Lui Jeen-Nee, Kuah Hong-Guan, Chen Nah-Nah
Department of Restorative Dentistry, National Dental Centre, 5 Second Hospital Avenue, Singapore 168938, Republic of Singapore.
J Endod. 2007 Apr;33(4):472-5. doi: 10.1016/j.joen.2006.12.007. Epub 2007 Feb 20.
This study compared the in vitro efficacy of Smear Clear (Sybron Endo, CA), a 17% ethylenediaminetetraacetic acid (EDTA) solution with surfactants, to 17% EDTA, with and without the use of ultrasonics, in removal of the smear layer. Seventy-five extracted teeth, randomly distributed into 5 test groups, were prepared by using ProFile rotary instruments (Dentsply Maillefer, Ballaigues, Switzerland) and subjected to different final irrigating regimes; group A, 1% sodium hypochlorite; group B, 17% EDTA; group C, 17% EDTA with ultrasonics; group D, Smear Clear; and group E, Smear Clear with ultrasonics. Samples were examined under the scanning electron microscope and scored for debris and smear layer removal. Statistical analysis showed that groups D and E did not perform significantly better than groups B and C. Group C performed significantly better than group B. Addition of surfactants to EDTA in Smear Clear did not result in better smear layer removal. The use of ultrasonics with 17% EDTA improved smear layer removal.
本研究比较了含有表面活性剂的17%乙二胺四乙酸（EDTA）溶液Smear Clear（Sybron Endo，加利福尼亚州）与17% EDTA在有无超声辅助的情况下，去除玷污层的体外效果。使用Profile旋转器械（登士柏美福，瑞士巴拉格）制备75颗拔除的牙齿，并随机分为5个试验组，分别采用不同的最终冲洗方案；A组，1%次氯酸钠；B组，17% EDTA；C组，17% EDTA并使用超声；D组，Smear Clear；E组，Smear Clear并使用超声。在扫描电子显微镜下检查样本，并对碎屑和玷污层的去除情况进行评分。统计分析表明，D组和E组的表现并不显著优于B组和C组。C组的表现显著优于B组。Smear Clear中向EDTA添加表面活性剂并不能更好地去除玷污层。17% EDTA使用超声可改善玷污层的去除效果。
