Afreen Lubna, Chandra Ramesh, Jain Jyoti, Mehrotra Ankita
Department of Conservative Dentistry and Endodontics, Career Post Graduate Institute of Dental Sciences, Vibhuti Khand, Gomti Nagar, Lucknow, Uttar Pradesh, India.
Department of Dentistry, Ram Manohar lohia Institute of Medical Sciences, Vibhuti Khand, Gomti Nagar, Lucknow, Uttar Pradesh, India.
J Conserv Dent. 2021 Nov-Dec;24(6):616-621. doi: 10.4103/jcd.jcd_92_21. Epub 2022 Apr 1.
The aim of this study is to evaluate the smear layer removal efficacy of newer rotary files using scanning electron microscopic analysis at the coronal, middle, and apical third of the root canal.
In this study, sixty permanent human single-rooted teeth with complete, mature root apices without any anatomic variation having straight patent root canal extracted for periodontal cause were included. The samples were cleaned to remove debris, calculus and rinsed with sodium hypochlorite to remove organic tissue and then stored in distilled water. All the samples were decoronated with the help of carborundum disc at root length of 12 mm to obtain segments similar in length. After this, all the samples were randomly divided into four groups -Protaper universal, Protaper Gold, EDM, and Revo-S. After cleaning and shaping, samples in each group were finally flushed with normal saline. Samples were then dried. Grooves were made into the root in the buccal and lingual portion of the root using a diamond bur and the samples were split longitudinally into two halves using stainless steel chisel and mallet. Preparation for scanning electron microscope was done and phototmicrographs at ×3000 were taken.
Chi square test and Kruskal-Wallis test was used for statistical analysis. Result of this study showed that Revo -S was found to be best amongst the groups and EDM was the poorest.
Based on the present study, Revo-S files showed the best smear layer removal in the coronal, middle, and apical 1/3 of the root canal when compared to other groups. Within the parameters of the study, Revo -S was found to be best amongst the groups and EDM was the poorest. The quality of various files according to ranks of smear layer removal was found to be: Group IV > Group II > Group I > Group III.
本研究旨在通过扫描电子显微镜分析，评估新型旋转锉在根管冠部、中部和根尖三分之一处去除玷污层的效果。
本研究纳入了60颗因牙周原因拔除的完整、成熟根尖且无任何解剖变异的人恒牙单根牙，根管笔直且通畅。样本经清洁以去除碎屑、牙结石，并用次氯酸钠冲洗以去除有机组织，然后保存在蒸馏水中。借助碳化硅盘在牙根长度为12mm处去除所有样本的冠部，以获得长度相似的节段。此后，将所有样本随机分为四组——ProTaper Universal、ProTaper Gold、电火花加工（EDM）和Revo-S。清洁和预备成形后，每组样本最终用生理盐水冲洗。然后将样本干燥。使用金刚砂钻在牙根的颊侧和舌侧部分制作凹槽，并用不锈钢凿子和锤子将样本纵向劈成两半。进行扫描电子显微镜制备，并拍摄放大3000倍的显微照片。
采用卡方检验和克鲁斯卡尔-沃利斯检验进行统计分析。本研究结果表明，Revo-S在各组中表现最佳，而EDM最差。
基于本研究，与其他组相比，Revo-S锉在根管冠部、中部和根尖三分之一处显示出最佳的玷污层去除效果。在本研究参数范围内，Revo-S在各组中表现最佳，EDM最差。根据玷污层去除等级，各种锉的质量排序为：第四组>第二组>第一组>第三组。
