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ePaper created 2016-10-04, 09:33:57 | version 1.38.0
| review thermoplastic materials 18 CAD/CAM 3 2016 however, is that thermoplastic materials cannot be repaired. There is no way of repairing cracks or frac- tures. The only solution is to make a new denture. PEEK PEEK (Polyetheretherketone) was first used for tele- scopic dentures about six years ago. In general medi- cine, it has been used for hip, knee and intervertebral disc implants for almost 15 years. According to Ger- man company Evonik Industries, as many as four millionimplantshavebeenfittedandnotasinglecase of proven allergy to that material has been reported. The modulus of elasticity of PEEK is similar to that of bone, with positive consequences for integration. This is one of the reasons that PEEK merits the atten- tion of dental laboratory technicians. Finally, there is amaterialwithahardnesssimilartothatofbone,not assoftasPAorFPMplasticsandnotashardasPMMA. These very rigid materials often cause dental techni- cians problems, for example with all-ceramic solu- tions for the upper jaw, where craniomandibular problems frequently arise. PEEK is a very light-weight material with a long his- tory of use in space flight. Non-conductive, it has been used in semiconductor technology for a long time. This property also offers benefits for use in the oral cavity. ThepharmaceuticalindustryusesPEEKinproduction. Parts in contact with the product are made of PEEK owing to its low discoloration and high resistance to wear and corrosion. Both properties are also very useful for dental technology. PEEK is indicated for removable, as well as condi- tionally removable, prostheses. Therefore, bridges, crowns,telescopicdenturesandattachments,aswell as screwretained superstructures, can be fabricated. Fig. 10 Fig. 11 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 32016