Question 211 (part 2) · LDEK · Crowns
Choose true statements regarding the preparation of teeth in anterior section for a crown veneered with ceramics:
1) remove even layer of around 1.0mm of tissue from each surface;
2) one-dimensionally 1.2-1.5mm from labial surface;
3) one-dimensionally 0.6-0.8mm from palatal surface;
4) two-dimensionally 1.2-1.5mm from labial surface;
5) two-dimensionally 0.6-0.8mm from palatal surface;
6) two-dimensionally from palatal surface, but the amount of removed tissue in each place depends on the range of veneering;
7) proximal surfaces are prepared in ½ labial part.
Correct answer is:
2) one-dimensionally 1.2-1.5mm from labial surface;
3) one-dimensionally 0.6-0.8mm from palatal surface;
4) two-dimensionally 1.2-1.5mm from labial surface;
5) two-dimensionally 0.6-0.8mm from palatal surface;
6) two-dimensionally from palatal surface, but the amount of removed tissue in each place depends on the range of veneering;
7) proximal surfaces are prepared in ½ labial part.
Correct answer is:
- A. 1,7.
- B. 2,3.
- C. 3,4.
- D. 4,5.
- E. 4,6.
Hint
The labial surface is convex and must host both metal and porcelain, while palatal reduction depends on what will cover that surface.
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