Jimna M M, Ashwini T S, Sowmya H K
Department of Conservative Dentistry and Endodontics, JSS Dental College and Hospital, JSS University, Mysore, Karnataka, India.
J Conserv Dent. 2017 Nov-Dec;20(6):451-458. doi: 10.4103/JCD.JCD_374_16.
To compare and evaluate the cleaning ability of two reciprocating systems, that is, WaveOne (WO) and self-adjusting files (SAF) in terms of removal of smear layer using sodium hypochlorite (NaOCl) and chlorhexidine gluconate (CHX) at apical one-third of the root canal.
Forty-three human maxillary anterior teeth were selected. The canal was instrumented manually up to a number 25 K-file size. WO and SAF were used to prepare the root canals. The following groups were studied: Group 1 using WO:-Group 1a = 5% NaOCl + 17% ethylenediaminetetraacetic acid (EDTA), Group 1b = 2% CHX + 17% EDTA, Group 2 using SAF:-Group 2a = 5% NaOCl + 17% EDTA, Group 2b = 2% CHX + 17% EDTA. All roots were split longitudinally and subjected to scanning electron microscopic. The presence of smear layer apical thirds was evaluated using a 5-score evaluation system. Chi-square tests were used for statistical analysis.
The results showed no significant difference in smear layer removal among both reciprocating system and among the irrigants. Group 2a exhibited the best results and was close to significant difference in score ( > 0.05). The NaOCl + EDTA solution used in Group 1a and Group 2a could effectively remove the smear layer in most of the specimens. However, SAF was more effective than WO in the apical third of the canal.
The results obtained from the present study suggest that using the SAF system and continuous irrigation action with NaOCl and EDTA solution could overcome the difficulty of removing smear layer even in hard-to-reach regions of the root canal.
比较和评估两种往复式系统，即WaveOne（WO）和自调式锉（SAF）在使用次氯酸钠（NaOCl）和葡萄糖酸氯己定（CHX）去除根管根尖三分之一处玷污层方面的清洁能力。
选取43颗人上颌前牙。根管手动预备至25号K锉大小。使用WO和SAF预备根管。研究以下几组：第1组使用WO：-第1a组=5% NaOCl + 17%乙二胺四乙酸（EDTA），第1b组=2% CHX + 17% EDTA；第2组使用SAF：-第2a组=5% NaOCl + 17% EDTA，第2b组=2% CHX + 17% EDTA。所有牙根纵劈后进行扫描电子显微镜检查。使用五分制评估系统评估根尖三分之一处玷污层的存在情况。采用卡方检验进行统计分析。
结果显示，两种往复式系统以及冲洗剂之间在玷污层去除方面无显著差异。第2a组表现出最佳结果，且得分接近显著差异（>0.05）。第1a组和第2a组使用的NaOCl + EDTA溶液能有效去除大多数标本中的玷污层。然而，在根管根尖三分之一处，SAF比WO更有效。
本研究结果表明，使用SAF系统并结合NaOCl和EDTA溶液持续冲洗，即使在根管难以到达的区域也能克服去除玷污层的困难。
