Fig.1: There are two fused residual roots, buccal and palatal (each having 1 canal in the middle).  After extraction, the socket is oval.  Since the socket is palatal, osteotomy is established in the middle of the socket (buccopalatal).

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Xin Wei, DDS, PhD, MS 1st edition 09/27/2018, last revision 09/27/2018