Jadhav Ganesh Ranganath, Mittal Priya, Kulkarni Anish, Syed Shibli, Bagul Ravikiran, Elahi Saina, Kalra Dheeraj
Department of Conservative Dentistry and Endodontics, Sinhgad Dental College and Hospital, Pune, Maharashtra, India.
Department of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, New Delhi, India.
Dent Res J (Isfahan). 2016 Nov-Dec;13(6):508-514. doi: 10.4103/1735-3327.197031.
The purpose of this study was to evaluate the canal cleaning ability of three novel endodontic rotary instruments and compare with ProTaper files as a control in apical third of root canals under scanning electron microscopy (SEM).
Eighty freshly extracted mandibular premolars were selected according to inclusion criteria. Buccal cusp tips were ground to ensure having a flat coronal reference point with a total tooth length of 16 mm for all samples. Teeth were divided equally into four groups: Group I (ProTaper group), Group II (ProTaper next group), Group III (variable taper group), and Group IV (self-adjusting file [SAF] group). Using SEM, the dentinal surfaces were observed and rated at apical thirds with a magnification of ×1000 for the presence/absence of smear layer and debris. Descriptive analysis was performed, and analysis of variance with Bonferroni test was carried out for comparison between the groups, at a significance level of 0.05.
There was statistically significant difference between Group II and Group IV for debris ( = 0.047) and smear layer ( = 0.037).
In apical third of root canal, SAF showed statistically significant canal cleaning ability due to combined effect of continuous streaming irrigation with effectively replacing the irrigant from the apical portion of the root canal, irrigants activation through the creation of turbulence, and its self-adapting design to root canal anatomy with a scrubbing motion on the canal walls.
本研究的目的是评估三种新型根管旋转器械的根管清理能力，并在扫描电子显微镜（SEM）下与作为对照的ProTaper锉在根管根尖三分之一处进行比较。
根据纳入标准选择80颗新鲜拔除的下颌前磨牙。磨除颊尖以确保所有样本有一个平坦的冠方参考点，总牙长为16mm。牙齿平均分为四组：第一组（ProTaper组）、第二组（ProTaper Next组）、第三组（可变锥度组）和第四组（自调式锉[SAF]组）。使用SEM，以×1000的放大倍数观察牙本质表面，并对根尖三分之一处有无玷污层和碎屑进行评级。进行描述性分析，并采用方差分析和Bonferroni检验对各组之间进行比较，显著性水平为0.05。
第二组和第四组在碎屑（P = 0.047）和玷污层（P = 0.037）方面存在统计学显著差异。
在根管根尖三分之一处，由于持续冲洗与从根管根尖部有效替换冲洗液的联合作用、通过产生湍流激活冲洗液以及其对根管解剖结构的自适应设计并在根管壁上产生擦洗运动，SAF显示出统计学显著的根管清理能力。
