Although the buccal (Fig.1 (mesial view of the extracted tooth #15): B) root is larger than the palatal (P) one, the palatal socket is larger than the buccal one (Fig.2 white area) because of the bone loss of the former.  For better restoration, osteotomy (Fig.2 red line) is initiated in the buccal slope of the septum (S) so that the final osteotomy is in the middle of the whole socket (Fig.3 red box).

Middle of Socket Next Xin Wei, DDS, PhD, MS 1st edition 04/19/2018, last revision 09/07/2018