Effects of post-curing on mechanical properties of a composite.
The mechanical properties (diametral tensile strength, compressive strength, modulus of elasticity in compression, Knoop hardness, and Rockwell Superficial indentation and recovery) were measured for one light-cured composite (Herculite XRV) post-cured by five different conditions. The post-curing conditions were: boiling water, CRC-100, D.I.-500, Translux EC Light Box, and Triad 2000 with normal light curing as a control. Post-curing Herculite XRV significantly improved the diametral tensile strength (24-39%), Knoop hardness (8-22%) and Rockwell Superficial recovery (3-6%); decreased Rockwell Superficial indentation (0-19%) but did not affect the compressive strength significantly. Modulus of elasticity was not affected, except by the Translux EC Light Box, which increased the modulus by 33%. Post-curing Herculite XRV with the Triad 2000 and Translux EC Light Box produced the most improved properties. Water at 100 degrees C was the least effective of the post-curing methods.
Powers
J M
JM
Department of Oral Biomaterials, University of Texas-Houston Health Science Center, Dental Branch 77225.
Smith
L T
LT
Eldiwany
M
M
Ladd
G D
GD
D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000379:methods*; D004548:Elasticity; D006244:Hardness; D008027:Light; D008422:Materials Testing; D019279:Resin Cements; D013718:Tensile Strength
D003188:Composite Resins; D019279:Resin Cements; C065770:Herculite XR