Question 124 · LDEK · Partial dentures
Indicate the true statements concerning the retentive action of dental clasps:
1) when the denture rests on the basal seat inactively, the retentive element of the clasp, that is its flexible arm, generates no force on the tooth;
2) when the denture is dislocated from the basal seat, between the retentive arm and the tooth the friction force occurs, that decreases as it is getting closer to the height of contour;
3) when the denture is dislocated from the basal seat, between the retentive arm and the tooth the friction force occurs, that increases as it is getting closer to the height of contour;
4) strained clasp generates vertical and horizontal stress on the tooth;
5) the horizontal pressure strength is the greater, the lower the degree of elasticity of the retentive arm, the more convex the tooth and the sharper the degree of the retentive undercut.
The correct answer is:
2) when the denture is dislocated from the basal seat, between the retentive arm and the tooth the friction force occurs, that decreases as it is getting closer to the height of contour;
3) when the denture is dislocated from the basal seat, between the retentive arm and the tooth the friction force occurs, that increases as it is getting closer to the height of contour;
4) strained clasp generates vertical and horizontal stress on the tooth;
5) the horizontal pressure strength is the greater, the lower the degree of elasticity of the retentive arm, the more convex the tooth and the sharper the degree of the retentive undercut.
The correct answer is:
- A. 1,2,4.
- B. 1,2,4,5.
- C. 1,3,4,5.
- D. 2,4,5.
- E. 3,4,5.
Hint
Follow the clasp tip as the denture is pulled away: does the arm flex more or less as it rides up towards the survey line?
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