Korean J Dent Mater.  2018 Sep;45(3):179-186. 10.14815/kjdm.2018.45.3.179.

Effect of 457 nm light on the polymerization of dental composite resins

Affiliations
  • 1Professor, Department of Biomedical Engineering, School of Medicine, Pusan National University, Busan, Korea.
  • 2Dentist, Department of Dental Materials, School of Dentistry, Pusan National University, Yangsan, Korea.
  • 3Professor, Department of Dental Materials, School of Dentistry, Pusan National University, Yangsan, Korea. y0k0916@pusan.ac.kr

Abstract

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/cm2 and 900 mW/cm2, 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.

Keyword

Composite resin; Laser; Microhardness; Degree of conversion
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