Question 219 · LDEK · Acrylic partial dentures
What are the features of the clasp of mucosa-supported removable partial denture?
1) is designed as in the cast clasp-retained removable partial dentures and is cast from medium-fusing alloys;
2) is usually a wrought-steel clasp;
3) composes of two parts - a circumferential arm and a tail;
4) composes of three parts - a retentive arm, intermediate arm and a tail;
5) retentive arm should be located close to the occlusal surface;
6) retentive arm is flanged on the retentive surface, not too close to the gingiva, and its terminus is directed to the incisal edge or the occlusal surface;
7) intermediate arm - more or less active, should have a bent shape and should not be located in acrylic resin;
8) intermediate arm runs above the height of contour and embeds into the denture base;
9) tail of the clasp should have a shape that enables its anchoring in acrylic resin e.g. loop-like shape; 10) in mucosa-supported dentures supragingival clasps can be used; 11) in mucosa-supported dentures supragingival clasps should not be used.
The correct answer is:
2) is usually a wrought-steel clasp;
3) composes of two parts - a circumferential arm and a tail;
4) composes of three parts - a retentive arm, intermediate arm and a tail;
5) retentive arm should be located close to the occlusal surface;
6) retentive arm is flanged on the retentive surface, not too close to the gingiva, and its terminus is directed to the incisal edge or the occlusal surface;
7) intermediate arm - more or less active, should have a bent shape and should not be located in acrylic resin;
8) intermediate arm runs above the height of contour and embeds into the denture base;
9) tail of the clasp should have a shape that enables its anchoring in acrylic resin e.g. loop-like shape; 10) in mucosa-supported dentures supragingival clasps can be used; 11) in mucosa-supported dentures supragingival clasps should not be used.
The correct answer is:
- A. 2,4,6,7,9,10.
- B. 1,4,5,7,8,10.
- C. 1,3,5,8,9,11.
- D. 2,3,5,7,9,10.
- E. 1,3,6,8,9,11.
Hint
Think of a clasp bent from wire in the laboratory and embedded in an acrylic base: what parts does it have and where does each run?
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