Question 195 · LDEK · Acrylic partial dentures
When designing retention for partial dentures by means of clasps, the following rules should be observed:
1) abutment tooth should be covered with a prosthetic crown protecting it against destruction;
2) abutment tooth should have an adequate retentive plane;
3) support axis should coincide with the clasp axis;
4) axis joining the two abutment clasped teeth should divide the denture into two equal parts;
5) regardless of a type of the designed clasp, it needs to have a rigid support from the side opposite to the flexible arm;
6) wrought wire clasps should be fixed with wax to the working cast;
7) wrought wire clasps should be fixed on the wax trial denture.
The correct answer is:
2) abutment tooth should have an adequate retentive plane;
3) support axis should coincide with the clasp axis;
4) axis joining the two abutment clasped teeth should divide the denture into two equal parts;
5) regardless of a type of the designed clasp, it needs to have a rigid support from the side opposite to the flexible arm;
6) wrought wire clasps should be fixed with wax to the working cast;
7) wrought wire clasps should be fixed on the wax trial denture.
The correct answer is:
- A. 1,2,3,6.
- B. 2,4,5,6.
- C. 2,3,5,7.
- D. 1,2,4,7.
- E. 1,2,3,5,7.
Hint
Clasp retention needs an undercut, rigid reciprocation and a common support and clasp axis; think when wrought clasps are tried in the mouth.
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