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Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites
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Hye-Jung Park, Sung-Ae Son, Bock Hur, Hyeon-Cheol Kim, Yong-Hoon Kwon, Jeong-Kil Park
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J Korean Acad Conserv Dent 2011;36(2):108-113. Published online March 31, 2011
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DOI: https://doi.org/10.5395/JKACD.2011.36.2.108
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 Abstract
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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 (ΔE) 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.
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Citations
Citations to this article as recorded by  - Effect of irradiance from curing units on the microhardness of composite - a systematic review
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Evidence-Based Dentistry.2022;[Epub] CrossRef - Micro-computed tomography evaluation of volumetric polymerization shrinkage and degree of conversion of composites cured by various light power outputs
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Dental Materials Journal.2018; 37(1): 33. CrossRef - Effect of the irradiance distribution from light curing units on the local micro-hardness of the surface of dental resins
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Chang-Gyu Kim, Ho-Jin Moon, Dong-Hoon Shin
Journal of Korean Academy of Conservative Dentistry.2011; 36(4): 313. CrossRef
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