Effects of gamma radiation on the in vitro wear of composite restorative materials.
The effects of gamma radiation at therapeutic dosage levels on the wear of three anterior (two light-cured and one autocured) composites and a light-cured posterior composite were studied in vitro. Specimens were subjected to successive sets of 100 abrades to a maximum of 500 abrades on a reciprocating arm abrader, with the dimensional change being recorded between the sets of abrades. The data showed that there were no significant effects on the wear rates of any of the materials tested. The rate of height loss was similar for the two hybrid composites tested (P less than 0.05), as was that for the microfilled and conventional material (P less than 0.05). There was, however, a significant difference (P greater than 0.001) in the wear behaviour between the two groups.
Curtis
P M
PM
School of Dentistry, University of Louisville, Kentucky 40292.
Farman
A G
AG
von Fraunhofer
J A
JA
D000180:Acrylic Resins / Q000737:chemistry / Q000528:radiation effects; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects*; D003793:Dental Restoration, Permanent; D005720:Gamma Rays; D006244:Hardness; D008422:Materials Testing; D011829:Radiation Dosage; D012995:Solubility; D013499:Surface Properties; D013718:Tensile Strength; D014867:Water
D000180:Acrylic Resins; D003188:Composite Resins; D014867:Water; C065771:P50 composite resin; C067319:valux; D017438:Bisphenol A-Glycidyl Methacrylate