The more familiar high performance polymer poly ether ether ketone (PEEK) has been employed in dentistry for many years for temporary restorations, for scanning and as impression posts. This also belongs to the PAEK group of polymers (poly aryl ether ketones). The synthesis of PEKK was started in 1962 by the DuPont chemicals group, which since then has refined polymerization over the following decades.
The later PEKK synthesis was adapted by Oxford Performance Materials and Arkema, who initiated market introduction of the material into numerous industry segments. The major advantage of PEKK over PEEK is the higher creep resistance and its contour retention under stress loading.