K. STAMOULIS, D. TORTOPIDIS
Department of Fixed Prosthodontics and Implant Prosthetics, Dental School, Aristotle University of Thessaloniki, Greece
Among different techniques for a custom provisional fixed partial denture construction, the indirect-direct one is a well-established method. It can be completed in the dental office, reducing the overhead cost of producing fixed prostheses. During the first (indirect) phase of this technique, a PMMA (methyl methacrylate) material is used for a shell to be fabricated extraorally. A reline procedure that takes place intraorally is the second (direct) phase necessary to complete the provisional bridge construction. A PR’MA (R’ = ethyl, vinyl, isobutyl) material is used for relining.
A modification of the above technique is proposed using a light-polymerizing PEMA (or ethyl methacrylate) material instead of an autopolymerizing PEMA material. This material exhibits partial setting from a chemical reaction but depends on light for complete setting. Following final curing, it then behaves with the same physical properties as other materials in its class, minimizing the danger for tooth vitality and the risk of locking the restoration in place.