Singla Ruchi, Jhamb Swaty, Kaur Amandeep, Vashisht Ruchi
Department of Conservative Dentistry and Endodontics, Dr. HSJ Institute of Dental Sciences and Hospital, Panjab University, Chandigarh, India.
J Conserv Dent. 2017 Nov-Dec;20(6):459-462. doi: 10.4103/JCD.JCD_215_17.
The purpose of this study was to compare the incidence of dentinal defects during root canal preparation with hand files using different irrigants.
A total of 120 extracted mandibular incisors were randomly divided into onecontrol group and five experimental groups ( = 20) depending on the irrigant used. Biomechanical preparation was not done in control group. Teeth in experimental groups were prepared with hand K-files to a master apical file #35 with 1-mm increments step-back up to #50. In Group 2, saline was used as an irrigant. In Groups 3, 4, 5, and 6, 3% sodium hypochlorite (NaOCL), SmearClear, 17% ethylenediaminetetraacetic acid (EDTA), and 2% chlorhexidine (CHX), respectively, were used as an irrigant. Specimens were sectioned perpendicular to the long axis at 3, 6, and 9 mm from the apex. Sections were observed under a digital stereomicroscope at 30× magnification. Two-tailed -test was used for statistical analysis.
There was a statistically significant difference between the six groups. Group 5 (17% EDTA) had the highest number of dentinal defects, followed by Group 3 (3% NaOCl), Group 4 (SmearClear), and Group 6 (2% CHX).
17% EDTA causes more dentinal defects as compared to 3% NaOCl, SmearClear, 2% CHX, and saline.
本研究的目的是比较使用不同冲洗剂的手动锉进行根管预备时牙本质缺陷的发生率。
根据所使用的冲洗剂，将总共120颗拔除的下颌切牙随机分为1个对照组和5个试验组（每组n = 20）。对照组未进行生物力学预备。试验组的牙齿用手动K锉预备至主尖锉#35，以1 mm的增量逐步后退至#50。第2组使用生理盐水作为冲洗剂。第3、4、5和6组分别使用3%次氯酸钠（NaOCl）、SmearClear、17%乙二胺四乙酸（EDTA）和2%氯己定（CHX）作为冲洗剂。标本在距根尖3、6和9 mm处垂直于长轴进行切片。切片在数码体视显微镜下以30倍放大倍数观察。采用双侧t检验进行统计分析。
六组之间存在统计学上的显著差异。第5组（17% EDTA）的牙本质缺陷数量最多，其次是第3组（3% NaOCl）、第4组（SmearClear）和第6组（2% CHX）。
与3% NaOCl、SmearClear、2% CHX和生理盐水相比，17% EDTA会导致更多的牙本质缺陷。
