title: Measuring polymerization shrinkage of photo-activated restorative materials by a water-filled dilatometer.
abstract: A water-filled dilatometer specifically designed for determining the polymerization shrinkage of photo-activated composite restorative materials was used to measure the polymerization shrinkage of three visible light-activated composites. Polymerization shrinkage values ranged from 1.82% for P-50 to 2.15% and 2.19% for Herculite XRV and Prisma APH, respectively. Shrinkage data obtained in this investigation were compared with the published data, and the factors which affect shrinkage measurements were reviewed. It was concluded that maintaining a constant temperature environment (+ or - 0.02 degrees C) for the dilatometer during the shrinkage test was the most critical factor for successful application of the dilatometer.
authors.affiliation: Lai Laboratories, Inc., Burnsville, MN, USA.
authors.forename: J H
authors.initials: JH
authors.lastname: Lai
authors.forename: A E
authors.initials: AE
authors.lastname: Johnson
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D005069:Evaluation Studies as Topic; D006244:Hardness; D008027:Light; D008422:Materials Testing / Q000295:instrumentation* / Q000379:methods; D011108:Polymers / Q000737:chemistry; D015203:Reproducibility of Results; D019279:Resin Cements; D014867:Water
chemical_list: D003188:Composite Resins; D011108:Polymers; D019279:Resin Cements; D014867:Water; C065770:Herculite XR; C065771:P50 composite resin; C073466:Prisma APH; D017438:Bisphenol A-Glycidyl Methacrylate