That is the buccal portion of the ridge is not even (Fig.4 arrowheads).  During osteotomy, drills inadvertently deviates buccal (1400 units), resulting in buccal deviation of the implant (Fig.5 arrow). 

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Xin Wei, DDS, PhD, MS 1st edition 06/11/2020, last revision 06/11/2020