title: Method to measure the polymerization shrinkage of light-cured composites.
abstract: The polymerization shrinkage of light-cured dental composite resins has been reported to cause a marginal gap between the cavity wall and the restoration, leading to the premature and/or tensile stress failure of the composite restoration. This study measured the volumetric shrinkage of six light-cured posterior composites by measuring specific gravity differences between uncured and cured composite test specimens, using a modified version of ASTM method D792 "Specific Gravity and Density of Plastics by Displacement." The measured volumetric shrinkage ranged from 1.35% to 3.22%.
authors.affiliation: Department of Restorative Dentistry, University of Mississippi, School of Dentistry, Jackson.
authors.forename: A D
authors.initials: AD
authors.lastname: Puckett
authors.forename: R
authors.initials: R
authors.lastname: Smith
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000737:chemistry*; D007101:Immersion; D008027:Light; D008422:Materials Testing / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D011791:Quartz / Q000737:chemistry; D019279:Resin Cements; D013046:Specific Gravity; D013499:Surface Properties; D014520:Urethane / Q000737:chemistry; D014867:Water
chemical_list: D003188:Composite Resins; D011108:Polymers; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D019279:Resin Cements; D014867:Water; C056413:Occlusin; C065770:Herculite XR; C067786:Visio-Molar; D011791:Quartz; C048711:P-30 composite resin; D014520:Urethane; D017438:Bisphenol A-Glycidyl Methacrylate; C046503:formula F 70