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The access hole is distal as related to distal end guide (in fact #31 was used as distal stop before extraction) and radiation interference from #29 crown (Fig.4), as compared to design. The uneven mesial and distal crest may be the main reason for the deviation.
Xin Wei, DDS, PhD, MS 1st edition 11/17/2020, last revision 11/17/2020