title: Effect of long-term water immersion or thermal shock on mechanical properties of high-impact acrylic denture base resins.
abstract: The purpose of this study was to investigate the effect of long-term water immersion or thermal shock on the mechanical properties of high-impact acrylic denture base resins. Two high-impact acrylic denture base resins were selected for the study. Specimens of each denture base material tested were fabricated according to the manufacturers' instructions (n=10). The flexural strength at the proportional limit, the elastic modulus and the impact strength of the specimens were evaluated. The flexural strength at the proportional limit of the high-impact acrylic denture base resins did not change after six months' water immersion or thermocycling 50,000 times. The elastic moduli of the high-impact acrylic denture base resins significantly increased after six months' water immersion or thermocycling 50,000 times. The impact strengths of the high-impact acrylic denture base resins significantly decreased after water immersion or thermocycling as described above.
authors.affiliation: Division of Removable Prosthodontics, Fukuoka Dental College.
authors.forename: Hirono
authors.initials: H
authors.lastname: Sasaki
authors.forename: Ippei
authors.initials: I
authors.lastname: Hamanaka
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Kawaguchi
mesh_terms: D000180:Acrylic Resins; D003819:Denture Bases; D055119:Elastic Modulus; D008422:Materials Testing; D013314:Stress, Mechanical; D014867:Water
chemical_list: D000180:Acrylic Resins; D014867:Water