By mistake, the implant at #18 is placed a little deeper than necessary, since the buccal bone is inferior to the lingual one (Fig.4; 5.3x12 mm vs. 5.0x12 mm at #19). No paresthesia of the lower lip occurs postop.
It appears that the abutment margin is supragingival (white dashed line: gingival margin) and should be trimmed prior to impression. Or change the abutments to ones with shorter cuff. It may be so for those at #18 and 19 (Fig.9: 4 months postop).
Sufficient Interocclusal Space
Xin Wei, DDS, PhD, MS 1st edition 04/03/2016, last revision 01/19/2018