Light-emitting diode curing: influence on selected properties of resin composites.
OBJECTIVE
Two recently marketed light-emitting diode polymerization units were compared with a conventional halogen curing unit. Selected properties of resin composites polymerized with the three curing units were determined.


METHODS
Three different brands of resin composite were used in the investigation. The properties that were determined were flexural strength and modulus, determined in three-point bending tests; depth of polymerization, assessed by removal of uncured material after irradiation; polymerization contraction, evaluated with the bonded-disk method; and degree of conversion, measured by Fourier transform infrared spectroscopy.


RESULTS
The properties of resin composites polymerized with light-emitting diode curing units were equal or inferior to properties obtained after halogen light curing.


CONCLUSIONS
Although several properties with some combinations of resin composite and light-emitting diode curing unit were inferior to properties obtained with the halogen curing unit, both the flexural strength and the depth of polymerization fulfilled the requirements set by the International Standards Organization.
Asmussen
Erik
E
Department of Dental Materials, School of Dentistry, University of Copenhagen, Copenhagen, Denmark. ea@odont.ku.dk
Peutzfeldt
Anne
A
D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects*; D004548:Elasticity; D006801:Humans; D008027:Light; D008029:Lighting / Q000295:instrumentation; D008422:Materials Testing; D018583:Pliability; D011108:Polymers / Q000737:chemistry / Q000528:radiation effects; D012833:Siloxanes / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013314:Stress, Mechanical; D013499:Surface Properties; D013729:Terpenes / Q000737:chemistry
D003188:Composite Resins; C421785:Definite composite resin; C444701:Filtek Z250; C079764:Pertac hybrid; D011108:Polymers; D012833:Siloxanes; D013729:Terpenes; D017438:Bisphenol A-Glycidyl Methacrylate