title: Three-unit reinforced polyetheretherketone composite FDPs: influence of fabrication method on load-bearing capacity and failure types.
abstract: To investigate the influence of different fabrication methods of three-unit reinforced polyetheretherketone composite (PEEK/C) fixed dental prostheses (FDPs) on fracture load. Forty-five three-unit anatomically supported PEEK/C FDPs were fabricated as follows: i. milled using a CAD/CAM system from an industrially fabricated PEEK/C blank, ii. pressed from industrially fabricated PEEK/C pellets, and iii. pressed from granular PEEK/C. Fracture load was measured and data were statistically analysed (p<0.05). CAD/CAM fabricated FDPs (2,354 N) presented a higher mean fracture load than those pressed from granular PEEK/C material (1,738 N) (p<0.001). CAD/CAM milled FDPs and those pressed from PEEK/C-pellets showed spontaneous and brittle fractures near the pontic without deformation of the FDP. In contrast, granulate pressed FDPs showed some plastic deformation without fracture. CAD/CAM fabricated FDPs, and FDPs pressed from PEEK/C pellets showed higher Weibull moduli compared to FDPs pressed in granular form. Industrial pre-pressing of blanks (CAD/CAM/pellet) increased the stability and reliability of PEEK restorations.
authors.affiliation: Department of Prosthodontics, Dental School, Ludwig-Maximilians-University Munich.
authors.forename: Bogna
authors.initials: B
authors.lastname: Stawarczyk
authors.forename: Marlis
authors.initials: M
authors.lastname: Eichberger
authors.forename: Julia
authors.initials: J
authors.lastname: Uhrenbacher
authors.forename: Timea
authors.initials: T
authors.lastname: Wimmer
authors.forename: Daniel
authors.initials: D
authors.lastname: Edelhoff
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Schmidlin
mesh_terms: D001577:Benzophenones; D001672:Biocompatible Materials / Q000737:chemistry*; D017076:Computer-Aided Design; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003830:Denture, Partial, Fixed; D007659:Ketones / Q000737:chemistry*; D008422:Materials Testing; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers; D015203:Reproducibility of Results
chemical_list: D001577:Benzophenones; D001672:Biocompatible Materials; D007659:Ketones; D011108:Polymers; C063834:polyetheretherketone; D011092:Polyethylene Glycols