The bone height of the lower right 1st molar of a 24-year-old lady is sufficient (Fig.1).  The tooth has crown fracture after root canal therapy.  The lingual furca pocket is 6 mm with tenderness.  Osteotomy may be initiated slightly more buccally if the lingual plate is affected. 

Septum Placement

Xin Wei, DDS, PhD, MS 1st edition 04/15/2015, last revision 04/15/2015