In fact there is subgingival caries (Fig.2 *). The accessory incision is made mesiobuccal of #31 due to horizontal impaction. In fact the tooth is buccal and slightly mesial to #31. The impacted tooth requires several sections to be removed.
Xin Wei, DDS, PhD, MS 1st edition 01/16/2020, last revision 01/16/2020