Question 125 (part 2) · LDEK · Bridges
In case of preparing the teeth for bridges based on zirconium dioxide ceramics coping, following guidelines should be implemented:
1) preparation should ensure appropriate space for the coping; minimum of 0,4 mm and veneering layer; from 1 mm at the crown margin up to 1.5 mm; 2 mm on occlusal surface or incisal edge;
2) preparation should ensure appropriate space for coping; maximum of 0,4mm and veneering layer; 1.5 mm at the crown margin, up to 2; 2.5 mm on occlusal surface or incisal edge;
3) the margin should be of shoulder or chamfer type;
4) the margin should be of rounded shoulder or heavy chamfer type;
5) sharp preparation margins and undercuts should be avoided;
6) the preparation should be sharply contoured;
7) bridge connectors of pontics to crowns must be of minimum size: from 9 mm in anterior section to 12 mm in lateral section;
8) bridge connectors of pontics to crowns must be of maximum size from 9 mm in anterior section to 12 mm in lateral section.
Correct answer is:
2) preparation should ensure appropriate space for coping; maximum of 0,4mm and veneering layer; 1.5 mm at the crown margin, up to 2; 2.5 mm on occlusal surface or incisal edge;
3) the margin should be of shoulder or chamfer type;
4) the margin should be of rounded shoulder or heavy chamfer type;
5) sharp preparation margins and undercuts should be avoided;
6) the preparation should be sharply contoured;
7) bridge connectors of pontics to crowns must be of minimum size: from 9 mm in anterior section to 12 mm in lateral section;
8) bridge connectors of pontics to crowns must be of maximum size from 9 mm in anterior section to 12 mm in lateral section.
Correct answer is:
- A. 1,3,5,6,7.
- B. 1,4,5,7.
- C. 1,4,6,7.
- D. 1,2,5,8.
- E. 3,5,6,8.
Hint
Zirconia needs a minimum framework thickness, rounded internal angles and generously sized connectors; check whether each value is a minimum or a maximum.
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