Restorative & Materials · single question
You have a working length of 16 mm. How much space do you have for post placement?
Show answer and explanation
Correct answer: D. 11 mm
- A. 5 mm is the minimum amount of gutta-percha that must remain apically — not the available post space.
- B. Incorrect arithmetic for this working length.
- C. Incorrect arithmetic for this working length.
- D. Correct. At least 5 mm of apical gutta-percha seal must remain: 16 mm - 5 mm = 11 mm of canal space available for post preparation.
Note: Rule: at least 5 mm of gutta-percha must remain apically.
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