Chauhan Raju, Tikku Ap, Chandra Anil
Department of Conservative Dentistry and Endodontics, Institute of Dental Sciences, Pilibhit Bypass Road, Bareilly, India.
J Conserv Dent. 2012 Jul;15(3):218-22. doi: 10.4103/0972-0707.97940.
The study was designed to compare the efficiency of three different methods used for retreatment using a dental operating microscope (DOM) and a stereomicroscope and to evaluate and compare the two methods for detection of residual obturation material after retreatment.
The DOM can play an important role in the successful retreatment by detecting the remaining obturation material.
Thirty extracted maxillary central incisors were collected and obturated after biomechanical preparation. The samples were divided into three groups depending on the method of retreatment: Group I, H-files; Group II, ProTaper Universal retreatment files; and Group III: H-files + Gates-Glidden drills, with 10 samples in each group. After retreatment, the samples were observed under a DOM for detection of residual obturation material. Later, the teeth were cleared and observed under a stereomicroscope for detecting the remaining filling material. The results were subjected to the Spearman's rank order test and other statistical analysis.
The maximum cleanliness of the root canal walls was seen in Group I while Group II showed the least. The difference between the mean scores obtained with a DOM and a stereomicroscope was statistically significant (P = 0.05).
None of the techniques could completely remove the obturation material. The root canal cleanliness is best achieved when retreatment is performed under a DOM.
本研究旨在比较使用牙科手术显微镜（DOM）和体视显微镜进行再治疗的三种不同方法的效率，并评估和比较再治疗后检测残留充填材料的两种方法。
DOM在成功再治疗中通过检测残留充填材料可发挥重要作用。
收集30颗拔除的上颌中切牙，经生物力学预备后进行充填。根据再治疗方法将样本分为三组：第一组，H锉；第二组，ProTaper Universal再治疗锉；第三组：H锉+Gates-Glidden钻，每组10个样本。再治疗后，在DOM下观察样本以检测残留充填材料。之后，将牙齿清理并在体视显微镜下观察以检测剩余充填材料。结果进行Spearman等级秩次检验及其他统计分析。
根管壁清洁度最高的是第一组，而第二组最低。使用DOM和体视显微镜获得的平均分数之间的差异具有统计学意义（P = 0.05）。
没有一种技术能完全去除充填材料。在DOM下进行再治疗时，根管清洁度最佳。
