The extraction socket is oval in the opening (Fig.2) with the mesiodistal dimension (arrowheads) larger than the buccolingual one, whereas the typical lower premolar socket is wider buccolingually.  No matter what, the osteotomy is placed as lingual as possible to avoid the Mental Loop.

Soft Bone Last Next Xin Wei, DDS, PhD, MS 1st edition 04/30/2015, last revision 12/26/2018