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KMID : 1035320170440040367
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Korean Society for Dental Materials
2017 Volume.44 No. 4 p.367 ~ p.376
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Effects of light wavelength on the microhardenss and polymerization shrinkage of composite resins
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Kim Seung-Seo
Seol Hyo-Joung
Kwon Yong-Hoon
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Abstract
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As an activator of photoinitiator, the selection of a light source (wavelength) can affect the result of polymerization. This study examined how the wavelength of a light source affects the curing of composite resins. Four light-curing units (LCUs) (405, 457, and 473 nm lasers with 530 mW/cm2 and one light-emitting diode (LED) with 900 mW/cm2) and three composite resins (one only camphorquinone-containing and two camphorquinone+coinitiator-containing as an initiator) were used. To determine the degree of polymerization, the microhardness and polymerization shrinkage were assessed. On the top surface, two camphorquinone+coinitiator-containing specimens cured using the 473 nm laser showed slightly lower microhardness than those cured using the 405 and 457 nm lasers. However, specimen that contains only camphorquinone showed the lowest microhardness when cured using the 405 nm laser. On the bottom surface, the microhardness increased gradually as laser wavelength changed from 405 to 473 nm. The specimens cured using the LED LCU showed the highest polymerization shrinkage compared to that by the lasers. This study highlights the potential of blue lasers on the curing of various composite resins to the level that the LED LCU can achieve.
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KEYWORD
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Composite resin, Light wavelength, Microhardness, Polymerization shrinkage
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