Use of Wax and Resin Patterns in Global Fixed Prosthetic Rehabilitation

Abstract

In clinical situations of complete rehabilitation with fixed prostheses, mastering each parameter of all restorations (shape, marginal adaptation, proximal and occlusal contacts) proves to be a challenge. The large number of restorations involves many potential adjustments that are time-consuming and lead to final ceramic properties degradation. This clinical report highlights the benefits of using castable patterns in complete fixed prosthetic rehabilitation. Minimal preparations of the teeth were carried out using the conventional mock-up technique. The impressions were then digitized to produce wax and resin patterns (Castable Wax Resin; Formlabs) with a stereolithography 3D printer (Form 2; Formlabs). During oral try-in of patterns, adjustments can be carried out to correct any defects of shape, marginal adaptation, proximal, and occlusal contacts. The definitive restorations were directly pressed from the patterns into lithium disilicate glass-reinforced ceramic (IPS e.max Press; Ivoclar Vivadent) using the lost-wax casting process. Finally, the restorations were placed permanently in the mouth with complete patient satisfaction after 4 years of follow-up. This procedure is intended to reduce ceramic adjustments on definitive restorations. It is especially relevant in complete fixed rehabilitation and in situations where the thickness of ceramic restorations does not allow for try-in before bonding.