The key to occlusion is_______________?
Correct answer: A. Maxillary permanent first molar
- A. Maxillary permanent first molar
- B. Maxillary permanent second molar
- C. Maxillary primary first molar
- D. Maxillary primary second molar
Explanation
The permanent maxillary first molar is the key to normal occlusion because its mesiobuccal cusp fits into the buccal groove of the mandibular first molar. Its stable eruption and position establish the posterior molar relationship.
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