A thermoplastic material intended to be used in the dental laboratory to manufacture a patient-worn dental appliance (e.g., denture/denture base, orthodontic retainer, implant bars, crowns/bridges, occlusal splint, mouthguard); it might in addition be intended to fabricate non-patient worn devices (e.g., dental impression tray). The material [e.g., nylon 12 beads, polyetheretherketone (PEEK) milling blank, thermoplastic sheet] is manipulated [e.g., by melting and moulding, or computer-aided techniques (dental CAD/CAM)] to form the shape needed for the patient. After application, this material cannot be refabricated.