Evaluation of Poly(etheretherketone) for Use as Innovative Material in the Fabrication of a Removable Partial Denture Framework

Since the 1930s, partial denture frameworks have generally been made from metallic alloys and resin polymers such as Cobalt-Chromium (Co-Cr) and Polymethylmethacrylate (PMMA). However, the main limitations of these materials over the last 15 years are related to their biocompatibility, long term performance and it seems neither of these materials meets the ideal properties for satisfactory results for long standing applications. Polyetheretherketone (PEEK) as a new thermoplastic polymer has been successfully used for medical purposes due to outstanding mechanical properties, thermal and chemical stability in implantations. PEEK shows promise for use instead of metals inside the human body.
The aim of this study is to evaluate PEEK polymer as an alternative material for use in the fabrication of removable partial denture frameworks. Initially the evaluation was by denture injection moulding method to explore the material’s physical properties, and then with CAD/CAM techniques the mechanical properties were investigated to consider these findings for design considerations. Clasps were then designed and the retentive force tested with thermo-cycling fatigue representing 3 years of insertion/removal. The significant findings of this study relate to its demonstration of the superior mechanical properties of PEEK polymer as a denture base material compared to PMMA, and the exceptional retentive force of the innovative clasp design at different tooth undercuts compared to the conventional Co-Cr clasp design. In conclusion, these study findings indicate the promise offered by PEEK thermoplastic polymer for future use as a denture material.