Static and dynamic moduli of composite restorative materials.
A series of polymeric composite restorative materials cured by primary and secondary methods was examined by static and dynamic testing. The static modulus of elasticity, dynamic and modulus and glass-transition temperature were determined over a three-month period with the intention of characterizing monomer conversion. Heat and pressure curing of one material gave good conversion, but not all combinations of blue-light irradiation achieved full conversion. The use of a curing oven, whether as the primary or secondary mechanism did not result in a significant improvement in modulus. The use of a dynamic mechanical thermal analyser provided good data and this type of equipment is recommended for the characterization of polymeric materials.
Jacobsen
P H
PH
Department of Restorative Dentistry, University of Wales College of Medicine, Cardiff, UK.
Darr
A H
AH
D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004055:Differential Thermal Analysis; D004548:Elasticity; D008422:Materials Testing / Q000706:statistics & numerical data; D018583:Pliability; D011140:Polyurethanes / Q000737:chemistry
D000180:Acrylic Resins; C084111:Charisma composite resin; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; C090969:Tetric