Internal thread stripping
Pt is a male in his fifties. Pt is a clencher. Fixtures were placed back in 2012 along 30 and 31 areas. Pt recently came to me with cc of loose crown. I examined the pt and removed the abutment and crown placed an encode abutment and noticed that the abutment was loose and pt was cringing as I noticed movement from the abutment. I referred pt back to the specialist that placed the fixtures, thinking it is an implant failure due to the mesial cantilever and the clenching forces. The specialist said that the implant is fully integrated but the internal thread on #30 might be worn.
My plan is to restore # 29 with over contoured crown and have the specialist or myself remove #30 fixture and replace it with a new one and splint 30 and 31 as a single unit. One of my colleagues mentioned that I do everything else but to cement a new abutment on #30 and deliver a splinted 30 and 31 2 unit bridge. This will save the pt from going through surgery. My question is should I place a new fixture or cement a new abutment . Please kindly share your knowledge with me.