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The crown/abutment at #18 is loose 3 years 2 months post cementation; when the crown/abutment is retightened, the abutment remains incompletely seated (Fig.4 <) in spite of reduction of the proximal contact (arrow). It may be due to the block of the distal crest (*).
Xin Wei, DDS, PhD, MS 1st edition 09/17/2020, last revision 09/17/2020