Marques Ana Cl, Aguiar Bernardo A, Frota Luciana Ma, Guimarães Bruno M, Vivacqua-Gomes Nilton, Vivan Rodrigo R, Duarte Marco Ah, de Vasconcelos Bruno C
Private Practice, Fortaleza, Ceará, Brazil.
Post-Graduate Program in Dentistry, School of Pharmacy Dentistry and Nursing, Federal University of Ceará, Fortaleza Ceará, Brazil.
J Contemp Dent Pract. 2018 Sep 1;19(9):1087-1094.
The purpose of this study was to evaluate the influence of widening the apical root canal preparation (RCP) on the efficiency of different ethylenediaminetetraacetic acid (EDTA) agitation protocols on smear layer removal: EDTA; EDTA + Easy Clean in rotary movement (ECROT); EDTA + Easy Clean in reciprocating movement (ECREC); and EDTA + Passive ultrasonic irrigation (PUI).
A total of 80 mandibular premolars had their crowns sectioned and then were divided into two groups according to widening: size 25 or 40, 0.08 taper. Sequentially they were once again allocated to subgroups according to the agitation protocol performing eight experimental groups (n = 10). Ten additional teeth were prepared for controls (C+/C-). The specimens were then submitted to the cleaning protocols and thereafter cleaved and microphotographed by variable pressure scanning electron microscopy (SEM) at previously determined points along their root thirds (750*). Scores were attributed to the images, and data were analyzed by the Kruskal-Wallis, Student-Newman-Keuls and Friedman tests.
A higher widening was observed to have a positive influence on cleaning efficiency offering significant differences in global and apical third evaluations (p < 0.05). Relative to the agitation, significant differences were observed mainly in the apical third, with PUI and ECROT providing the best results (p < 0.05); no difference for C+ was observed when higher widening was employed.
A greater widening of the apical third provided a significant improvement in the action of the agitation/activation protocols. Moreover, the PUI and ECROT activation methods were shown to be superior to the use of EDTA solely, particularly in the apical third.
The findings of this study reinforce the need for clinical use of additional methods to complement cleaning. Therefore, it is important for professionals to have knowledge and command of these protocols to obtain more satisfactory results.
本研究旨在评估扩大根尖根管预备（RCP）对不同乙二胺四乙酸（EDTA）搅拌方案去除玷污层效率的影响：EDTA；旋转运动中的EDTA + 易清洁（ECROT）；往复运动中的EDTA + 易清洁（ECREC）；以及EDTA + 被动超声冲洗（PUI）。
总共80颗下颌前磨牙截冠后，根据扩大程度分为两组：25号或40号，锥度0.08。然后根据搅拌方案再次将它们分配到亚组，形成八个实验组（n = 10）。另外准备10颗牙齿作为对照（C + / C -）。标本随后接受清洁方案处理，之后沿牙根三分之一处预先确定的点劈开并通过可变压力扫描电子显微镜（SEM）进行显微拍照（750*）。对图像进行评分，并通过Kruskal-Wallis、Student-Newman-Keuls和Friedman检验分析数据。
观察到更大程度的扩大对清洁效率有积极影响，在整体和根尖三分之一评估中存在显著差异（p < 0.05）。相对于搅拌，主要在根尖三分之一处观察到显著差异，PUI和ECROT提供了最佳结果（p < 0.05）；采用更大程度的扩大时，C +组未观察到差异。
根尖三分之一更大程度的扩大显著改善了搅拌/激活方案的作用。此外，PUI和ECROT激活方法被证明优于单独使用EDTA，特别是在根尖三分之一处。
本研究结果强化了临床使用额外方法辅助清洁的必要性。因此，专业人员了解并掌握这些方案以获得更满意的结果非常重要。
