Which of the following is not a type of trait of the permanent maxillary second premolar?: (A) Buccal view: narrow shoulders (margins of crown; mesio- and disto-occlusal angles)., (B) Occlusal table outline: ovoid., (C) Mesiomarginal groove interrupts mesial marginal ridge., (D) Lingual view: buccal profile is not visible.
Answer is C. No, or almost never does the mesial marginal developmental groove cross the mesial marginal ridge.