Question 181 (part 2) · LDEK · Cast partial dentures
Indicate false statements regarding the preparation of the model during laboratory fabrication of cast removable denture:
- A. all undercuts or their parts, which surfaces are not used for retentive arms placement, are blocked with wax.
- B. surface of wax on surfaces which are not used for retentive arms placement should be parallel to the introductory path.
- C. area of retentive arm design, part of undercut is filled with wax to the level of upper margin of retentive margin and forms a margin.
- D. margin formed by wax at the supragingival arms must be close to the border of undercut space.
- E. margin formed by wax at the straight, recurrent and ring arms may be of any width.
Hint
Consider where the wax ledge must sit relative to the planned retentive arm so that the arm still rests on the tooth.
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