Nordic Institute of Dental Materials, Sognsveien 70A, Oslo, Norway.
Dent Mater. 2013 Aug;29(8):824-34. doi: 10.1016/j.dental.2013.04.022. Epub 2013 Jun 10.
The latest LED dental curing devices claim sufficient curing of restorative materials with short curing times. This study evaluates mechanical and chemical properties as a function of curing time of two commercial composite filling materials cured with three different LED lamps.
The composites were Filtek Z250 (3M ESPE) and Tetric EvoCeram (Ivoclar Vivadent) and the LED curing devices were bluephase 16i (Ivoclar Vivadent), L.E.Demetron II (Kerr) and Mini L.E.D. (Satelec). Control samples were cured with a QTH-lamp (VCL 400, Kerr). The wear resistance after simulated tooth brushing, degree of conversion, curing depth, and amounts of residual monomers were measured after different curing times.
The results of this study show that short curing time with high-intensity LEDs may influence the bulk properties of the materials, resulting in lower curing depth and increased residual monomer content. The measured surface properties of the materials, degree of conversion and wear resistance, were not affected by short curing times to the same extent.
This study demonstrates that reduced exposure time with high intensity LEDs can result in composite restorations with inferior curing depth and increased leaching of monomers. Dentists are recommended to use sufficient curing times even with high intensity LEDs to ensure adequate curing and minimize the risk of monomer leaching.
最新的 LED 牙科固化设备声称可以在短时间内充分固化修复材料。本研究评估了两种商业复合填充材料在三种不同 LED 灯照射下的固化时间与机械和化学性能的关系。
复合材料为 Filtek Z250（3M ESPE）和 Tetric EvoCeram（义获嘉），LED 固化设备为 bluephase 16i（义获嘉）、L.E.Demetron II（ Kerr）和 Mini L.E.D.（ Satelec）。对照组用 QTH 灯（ Kerr 公司的 VCL 400）固化。模拟刷牙后测量耐磨性、转化率、固化深度和残留单体量，然后记录不同固化时间的结果。
本研究结果表明，高强度 LED 的短固化时间可能会影响材料的整体性能，导致固化深度降低和残留单体含量增加。材料的表面性能、转化率和耐磨性测量值受短固化时间的影响程度不同。
本研究表明，高强度 LED 的曝光时间缩短可能导致复合修复体的固化深度降低，单体溶出增加。建议牙医即使使用高强度 LED 灯，也要使用足够的固化时间，以确保充分固化，最大程度地降低单体溶出的风险。
