Tak Onjen, Altintas Subutay Han, Ozturk Nilgun, Usumez Aslihan
Department of Prosthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey.
Clin Oral Investig. 2009 Mar;13(1):29-35. doi: 10.1007/s00784-008-0221-9. Epub 2008 Sep 4.
The purpose of this study was to determine colour changes in a composite cured with tungsten-halogen, light-emitting diode (LED) or a plasma arc after 5 years. Five specimens 10 mm in diameter and 2 mm in height were prepared using Hybrid (Clearfil AP-X) composite for each test group. The corresponding specimens were cured with a tungsten-halogen curing light, a LED unit or with a plasma arc. Specimens were stored in light-proof boxes for 5 years after the curing procedure to avoid further exposure to light and stored in 37 degrees C in 100% humidity. Colorimetric values of the specimens immediately after curing and after 5 years were measured using colorimeter. The DeltaE*( ab ) values varied significantly depending on the curing unit used (p < 0.001). Curing time did not affect the colour changes of the specimens (p = 0.4). The results of this study suggest that composite materials undergo measurable changes due to the curing unit exposure.
本研究的目的是确定在经过5年后，使用钨卤素灯、发光二极管（LED）或等离子弧固化的复合材料的颜色变化。每个测试组使用混合（Clearfil AP-X）复合材料制备5个直径10毫米、高2毫米的试样。相应的试样分别用钨卤素固化灯、LED装置或等离子弧进行固化。固化程序完成后，将试样存放在遮光箱中5年，以避免进一步暴露于光线下，并在37摄氏度、湿度100%的环境中储存。使用色度计测量试样固化后立即以及5年后的比色值。ΔE*（ab）值根据所使用的固化装置不同而有显著差异（p < 0.001）。固化时间对试样的颜色变化没有影响（p = 0.4）。本研究结果表明，由于固化装置的照射，复合材料会发生可测量的变化。
