Removing a cement-retained abutment-supported crown?

Last Updated October 16, 2013

I have a patient with an implant in #9 site [maxillary left central incisor;21] with a cement retained metal ceramic crown. Some of the procelain has fractured off the crown. The implant and metal substructure were intact and surrounding periodontium was healthy. How do you remove the crown from the abutment without damaging the abutment or the implant? I tried vibrating the crown with an ultrasonic tip but that did not work. Could you just remove the porcelain and prep the metal substructure for a metal ceramic crown, make a conventional impression and cement a new crown on the metal substructure of the old crown?

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