title: The applicability of PEEK-based abutment screws.
abstract: The high-performance polymer PEEK (poly-ether-ether-ketone) is more and more being used in the field of dentistry, mainly for removable and fixed prostheses. In cases of screw-retained implant-supported reconstructions of PEEK, an abutment screw made of PEEK might be advantageous over a conventional metal screw due to its similar elasticity. Also in case of abutment screw fracture, a screw of PEEK could be removed more easily. M1.6-abutment screws of four different PEEK compounds were subjected to tensile tests to set their maximum tensile strengths in relation to an equivalent stress of 186MPa, which is aused by a tightening torque of 15Ncm. Two screw types were manufactured via injection molding and contained 15% short carbon fibers (sCF-15) and 40% (sCF-40), respectively. Two screw types were manufactured via milling and contained 20% TiO2 powder (TiO2-20) and >50% parallel orientated, continuous carbon fibers (cCF-50). A conventional abutments screw of Ti6Al4V (Ti; CAMLOG(®) abutment screw, CAMLOG, Wimsheim, Germany) served as control. The maximum tensile strength was 76.08±5.50MPa for TiO2-20, 152.67±15.83MPa for sCF-15, 157.29±20.11MPa for sCF-40 and 191.69±36.33MPa for cCF-50. The maximum tensile strength of the Ti-screws amounted 1196.29±21.4MPa. The results of the TiO2-20 and the Ti screws were significantly different from the results of the other samples, respectively. For the manufacturing of PEEK abutment screws, PEEK reinforced by >50% continuous carbon fibers would be the material of choice.
authors.affiliation: Dental Materials and Biomaterial Research, Department of Prosthodontics, School of Dentistry Charité-University Medicine Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
authors.forename: Andreas Dominik
authors.initials: AD
authors.lastname: Schwitalla
authors.affiliation: Beuth University of Applied Sciences, Luxemburger Str. 10, 13353 Berlin, Germany.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Abou-Emara
authors.affiliation: Dental Materials and Biomaterial Research, Department of Prosthodontics, School of Dentistry Charité-University Medicine Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
authors.forename: Tycho
authors.initials: T
authors.lastname: Zimmermann
authors.affiliation: Dental Materials and Biomaterial Research, Department of Prosthodontics, School of Dentistry Charité-University Medicine Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Spintig
authors.affiliation: Head of the Department of Prosthodontics, School of Dentistry Charité-University Medicine Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Beuer
authors.affiliation: Beuth University of Applied Sciences, Luxemburger Str. 10, 13353 Berlin, Germany.
authors.forename: Justus
authors.initials: J
authors.lastname: Lackmann
authors.affiliation: Dental Materials and Biomaterial Research, Department of Prosthodontics, School of Dentistry Charité-University Medicine Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany. Electronic address: wolf-dieter.mueller@charite.de.
authors.forename: Wolf-Dieter
authors.initials: WD
authors.lastname: Müller
mesh_terms: D001577:Benzophenones; D001863:Bone Screws; D000044:Dental Abutments; D015921:Dental Implants; D003799:Dental Stress Analysis; D007659:Ketones / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers; D013718:Tensile Strength; D019415:Torque
chemical_list: D001577:Benzophenones; D015921:Dental Implants; D007659:Ketones; D011108:Polymers; C063834:polyetheretherketone; D011092:Polyethylene Glycols
keywords: Abutment screws; Carbon fibers; Dental implantology; PEEK; Tensile test