title: Assessment of clasp design and flexural properties of acrylic denture base materials for use in non-metal clasp dentures.
abstract: OBJECTIVE
  The purpose of this study was to investigate the possibilities of utilizing new acrylic denture base materials in resin clasps using three-point flexural tests and cantilever beam tests.
  
  
  METHODS
  Seven non-metal clasp denture (NMCD) materials and four acrylic denture base materials were used for three-point flexural tests and six NMCD materials and three acrylic denture base materials were used for cantilever beam tests. The flexural strength, elastic modulus, and 0.05% proof stress were measured by three-point flexural tests according to International Organization for Standardization (ISO) 20795-1. And load at 0.5mm deformation, elastic modulus were measured by Cantilever beam tests.
  
  
  RESULTS
  For the three-point flexural tests, only materials that met the conditions for both flexural strength and elastic modulus were the polycarbonate Reigning N (REN) and the acrylics Acron (AC), Pro Impact (PI), Procast DSP (PC) and IvoBase High Impact (HI) which are required in ISO 20795-1, Type 3 denture base materials. And for cantilever beam tests there was no significant difference between PI and either EstheShot (ES), EstheShot Bright (ESB), REN or Acry Tone (ACT) in load at 0.5mm deformation, and no significant difference between PI and either Lucitone FRS (LTF), ES, ESB, REN or ACT in elastic modulus.
  
  
  CONCLUSIONS
  The results thus suggested that some of the acrylic materials used as denture base materials may also be usable for NMCDs, and that the flexural properties of the acrylic material PI resemble those of ES, ESB and ACT, meaning that similar clasp designs may also be feasible.
authors.affiliation: Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, Japan; Nihon University Graduate School of Dentistry at Matsudo, Japan. Electronic address: yoshihiro.iwata.jp@gmail.com.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Iwata
mesh_terms: D000180:Acrylic Resins; D055598:Chemical Phenomena; D016734:Dental Clasps; D003764:Dental Materials; D003819:Denture Bases; D003779:Denture Design; D008670:Metals
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D008670:Metals
keywords: Acrylic denture base materials; Flexural properties; Non-metal clasp denture; Resin clasp; Thermoplastic denture base resin