Question 348 · LDEK · Tooth development and mineralization
Select the correct development chronology of permanent maxillary central incisors:
1) calcification begins at 10-12 months;
2) calcification begins at 3-4 months;
3) crown formation completes at 4-5 years;
4) crown formation completes at 5-6 years;
5) root formation completes at 10-11 years;
6) root formation completes at 9-10 years.
The correct answer is:
2) calcification begins at 3-4 months;
3) crown formation completes at 4-5 years;
4) crown formation completes at 5-6 years;
5) root formation completes at 10-11 years;
6) root formation completes at 9-10 years.
The correct answer is:
- A. 1,3,5.
- B. 1,4,6.
- C. 2,3,5.
- D. 2,3,6.
- E. 1,3,6.
Hint
Recall when the maxillary central incisor begins to calcify, when its crown is finished, and that the root closes about 2-3 years after eruption.
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