Question 260 (part 2) · LDEK · Cast partial dentures
Indicate true statement regarding the distal rigid rest of cast removable dentures:
1) the rest is located on second or subsequent tooth from the gap;
2) the rest is located on occlusal surface of the tooth in I area;
3) the rest is located on the tooth adjacent to the gap in II area;
4) it is designed in unbounded edentulous gaps;
5) it is designed in small interdental gaps;
6) in unbounded edentulous they act as indirect retainers;
7) they retain the denture in chosen direction of introductory path;
8) in some cases, they widen the retaining surface of the denture and allow for the course of clasp line in its area.
Correct answer is:
2) the rest is located on occlusal surface of the tooth in I area;
3) the rest is located on the tooth adjacent to the gap in II area;
4) it is designed in unbounded edentulous gaps;
5) it is designed in small interdental gaps;
6) in unbounded edentulous they act as indirect retainers;
7) they retain the denture in chosen direction of introductory path;
8) in some cases, they widen the retaining surface of the denture and allow for the course of clasp line in its area.
Correct answer is:
- A. 2,4,7,8.
- B. 3,5,7,8.
- C. 1,4,6,8.
- D. 1,5,6,7.
- E. 2,5,7,8.
Hint
A distant rest is placed away from the edentulous gap; consider when it acts against rotation of a free-end saddle.
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