Correcting the fit of implant-retained restorations by electric discharge machining.

Discrepancies in the passive fit of an implant-retained restoration to its supporting abutments are occasionally encountered during the clinical try-in and evaluation appointment. Frequently, the framework must then be sectioned and meticulously soldered to achieve accurate seating of the prosthesis. Furthermore, it may be necessary to remove the restoration's existing esthetic porcelain or resin veneer to improve access for soldering. These traditional corrective procedures are likely to require another patient appointment and significant laboratory time. This article describes the alternative use of electric discharge machining to correct the fit of implant-retained restorations that display incomplete seating during the clinical try-in appointment.