Williamson Anne E, Sandor Allan J, Justman Bruce C
Department of Endodontics, University of Iowa College of Dentistry, Iowa City, Iowa 52242, USA.
J Endod. 2009 Jan;35(1):107-9. doi: 10.1016/j.joen.2008.09.022. Epub 2008 Nov 4.
Canal preparation is a major step in root canal treatment and is directly related to subsequent disinfection and obturation. In recent years, nickel-titanium rotary systems such as the EndoSequence (Brassler USA, Savannah, GA), the ProTaper Universal (Dentsply/Maillefer, Ballagigues, Switzerland), and the ProFile GT (Dentsply/Maillefer, Ballagigues, Switzerland) have significantly altered root canal instrumentation. EndoSequence has become a very popular system among general practitioners but has not been scientifically tested or compared with other rotary systems that are commonly used by both specialists and general practitioners. The purpose of this study was to compare cleaning effectiveness under scanning electron microscopy (SEM) using three different rotary nickel-titanium instruments: the ProTaper variable taper, the ProFile GT .04 taper, and the EndoSequence .04 taper. Thirty-six extracted mandibular molars were selected for this study. The teeth were randomly divided into three groups. Each group had two noninstrumented teeth that served as controls. All teeth were prepared to a #40 final apical file after manufacturers' instructions. All three systems were used in the traditional "crown-down technique." Teeth were sectioned buccolingually and examined under SEM at 20.0 kV and 500x magnification in the middle third of the canal. Debris was defined as dentin chips, pulp remnants, and particles loosely attached to the root canal wall. Analysis of the SEM images was performed by using a five-score index. Results indicated that there was no difference in cleansing ability of the three file types.
根管预备是根管治疗中的一个主要步骤，并且与后续的消毒和充填直接相关。近年来，诸如EndoSequence（美国Brassler公司，佐治亚州萨凡纳）、ProTaper Universal（登士柏/迈耶费尔公司，瑞士巴拉吉格）和ProFile GT（登士柏/迈耶费尔公司，瑞士巴拉吉格）等镍钛旋转系统显著改变了根管器械操作。EndoSequence已成为全科医生中非常流行的一种系统，但尚未经过科学测试，也未与专科医生和全科医生常用的其他旋转系统进行比较。本研究的目的是使用三种不同的镍钛旋转器械——ProTaper可变锥度器械、ProFile GT.04锥度器械和EndoSequence.04锥度器械，在扫描电子显微镜（SEM）下比较清洁效果。本研究选取了36颗拔除的下颌磨牙。这些牙齿被随机分为三组。每组有两颗未进行器械操作的牙齿作为对照。所有牙齿均按照制造商的说明预备至#40号最终根尖锉。所有三种系统均采用传统的“冠向下技术”使用。将牙齿从颊舌向切开，并在根管中三分之一处以20.0 kV和500倍放大倍数在SEM下进行检查。碎屑定义为牙本质碎屑、牙髓残余物以及松散附着于根管壁的颗粒。通过使用五分制指数对SEM图像进行分析。结果表明，三种锉型的清洁能力没有差异。
