Which of the following is dental formula of a 9 years old child_____________?
Correct answer: A. 6 EDC21/ 6EDC21
- A. 6 EDC21/ 6EDC21
- B. 6EDCBA/ 6EDC21
- C. EDC21/EDC21
- D. 76EDC21/ 7EDC21
Explanation
At about 9 years, the permanent first molars and incisors are present, while the primary canines and molars usually remain. Thus the mixed-dentition formula is represented by 6, 1, 2 with E, D and C in each quadrant, matching option a despite the compressed notation.
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