The abutment at #4 is loose >1 year post cementation.  The abutment remains incompletely seated (gap and longer apical space (double arrows) when the abutment/crown complex rotates lingual mesiobuccal post proximal reduction (Fig.14 curved arrow).  Further proximal reduction and lingual rotation distobuccal leads to complete seating (Fig.15 curved arrow).   BW image is better than PA.

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Xin Wei, DDS, PhD, MS 1st edition 03/12/2021, last revision 03/14/2021