On average, approximately what is the dimension of the permanent maxillary canine at the widest mesiodistal diameter of the crown?: (A) 5.5 mm., (B) 6.5 mm., (C) 7.5 mm., (D) 8.5 mm.
Answer is C. The dimension of the permanent maxillary canine at the widest MD diameter is 7.5 mm (7.5 mm (Ash and Nelson, 2003); 7.6 mm ).