Deng Xiao-lin, Zhang Bao-wei, Lu Peng
Department of Prosthodontics, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China.
Shanghai Kou Qiang Yi Xue. 2011 Feb;20(1):31-5.
To investigate the effect of light-emitting diode (LED) light curing unit (LCU) and quartz-tungsten (QTH) LCU on the polymerization-shrinkage of different resin composites.
Three composites Z100, Z250, AP-X were irradiated by QTH LCU and LED LCU. Polymerization-shrinkage of 50s and 400s after the composites curing were measured by 3D-profile measuring apparatus by phase-shifted projected grating.The polymerization-shrinkage of LED and QTH curing composites were analysed by SPSS12.0 software package of one-way ANOVA.
At 50s curing and 400s curing period, the polymerization- shrinkage of Z100, Z250 resin was different by QTH LCU and LED LCU curing, the polymerization-shrinkage by LED LCU curing was less than that by QTH LCU (P < 0.05); the polymerization-shrinkage of AP-X was not statistically different by QTH LCU and LED LCU curing (P > 0.05). CONCLUSUINS: The polymerization-shrinkage of Z100,Z250 resin is statistically less cured by LED LCU than QTH; the polymerization-shrinkage of AP-X resin is not statistically different cured by QTH LCU and LED LCU. Supported by Research Fund of Science and Technology Commission of Shanghai Municipality (08DZ2271100).
研究发光二极管（LED）光固化机和石英钨卤（QTH）光固化机对不同树脂复合材料聚合收缩率的影响。
采用QTH光固化机和LED光固化机对三种复合材料Z100、Z250、AP-X进行照射。通过相移投影光栅三维轮廓测量仪测量复合材料固化后50秒和400秒时的聚合收缩率。采用SPSS12.0软件包对LED和QTH固化复合材料的聚合收缩率进行单因素方差分析。
在50秒固化期和400秒固化期，QTH光固化机和LED光固化机固化Z100、Z250树脂的聚合收缩率不同，LED光固化机固化的聚合收缩率小于QTH光固化机（P<0.05）；QTH光固化机和LED光固化机固化AP-X的聚合收缩率无统计学差异（P>0.05）。结论：LED光固化机固化Z100、Z250树脂的聚合收缩率在统计学上低于QTH光固化机；QTH光固化机和LED光固化机固化AP-X树脂的聚合收缩率无统计学差异。本研究受上海市科学技术委员会科研基金资助（08DZ2271100）。
