Thermoplastic composites for veneering posterior teeth—a feasibility study

• Published in: Dental materials Vol. 18; no. 6; pp. 479 - 485
• Main Authors: Gegauff, Anthony G, Garcia, Jose L, Koelling, Kurt W, Seghi, Robert R
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.09.2002
• Subjects: Analysis of Variance; Composite Resins - chemistry; Compressive Strength; Dental Veneers; Elasticity; Feasibility Studies; Fluorocarbons - chemistry; Glass - chemistry; Humans; Mechanical properties; Pilot Projects; Plastics - chemistry; Pliability; Polycarboxylate Cement - chemistry; Polymers - chemistry; Polytetrafluoroethylene - analogs & derivatives; Polytetrafluoroethylene - chemistry; Polyurethanes - chemistry; Posterior dental crown restorations; Statistics as Topic; Stress, Mechanical; Surface Properties; Temperature; Thermoplastic resin composites; Mechanical properties; Posterior dental crown restorations; Thermoplastic resin composites
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/S0109-5641(01)00073-2

Objectives: This pilot study was conducted to explore selected commercially-available thermoplastic composites that potentially had physical properties superior to currently available dental systems for restoring esthetic posterior crowns. Methods: Polyurethane, polycarbonate, and poly(ethylene/tetrafluoroethylene) (ETFE) composites and unfilled polyurethane specimens were injection molded to produce shapes adaptive to five standardized mechanical tests. The mechanical testing included abrasive wear rate, yield strength, apparent fracture toughness (strength ratio), flexural strength, and compressive strength. Results: Compared to commercially available dental composites, abrasion wear rates were lower for all materials tested, yield strength was greater for the filled polycarbonates and filled polyurethane resins, fracture toughness testing was invalid (strength ratios were calculated for comparison of the pilot test materials), flexural strength was roughly similar except for the filled ETFE which was significantly greater, and compressive strength was lower. Significance: Commercially available thermoplastic resin composites, such as polyurethane, demonstrate the potential for development of an artificial crown material which exceeds the mechanical properties of currently available esthetic systems, if compressive strength can be improved.