Intraop positional PA (Fig.1) shows that it is predictably safe to place 6.3x8 mm implant with the apical diameter (4.3 mm < 2.46 mmx2).  Red dashed line indicates the abnormal segment of the IAN (pink line: normal segment).

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Xin Wei, DDS, PhD, MS 1st edition 02/01/2013, last revision 01/19/2018