In fact the guide was doubly checked for fitness prior to osteotomy, but grossly it seemed to be seated properly. The suspicion is related to the trimming at the site of #27 (Fig.2,3 (*), as compared to a mounted model in Fig.4,5 (arrowhead) and the model sent to lab for guide fabrication).
Xin Wei, DDS, PhD, MS 1st edition 04/18/2019, last revision 04/18/2019