Yun Dong-In, Ku Ri-Mo, Son Sung-Ae, Park Jeong-Kil, Ko Ching-Chang, Kim Hyung-Il, Kwon Yong Hoon
Department of Dental Materials, School of Dentistry and Medical Research Institute, Pusan National University, Yangsan, Korea.
Photomed Laser Surg. 2012 Sep;30(9):536-42. doi: 10.1089/pho.2012.3231. Epub 2012 Jul 13.
The purpose of the present study was to investigate the effect of 473 nm diode-pumped solid state (DPSS) laser on the curing depth of composite resins.
Within the turbid media, light attenuates significantly because of the absorption and scattering.
For the study, three different composite resins and light-curing units (LCUs) (a quartz-tungsten-halogen [QTH], light-emitting-diode [LED], and DPSS laser) were used. The number of photons transmitted through the specimens, degree of conversion (DC), microhardness, and refractive index of the specimens on different thicknesses were evaluated.
The incident light exponentially decreased within the specimens. Among the LCUs, QTH showed the least photon loss. The DC obtained using the DPSS laser and QTH was significantly greater (p<0.001) than that obtained using LED. The specimens light cured using the DPSS laser showed slightly lower microhardness than that cured by the other LCUs. On each depth, the mean refractive index was not significantly different for the LCUs used. DC, microhardness, and refractive index had inverse linear correlation with specimen thickness despite exponential decrease of photons number. On the other hand, DC, microhardness, and refractive index were linearly correlated to each other regardless of LCUs.
The DPSS laser of 473 nm achieved a similar level of polymerization within the specimens as those of the other LCUs even with much lower light intensity. This laser can be applied as a light source for light curing of composite resins.
本研究旨在探讨473纳米二极管泵浦固体（DPSS）激光对复合树脂固化深度的影响。
在混浊介质中，光由于吸收和散射而显著衰减。
本研究使用了三种不同的复合树脂和光固化装置（LCU）（一种石英钨卤素灯[QTH]、发光二极管[LED]和DPSS激光）。评估了透过标本的光子数量、转化率（DC）、显微硬度以及不同厚度标本的折射率。
入射光在标本内呈指数下降。在这些光固化装置中，QTH的光子损失最少。使用DPSS激光和QTH获得的DC显著高于使用LED获得的DC（p<0.001）。用DPSS激光光固化的标本显示出的显微硬度略低于用其他光固化装置固化的标本。在所使用的光固化装置中，各深度处的平均折射率没有显著差异。尽管光子数量呈指数下降，但DC、显微硬度和折射率与标本厚度呈反线性相关。另一方面，无论光固化装置如何，DC、显微硬度和折射率彼此呈线性相关。
即使光强度低得多，473纳米的DPSS激光在标本内实现的聚合水平与其他光固化装置相似。这种激光可作为复合树脂光固化的光源。
