title: Properties of injection-molded thermoplastic polyester denture base resins.
abstract: OBJECTIVE
  This study investigated the properties of injection-molded thermoplastic polyester denture base resins.
  
  
  METHODS
  Two injection-molded thermoplastic polyester denture base resins (polyethylene terephthalate copolymer and polycycloalkylene terephthalate copolymer) were tested. Specimens of each denture base material were fabricated for flexural properties testing, Charpy impact testing and shear bond testing (n = 10). The flexural strength at the proportional limit, elastic modulus, Charpy impact strength and the shear bond strength of the two denture base materials were estimated.
  
  
  RESULTS
  The polycycloalkylene terephthalate copolymer denture base resin had significantly lower flexural strength at the proportional limit, lower elastic modulus, higher impact strength and lower shear bond strength compared to the polyethylene terephthalate copolymer denture base resin.
  
  
  CONCLUSIONS
  The properties of the injection-molded thermoplastic denture base resins composed of polyethylene terephthalate copolymer and polycycloalkylene terephthalate copolymer were different from each other. The polycycloalkylene terephthalate copolymer denture base resin had significantly lower flexural strength at the proportional limit, lower elastic modulus, higher impact strength and lower shear bond strength compared to the polyethylene terephthalate copolymer denture base resin.
authors.affiliation: Division of Removable Prosthodontics, Fukuoka Dental College , Fukuoka , Japan.
authors.forename: Ippei
authors.initials: I
authors.lastname: Hamanaka
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shimizu
mesh_terms: D000180:Acrylic Resins; D000704:Analysis of Variance; D003819:Denture Bases; D011091:Polyesters
chemical_list: D000180:Acrylic Resins; D011091:Polyesters