Violation
Which of the following root surfaces are most likely to have concavities that will make root planing difficult? 1. Mesial surfaces of maxillary first premolars. 2. Mesial surfaces of mandibular incisors. 3. Mesial surfaces of maxillary incisors. 4. Distal surfaces of mandibular second premolars
(1) and (2)
(1) and (3)
(1) and (4)
(2) and (4)
(3) and (4)