2) friction force occurs between the flexible clasp arm and the surface above the tooth height of contour during horizontal movements of the denture;
3) friction force occurs between the flexible clasp arm and the surface below the tooth height of contour during horizontal movements of the denture;
4) friction force occurs between the flexible clasp arm and the surface below the tooth height of contour during vertical movements of the denture;
5) clasps stabilize the denture, limiting its movements during mastication and grinding.
The correct answer is:
- A. 1,2,5.
- B. 1,3,5.
- C. 1,4,5.
- D. 1,4.
- E. only 5.
Hint
Retention resists dislodging forces; consider the direction of denture removal and where the flexible tip lies relative to the height of contour.
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