Question 98 (part 2) · LDEK · Cavity preparation
Choose correct statements regarding the resistance form of cavity shape:
1) the shape given to a prepared tooth to enable the restoration and remaining tooth structure to withstand masticatory stress;
2) it concerns the cavities restored with non-adhesive material (amalgam);
3) the shape given to a prepared tooth to enable the restoration to hold and withstand masticatory stress;
4) with regard to the restoration, relation of extent of the cavity to its depth should be directly proportional;
5) elimination of right and acute angle (rounding them) in the transition between walls;
6) floor of the cavity should be flat.
Correct answer is:
2) it concerns the cavities restored with non-adhesive material (amalgam);
3) the shape given to a prepared tooth to enable the restoration to hold and withstand masticatory stress;
4) with regard to the restoration, relation of extent of the cavity to its depth should be directly proportional;
5) elimination of right and acute angle (rounding them) in the transition between walls;
6) floor of the cavity should be flat.
Correct answer is:
- A. 1,2,6.
- B. 3,4,5.
- C. 1,2,5.
- D. 1,4,5.
- E. 3,5,6.
Hint
Separate resistance form (preventing fracture of tooth and filling) from retention form (preventing dislodgement of the filling).
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