Crumpton Brent J, Goodell Gary G, McClanahan Scott B
Endodontics Department, Naval Postgraduate Dental School, Bethesda, MD, USA.
J Endod. 2005 Jul;31(7):536-8. doi: 10.1097/01.don.0000148871.72896.1d.
The purpose of this study was to quantify the volume of 17% ethylene diamine tetra-acetic acid (EDTA) needed to efficiently remove the smear layer after rotary instrumentation, and to determine if additional irrigation has any effect on debris removal. Forty single canal teeth were instrumented with ProFile GT rotary instruments. Experimental groups were irrigated with 1, 3, or 10 ml of 17% EDTA for 1 min, followed by a final rinse with 3 ml of 5.25% sodium hypochlorite (NaOCl). Samples were scored for debris remaining and examined under SEM to determine quality of smear layer removal. There were no significant differences among groups when comparing either debris remaining or quality of smear layer removal. EDTA irrigation volume greater than 1 ml did not improve debris removal. Efficient removal of the smear layer was accomplished with a final rinse of 1 ml of 17% EDTA for 1 min, followed by 3 ml of 5.25% NaOCl.
本研究的目的是量化在旋转器械预备后有效去除玷污层所需的17%乙二胺四乙酸（EDTA）的量，并确定额外冲洗是否对碎屑清除有任何影响。40颗单根管牙齿用ProFile GT旋转器械进行预备。实验组分别用1、3或10毫升17%的EDTA冲洗1分钟，然后用3毫升5.25%的次氯酸钠（NaOCl）进行最终冲洗。对样本残留碎屑进行评分，并在扫描电子显微镜下检查以确定玷污层去除的质量。在比较残留碎屑或玷污层去除质量时，各组之间没有显著差异。大于1毫升的EDTA冲洗量并不能改善碎屑清除。通过用1毫升17%的EDTA冲洗1分钟，然后用3毫升5.25%的NaOCl进行最终冲洗，可有效去除玷污层。
