title: Effect of water sorption on the resistance to plastic deformation of a denture base material relined with four different denture reline materials.
abstract: OBJECTIVE
  The effect of water sorption on the flexural strength at the proportional limit (FSp) of a denture base material relined with four different denture reline materials was studied.
  
  
  METHODS
  Denture base specimens were relined either after 24 hours or 30 days of water immersion. The relined specimens were tested after another period of 24 hours or 30 days of water immersion.
  
  
  RESULTS
  Relined denture specimens generally exhibited lower FSp with an increase in water immersion time and an increase in the thickness of the reline material.
  
  
  CONCLUSIONS
  The plasticizing effect of absorbed water molecules explains the general decrease in FSp of immersed relined specimens. The absence of a significant effect that water immersion had on some relined specimens under certain immersion conditions was explained by water sorption into the denture base achieving an equilibrium after a period of water immersion, and the resistance of some reline materials to the effect of water immersion.
authors.affiliation: Department of Removable Prosthodontics, Fukuoka Dental College, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Takahashi
authors.forename: J
authors.initials: J
authors.lastname: Chai
authors.forename: M
authors.initials: M
authors.lastname: Kawaguchi
mesh_terms: D000704:Analysis of Variance; D003764:Dental Materials / Q000737:chemistry*; D003823:Denture Rebasing / Q000379:methods* / Q000706:statistics & numerical data; D006801:Humans; D007101:Immersion; D008422:Materials Testing / Q000379:methods / Q000706:statistics & numerical data; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D003764:Dental Materials; D014867:Water