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According to Schour & Massler the crown completion of both permanent maxillary and mandibular first molars is________________?

According to Schour & Massler the crown completion of both permanent maxillary and mandibular first molars is________________?

A. 1½ 2 years
B. 2½ – 3 years
C. 3-4 years
D. 3-5 years