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http://dx.doi.org/10.5395/JKACD.2011.36.2.108

Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites  

Park, Hye-Jung (Dept. of Conservative Dentistry, Pusan National University School of Dentistry)
Son, Sung-Ae (Dept. of Conservative Dentistry, Pusan National University School of Dentistry)
Hur, Bock (Dept. of Conservative Dentistry, Pusan National University School of Dentistry)
Kim, Hyeon-Cheol (Dept. of Conservative Dentistry, Pusan National University School of Dentistry)
Kwon, Yong-Hoon (Dept. of Dental Materials, Pusan National University School of Dentistry and Medical Research Institute)
Park, Jeong-Kil (Dept. of Conservative Dentistry, Pusan National University School of Dentistry)
Publication Information
Restorative Dentistry and Endodontics / v.36, no.2, 2011 , pp. 108-113 More about this Journal
Abstract
Objectives: To determine the effect of the spectral output of single and dual-peak light emitting diode (LED) curing lights on the microhardness and color stability of commercial resin composites formulated with camphorquinone and alternative photoinitiators in combination. Materials and Methods: Three light-polymerized resin composites (Z100 (3M ESPE), Tetric Ceram (Ivoclar Vivadent) and Aelite LS Posterior (Bisco)) with different photoinitiator systems were used. The resin composites were packed into a Teflon mold (8 mm diameter and 2 mm thickness) on a cover glass. After packing the composites, they were light cured with single-peak and dual-peak LEDs. The Knoop microhardness (KHN) and color difference (${\Delta}E$) for 30 days were measured. The data was analyzed statistically using a student's t-test (p < 0.05). Results: All resin composites showed improved microhardness when a third-generation dual-peak LED light was used. The color stability was also higher for all resin composites with dual-peak LEDs. However, there was a significant difference only for Aelite LS Posterior. Conclusions: The dual-peak LEDs have a beneficial effect on the microhardness and color stability of resin composites formulated with a combination of camphorquinone and alternative photoinitiators.
Keywords
Alternative photoinitiators; Camphorquinone; Color stability; Dual-peak light emitting diode (LED); Microhardness; Spectral outputs;
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Times Cited By KSCI : 3  (Citation Analysis)
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