After flattening the root stump with surgical burs and bone trimmer at #4 (Fig.1), it is difficult to use point drill and 2.2x7.3 mm drill because of incomplete engagement of drill cylinder with guide sleeve (Fig.2).  The initial osteotomy seems to be buccal. 

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Xin Wei, DDS, PhD, MS 1st edition 06/16/2020, last revision 06/16/2020