Question 55 · LDEK · Partial dentures
Indicate the rules concerning the location of retainers in relation to the denture base:
1) position of the retainers in relation to the denture base does not depend on the topography of edentulous space and the number of remaining teeth;
2) straight line joining the two retainers should divide the denture base into two, possibly equal parts;
3) rule regarding the division of the denture base by the clasp axis into two possibly equal parts does not apply, when three teeth can be involved as retainers;
4) in the case of posterior small bounded edentulous spaces, it is favorable to place the retainers on the straight line that runs along the alveolar ridge.
The correct answer is:
2) straight line joining the two retainers should divide the denture base into two, possibly equal parts;
3) rule regarding the division of the denture base by the clasp axis into two possibly equal parts does not apply, when three teeth can be involved as retainers;
4) in the case of posterior small bounded edentulous spaces, it is favorable to place the retainers on the straight line that runs along the alveolar ridge.
The correct answer is:
- A. 1,2,3.
- B. 1,2,4.
- C. 2,3,4.
- D. 2,3.
- E. 3,4.
Hint
Think of the fulcrum (clasp) line between retainers and how rotation of the denture around it can be minimised.
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