The abutment is loose for the 3rd time 17 months post cementation.  When the crown/abutment is removed, the hex is worn.  After proximal reduction, the crown/abutment feels to be unable to be re-seated.  When the crown is sectioned, the abutment itself is incompletely seated (Fig.7,8).  The mesial crest appears to interfere with seating (Fig.8).  When the 5.2x3 mm dummy abutment is seated, the buccal margin is subgingival, while the palatal one supragingival, suggesting the buccally tilted implant (guided surgery essential).  A 4.5x4(4) mm pair abutment seems to be seated completely (Fig.9).

Thin Septum  Last  Next Xin Wei, DDS, PhD, MS 1st edition 12/18/2020 last revision 12/19/2020