Viscoelasticity and aging of dental composites.
Effects of aging on several dental composites were studied using a torsion creep apparatus. A constant torque was applied from 1 second to 3 hours, and recovery was observed from 10 seconds to 2 days, for specimens aged from 3 hours to 8 weeks following polymerization. Specimens aged for shorter times exhibited more creep and less complete recovery than specimens aged for longer times. Modulus and creep results were qualitatively consistent with a composite model for particulate inclusions.
Department of Operative Dentistry, University of Iowa, Iowa City 52242, USA.
D B
DB
Boyer
Y
Y
Papadogiannis
H C
HC
Park
R S
RS
Lakes
D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D013314:Stress, Mechanical; D013997:Time Factors; D019415:Torque; D014783:Viscosity
D003188:Composite Resins; C036885:prisma-fil; D017438:Bisphenol A-Glycidyl Methacrylate