Kamalasanan Rejitha R, Devarasanahalli Swapna V, Aswathanarayana Ranjini M, Rashmi K, Gowda Yashwanth, Nadig Roopa R
Post Graduate Student, Department of Conservative Dentistry and Endodontics, Dayananda Sagar, College of Dental Sciences/Rajiv Gandhi University of Health Sciences, Bengaluru, Karnataka, India.
Reader, Department of Conservative Dentistry and Endodontics, Dayananda Sagar College of Dental Sciences/Rajiv Gandhi University of Health Sciences, Bengaluru, Karnataka, India.
J Clin Diagn Res. 2017 May;11(5):ZC49-ZC53. doi: 10.7860/JCDR/2017/25519.9857. Epub 2017 May 1.
Chlorine dioxide (ClO) has been recently investigated as a possible root canal irrigant due to its broad spectrum of antimicrobial action, tissue dissolution and smear layer removal properties. Literature is scarce on the effect of chlorine dioxide irrigation on the resin sealer dentin bond strength.
To compare 5% chlorine dioxide (ClO) with or without Ethylene Diamine Tetra Acetic acid (EDTA) with 3% Sodium hypochlorite (NaOCl) and EDTA combination as endodontic irrigants on the adhesion of AH Plus sealer to radicular dentin using micro- Push out Bond Strength (µPBS) test.
Forty freshly extracted central incisors were decoronated and randomly divided into four groups based on the different irrigation regimes followed during irrigation: Group I - 3% NaOCl + 17% EDTA, Group II - 5% ClO + 17% EDTA, Group III - 5% ClO and Group IV - Saline, and canal enlarged till Protaper F3. All the samples were obturated with F3 gutta-percha cones using AH Plus sealer and sectioned perpendicular to long axis to obtain 1mm thick slices from the middle and coronal portions for µPBS measurement in universal testing machine followed by assessment of failure pattern under stereomicroscope. Data was analysed using One-way analysis of variance (ANOVA), Bonferroni and t-test.
Bond strength values were in the following order: Group I>Group II>Group III>Group IV, with no statistically significant difference amongst experimental groups on intergroup comparison, except with saline. The µPBS values were more in coronal third than middle third in all specimens, with no statistical significant difference. Mode of failure showed mixed patterns in all experimental groups except saline.
In the present study, the bond strength values of ClO were comparable with conventional NaOCl and EDTA combination and hence, ClO can be considered as an effective alternative endodontic irrigant.
二氧化氯（ClO）由于其广泛的抗菌作用、组织溶解和去除玷污层的特性，最近被作为一种可能的根管冲洗剂进行研究。关于二氧化氯冲洗对树脂封闭剂与牙本质粘结强度影响的文献较少。
使用微推出粘结强度（µPBS）测试，比较含或不含乙二胺四乙酸（EDTA）的5%二氧化氯（ClO）与3%次氯酸钠（NaOCl）和EDTA联合作为根管冲洗剂时，AH Plus封闭剂与牙根牙本质的粘结情况。
40颗新鲜拔除的上颌中切牙去冠，根据冲洗过程中采用的不同冲洗方案随机分为四组：第一组 - 3% NaOCl + 17% EDTA，第二组 - 5% ClO + 17% EDTA，第三组 - 5% ClO，第四组 - 生理盐水，根管扩大至Protaper F3。所有样本使用AH Plus封闭剂用F3牙胶尖充填，垂直于长轴切片，从中间和冠部获取1mm厚的切片，在万能试验机上进行µPBS测量，随后在体视显微镜下评估失败模式。数据采用单因素方差分析（ANOVA）、Bonferroni检验和t检验进行分析。
粘结强度值顺序如下：第一组>第二组>第三组>第四组，除与生理盐水组比较外，各实验组组间比较无统计学显著差异。所有样本中，冠三分之一处的µPBS值高于中三分之一处，无统计学显著差异。除生理盐水组外，所有实验组的失败模式均为混合模式。
在本研究中，ClO的粘结强度值与传统的NaOCl和EDTA联合相当，因此，ClO可被视为一种有效的替代根管冲洗剂。
