Question 202 (part 2) · LDEK · Post and core restorations
Ideal length of post and core in coronal part is a topic of many publications and discussions. At present, it is accepted that it should be:
1) 2/3 of the length of remaining root;
2) ½ of the length of remaining root (in case of teeth with tooth resorption);
3) it should not affect the 4mm of gutta-percha apically;
4) it concerns only straight course of the root;
5) at minimum – of the height of future crown.
Correct answer is:
2) ½ of the length of remaining root (in case of teeth with tooth resorption);
3) it should not affect the 4mm of gutta-percha apically;
4) it concerns only straight course of the root;
5) at minimum – of the height of future crown.
Correct answer is:
- A. 2,3,4,5.
- B. 1,3.
- C. 1,2,3,4.
- D. 1,2,3,5.
- E. 1,2,5.
Hint
Recall the classic two-thirds rule, the adjustment for bone loss, the apical seal to preserve and the minimum length relative to the crown.
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