On the occlusal surface of a U type mandibular second premolar, the "U" pattern is due to the form of the:
(1) central groove and lingual groove.
(2) buccal ridge.
(3) ML and DL cusps.
(4) central groove and buccal triangular grooves.
(5) transverse ridge.
Answer: central groove and buccal triangular grooves
Explanation:
On the occlusal surface of a U type mandibular second premolar, the "U" pattern is due to the form of the central groove and buccal triangular grooves.
