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In fact the root stump is flattened with diamond bur and 9 mm bone trimmer with guide before point drill. When the osteotomy finishes with 3.5x13 mm drill (under drilling with 10.5 mm offset), it has deviated buccal (Fig.2,3,4); the outline of the bone trimmer mark is labeled by arrowheads in Fig.2. It appears that the center of the bone trimmer is dictated by that of the post space, as compared to Fig.1 *).
Xin Wei, DDS, PhD, MS 1st edition 06/15/2020, last revision 06/15/2020