It was reported by a dental laboratory that a variety of abutments that they used had unbonded.Additional information was received on (b)(6) 2016 by laboratory personnel.He reported that he was having issue with the titanium abutment bonding to zirconia milling crowns.Further described as" the cement to the t-base to zirconia would separate".He stated that this had occured in the lab setting a few times( not exactly sure how many) no contact with the patient.Laboratory requested information on type of cement to use.Additional information on (b)(6) 2016: laboratory was aware of an abutment that debonded in the mouth of a patient.It was in service for one year, when he was informed that it was loose and debonded in the patient's mouth.Laboratory personnel stated that the patient did not suffer any adverse event nor injury as far as he knew and remembered.He was unable to provide any additional information regarding the incident nor collection of the doctor that reported it.He stated that there was no issue with the abutments themselves, however; the issue was with them bonding to the cement ( ivoclar multi-link cement).Therefore, he sent the unused inventory back.Lab reported they purchased a different brand of cement also.
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