Osteotomy starts buccomesial to the middle of the septal slope (Fig.2 white circle).  As the osteotomy enlarges sequentially, it shifts more or less to the center of the socket (Fig.3 yellow circle).

Septal Slope of Upper 2nd Molar Last Next

Xin Wei, DDS, PhD, MS 1st edition 08/25/2015, last revision 10/19/2019