Question 26 (part 2) · LDEK · Post and core restorations
Indicate true statements regarding preparation of tooth for individual post and cores:
1) length of future core should be around 3/4 of root length;
2) length of the core should be at least of the length future crown;
3) width of canal prepared for core should be at maximum of ½ root width;
4) it is essential to leave at least 2mm dentin around the core;
5) canal should be cone shaped with degree of convergence not higher than 3 degrees.
Correct answer is:
2) length of the core should be at least of the length future crown;
3) width of canal prepared for core should be at maximum of ½ root width;
4) it is essential to leave at least 2mm dentin around the core;
5) canal should be cone shaped with degree of convergence not higher than 3 degrees.
Correct answer is:
- A. 1,2.
- B. 2,3.
- C. only 2.
- D. 2,5.
- E. all of the above-mentioned.
Hint
Recall the classic proportions: post length relative to crown and root, post width relative to root, and the dentine wall left around it.
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