![]() ![]() The thermal conductivity of PEEK is 0.29 W/mK, which is lower than that of zirconia and protects the abutment teeth from temperature fluctuations in the mouth. Notably, glass fiber reinforced- and carbon fiber reinforced-PEEK (GFR-PEEK, CFR-PEEK) exhibit an even more similar Young’ s modulus (12 GPa and 18 GPa) to human bone and dentin, along with greater flexural strength (170 MPa) and better color stability, providing more favorable outcomes. To address this, as shown in Table 1, PEEK can be blended with glass fibers or carbon fibers in order to enhance its mechanical strength. However, when compared with conventional materials, the stiffness of PEEK (tensile strength 110 MPa) is not sufficient to sustain the load-bearing stress. Given its deformability, PEEK can provide more balanced stress distribution, limiting stress-shielding when serving as an implant and lowering the risk of root fracture when used for post-and-core restoration. PEEK exhibits excellent mechanical properties, including a low Young’s modulus (3 to 4 GPa), which, compared to metal alloys (110 to 130 GPa), is closer to that of human cortical bone (14 GPa). Improvement strategies are summarized later in this article. In terms of its disadvantages, PEEK has an inert and poorly adhesive hydrophobic surface (surface contact angle, θ at 65°) that is an important obstacle to its wider application in fixed prosthodontics. In addition, PEEK is radiolucent and generates few imaging artifacts, providing significantly better performance than zirconia and metal alloys. Furthermore, because of its aromatic chemical structure, PEEK is resistant to the gamma and electron beams that are commonly used for sterilization. Because of this, PEEK not only prolongs the lifespan of a prosthesis, but also protects the abutment teeth and other adjacent tissues. Regarding its advantages, PEEK resists high-temperature thermal stress (melting point, 343 ☌) without significant degradation, shows low water solubility (0.5%), and is able to minimize biocorrosion within body fluid, thus avoiding the release of metal ions that can trigger cytotoxicity, allergy, and inflammation. ![]() PEEK consists of an aromatic nucleus linked by ketone and ether groups, providing it with a superior chemical stability that seems to be a double-edged sword. PEEK is a high impact polymer material that is made from fluorine benzene ketone, hydroquinone, and sodium carbonate or potassium carbonate, dissolved in diphenyl sulfone. Polyetheretherketone (PEEK), a member of the polyaryletherketone (PAEK) family, has recently emerged as a promising alternative material for fixed dental prostheses. ![]()
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