Effect of LED curing on microleakage and microhardness of Class V resin-based composite restorations.
BACKGROUND
Polymerisation shrinkage is a critical limitation of dental composites and may contribute to microleakage, postoperative pain, tooth fracture, and secondary caries. It has been shown that curing methods play a significant role in polymerisation shrinkage of light-cured dental resins. The purpose of this study was to investigate the effect of a LED curing light on microleakage as well as microhardness of a dental composite.


METHODS
For the microleakage test 32 Class V cavities were prepared in human premolars, conditioned with 35% phosphoric acid and treated with the bonding agent Prime & Bond NT. They were then incrementally filled with the composite Esthet-X and randomly divided into two groups of 16 each. The first group was cured by means of a Spectrum 800 set at 500 mW/cm2 for 40 seconds and the second group with the GC E-Light in standard mode. The specimens were thermo-cycled in a 0.5% basic fuchsin solution, sectioned and evaluated for dye penetration. For the microhardness test two groups of 6 specimens each were exposed using either the LED- or the Halogen curing unit. Vickers microhardness tests were performed immediately after curing as well as 24 hours later, on the top, and at the bottom surface.


RESULTS
At the dentine/cementum interface, significantly less microleakage (p=0.004) was found when the restorations were cured with the LED-unit. At the enamel interface no significant difference (p=0.340) in microleakage was found between curing methods. Immediately after exposure significantly harder surfaces were found at the top (p<0.001) as well as at the bottom (p<0.001), using the halogen unit (p<0.05).


CONCLUSIONS
Although a reduction in microleakage could be demonstrated exposing the composite restoration to an LED LCU, an effective microhardness ratio was not achieved.
Department of Operative Dentistry, P.O. Box D18, Medunsa 0204, South Africa. TGO@SUN.AC.ZA
Theunis G
TG
Oberholzer
Marita
M
Schünemann
Martin
M
Kidd
D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000528:radiation effects*; D003737:Dental Cavity Preparation; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent; D006244:Hardness; D006801:Humans; D008027:Light; D008422:Materials Testing; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry; D011109:Polymethacrylic Acids; D019279:Resin Cements; D012666:Semiconductors
D003188:Composite Resins; C466112:Esthet-X; D011108:Polymers; D011109:Polymethacrylic Acids; C103500:Prime & Bond; D019279:Resin Cements; D017438:Bisphenol A-Glycidyl Methacrylate