PEKK is a liner thermoplastic polymer and consists of a benzene ring attached consecutively by ether or ketone- groups ( Fig. In addition, the extra ketone group in PEKK has strong polymer chains and shows better physical and mechanical properties, such as compressive strength. A PEKK with 60% straight and 40% kinked segments melts at 305 ☌ but PEEK with 80% straight and 20% kinked melts at 360 ☌. Moreover, PEKK displays both amorphous and crystalline behavior, and different products can be produced. PEKK has a second ketone group, and it increases polarity and backbone rigidity, which results in an increase in glass transition and melting temperature. There are some differences between PEKK and PEEK. The structure of PEEK and PEKK have aromatic rings, which differ in the ratio of ether- and keto- group ( Fig. The PAEK is a linear aromatic polyether ketone represented by ultrahigh molecular weight polyethylene. This article presents an overview of PEKK and its various applications in restorative, prosthetic, and implant dentistry. Available articles on PEKK for dental applications were reviewed from January 1957 to August 2020) were reviewed using MEDLINE/PubMed, Web of Science, and ScienceDirect resources. These incredible outcomes of PEEK as dental materials attracted the attention of researchers to study the other members of the PAEK family, PEKK. Promising applications of PEEK biomaterial are dental implant, temporary abutment and fixed prosthesis and removable denture, and finger prosthesis. The PEEK emerged in the late 1990s as a semi-crystalline material and showed excellent biological, mechanical, and physical properties for biomedical applications. PAEK family show ultra-high performance (superior mechanical performances with chemical resistant) among all thermoplastic composites linked to their processing parameters ( Fig. The PAEK family are thermoplastic polymers and have been in the engineering field since the 1980s and shows excellent mechanical properties and chemical resistance. The PEKK and polyetheretherketone (PEEK) are the two most well-known of the polyaryletherketone (PAEK) family. Their wide biomedical applications are because of its higher mechanical strength and the presence of the second ketone group that allows for more surface modification of its surface. The PEKK is a promising material in the field of cranial and orthopedic implants. The PEKK has a wide range of applications in restorative, prosthetic, and implant dentistry. Recently, PEKK has increasingly used as a biomaterial with properties suitable for dental and medical applications. PEKK was firstly introduced by Bonner in 1962, and since then, it has been used for different industrial and military purposes. The PEKK is a methacrylate-free thermoplastic high-performance material. Polyetherketoneketone (PEKK) is a new polymeric material that has attracted the attention of researchers because of its excellent properties that can be used in many applications. Various removable appliances, restorations, and denture base materials are fabricated from polymers. Polymers being one of the essential materials in dentistry, poses excellent physical, mechanical properties and are reported to have excellent biocompatibility. Long term evaluations are needed as PEKK is recently applied in dentistry, and there are limited studies published on PEKK. Further modifications and improving material properties can result in broader applications in the field of dentistry. PEKK dental implants have shown lesser stress shielding compared to titanium for dental implant applications. PEKK has good potential for a wide range of dental applications, including tooth restorations, crowns, bridge, endoposts, denture framework, implant-supported fixed prosthesis, and dental implants. PEKK presents suitable physical, mechanical, and chemical properties for applications in prosthodontics and oral implantology. Available articles on PEKK for dental applications were reviewed from January 1957 to August 2020) using MEDLINE/PubMed, Web of Science, and ScienceDirect resources. PEKK biomaterials is an elastic material with good shock absorbance and fracture resistance and present ultra-high performance among all thermoplastic composites for excellent mechanical strength, chemical resistance, and high thermal stability. The present article comprehensively reviewed an overview of various applications of PEKK in prosthodontics and oral implantology, highlighting its prospects for clinical applications. Polyetherketoneketone (PEKK) is a new evolving polymeric material.
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