Fit Analysis of Different Framework Fabrication Techniques for Implant-Supported Partial Prostheses

I mplant-supported partial prostheses have high success rates, but clinical complications can and do occur. It has been suggested that perfect adaptation, or so-called passive fit, should exist to minimize stresses on prosthetic components and bone tissue.1 An illfitting interface could have deleterious effects on mechanical and biologic aspects of the prosthesis. A passive fit that induces no stress or strains is utopic. Distortion is unavoidable, regardless of the method used to fabricate prosthetic frameworks. Still, minimum misfit should be sought when making implant prostheses. To accomplish this, alternatives to conventional one-piece casting (OPC) procedures were suggested in the literature, such as framework cemented on prepared abutments (FCPA) and laser welding (LW) techniques.2,3 However, to date, there are no studies comparing adaptation between these techniques and OPC for implant-supported fixed partial dentures.

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