Khademi Abbasali, Yazdizadeh Mohammad, Feizianfard Mahboobe
Department of Endodontics, School of Dentistry, Isfahan Medical University, Iran.
J Endod. 2006 May;32(5):417-20. doi: 10.1016/j.joen.2005.11.008. Epub 2006 Feb 7.
The purpose of this study was to determine the minimum instrumentation size required for the effective penetration of irrigants and elimination of debris and smear layer from the apical third of the root canals. The mesiobuccal canals of 40 freshly extracted human mandibular first molar teeth were instrumented using the crown-down technique. The teeth were divided into four test groups according to the size of their Master Apical File (#20, #25, #30, #35), and two control groups. After final irrigation, the removal of debris and smear layer from the apical third of root canals was determined under a scanning electron microscope. The data was analyzed using Kruskal-Wallis and Mann-Whitney tests. Based on the results, it appears that the minimum instrumentation size needed for penetration of irrigants to the apical third of the root canal is a #30 file.
本研究的目的是确定有效渗透冲洗剂并清除根管根尖三分之一处的碎屑和玷污层所需的最小器械尺寸。使用冠向下技术对40颗新鲜拔除的人类下颌第一磨牙的近中颊根管进行预备。根据主尖锉的尺寸（#20、#25、#30、#35）将牙齿分为四个试验组和两个对照组。最终冲洗后，在扫描电子显微镜下确定根管根尖三分之一处碎屑和玷污层的清除情况。使用Kruskal-Wallis和Mann-Whitney检验对数据进行分析。根据结果，似乎冲洗剂渗透到根管根尖三分之一处所需的最小器械尺寸是#30锉。
