A 2 mm drill is used to initiate osteotomy in the mesial socket, followed by inserting a parallel pin (Fig.3).  The latter is either incompletely inserted or displaced (from its osteotomy site, yellow dashed line) during X-ray taking because of 3 mm deep osteotomy.   After use of 4.8 mm Magic Drill, a 5 mm tap drill does not achieve stability, whereas a 5.5x9 mm dummy implant does (Fig.4).  Red dashed line: The Inferior Alveolar Canal.

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Xin Wei, DDS, PhD, MS 1st edition 07/25/2017, last revision 08/20/2019