title: Water sorption and dimensional changes of denture base polymer reinforced with glass fibers in continuous unidirectional and woven form.
abstract: OBJECTIVE
  The aim of this study was to determine the dimensional accuracy and water sorption of a denture base polymer that was reinforced with glass fibers in continuous unidirectional and woven form in different weight fractions.
  
  
  METHODS
  Ten rhombic brass plates were prepared with reference points, and 70 heat-cured denture base polymer specimens were produced using these brass models. Ten of 70 were used for controls, and 60 were reinforced with glass fibers in continuous parallel and woven form. The dimensional changes of polymer and fiber-reinforced composite specimens after processing, drying for 4 days at 37 degrees C, and storage in 37 degrees C water for 90 days were calculated by the change of the distance vector. The measurements were made between the reference points on the specimens and were compared with those on the brass model at 4 different stages. The water sorption calculations were made at 10 different time intervals on 70 specimens, which were immersed in a 37 degrees C distilled water bath and weighed.
  
  
  RESULTS
  The polymerization shrinkage and water sorption of denture base polymers is lower when the specimens are reinforced with glass fibers in continuous unidirectional and woven form. The highest fiber content showed the smallest dimensional change (0.069 mm, or 0.25%), and the unreinforced group showed the largest change (0.139 mm, or 0.54%). Water sorption occurred mainly during the first 14 days.
  
  
  CONCLUSIONS
  As the fiber content increases, the dimensional change and water sorption decrease.
authors.affiliation: Hacettepe University Faculty of Dentistry, Department of Prosthodontics, 06100 Ankara, Turkey.
authors.forename: N E
authors.initials: NE
authors.lastname: Cal
authors.forename: N
authors.initials: N
authors.lastname: Hersek
authors.forename: E
authors.initials: E
authors.lastname: Sahin
mesh_terms: D000042:Absorption; D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D003819:Denture Bases; D005898:Glass / Q000737:chemistry*; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry; D018709:Statistics, Nonparametric; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D011108:Polymers; C009753:fiberglass; D014867:Water