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. 

Subgingival Caries  Last  Next

Xin Wei, DDS, PhD, MS 1st edition 01/16/2020, last revision 01/16/2020