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KMID : 1035320180450030179
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Korean Society for Dental Materials
2018 Volume.45 No. 3 p.179 ~ p.186
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Effect of 457 nm light on the polymerization of dental composite resins
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Ro Jung-Hoon
Yi Dong-Ho
Seol Hyo-Joung
Kwon Yong-Hoon
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Abstract
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The aim of this study was to determine if a 457 nm blue laser could effectively polymerize dental composite resins. After light curing 6 dental composite resins using a laser or a LED light-curing unit at 530 mW/㎠ and 900 mW/c㎠, respectively, degree of conversion and microhardness were evaluated. Degree of conversion of specimens by the laser and LED was similar (on top surface 54.4-67.7% and 55.2-67.1%, respectively; on bottom surface 35.1-53.8% and 45.4-53.1%, respectively). Microhardness was also similar (on top surface 28.5-83.6 Hv and 19.1-82.4 Hv, respectively; on bottom surface 22.5-65.4 Hv and 16.8-74.4 Hv, respectively), although, in some cases, laser-treated specimens showed slightly lower microhardness than the LED-treated on bottom surface. The present study shows that the 457 nm laser can polymerize dental composite resins to the same level as LED achieved.
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KEYWORD
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Composite resin, Laser, Microhardness, Degree of conversion
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