Effect of 457 nm light on the polymerization of dental composite resins
10.14815/kjdm.2018.45.3.179
- Author:
Jung Hoon RO
1
;
Dong Ho YI
;
Hyo Joung SEOL
;
Yong Hoon KWON
Author Information
1. Professor, Department of Biomedical Engineering, School of Medicine, Pusan National University, Busan, Korea.
- Publication Type:Original Article
- Keywords:
Composite resin;
Laser;
Microhardness;
Degree of conversion
- MeSH:
Composite Resins;
Polymerization;
Polymers
- From:
Korean Journal of Dental Materials
2018;45(3):179-186
- CountryRepublic of Korea
- Language:English
-
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.
