Effect of diode-pumped solid state laser on polymerization shrinkage and color change in composite resins.
A diode-pumped solid state (DPSS) laser emitting at 473 nm was used to test its influence on the degree of polymerization of composite resins. Eight composite resins were chosen and light cured with three different light-curing systems [a quartz-tungsten-halogen (QTH) lamp-based unit, a light-emitting diode (LED) unit, and a DPSS laser]. Polymerization shrinkage and color change in specimens were measured. According to the statistical analysis, each light-curing system produced a significantly different value of maximum polymerization shrinkage. In most specimens, the DPSS laser induced the least polymerization shrinkage. After being immersed in distilled water for 10 days, specimens light-cured by the DPSS laser had undergone less color change than those cured by the other units. In conclusion, the DPSS laser induced better or similar polymerization in terms of polymerization shrinkage and color change in composite resins compared with those of the QTH lamp-based and LED units.
Jung
Yun-Hoa
YH
College of Dentistry and Medical Research Institute, Pusan National University, Busan, South Korea.
Cho
Bong-Hae
BH
Nah
Kyung-Soo
KS
Kim
Hyung-Il
HI
Kwon
Yong Hoon
YH
D003116:Color; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects*; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State / Q000009:adverse effects* / Q000627:therapeutic use; D055115:Light-Curing of Dental Adhesives / Q000009:adverse effects* / Q000379:methods
D003188:Composite Resins