目的:本研究旨在比较次氯酸钠(NaOCl)初始灌溉和QMix最终灌溉的有效性,40%柠檬酸,和17%乙二胺四乙酸(EDTA)的涂抹层去除和牙本质侵蚀。
方法:根据使用的最终冲洗剂的类型,将40颗提取的人类下颌前磨牙随机分为四组(n=10):17%EDTA,QMix,柠檬酸,和对照(生理盐水)。使用ProTaperNext仪器将运河机械地制备成X3的顶端尺寸。随后,根在颊舌方向被切开。扫描电子显微镜(SEM)用于评估涂抹层的存在和牙冠中牙本质侵蚀的量,中间,和根管的顶端三分之二。
结果:关于去除涂抹层,对照组与其他测试组之间存在显着差异。此外,冠状区和中部的三分之一明显高于根尖的三分之一。然而,EDTA组间没有显著差异,QMix,和柠檬酸。关于牙本质侵蚀,与其他测试组相比,柠檬酸产生的牙本质侵蚀明显更多。
结论:最终用溶液冲洗的冠状和中三分之二的涂抹层去除能力高于顶端三分之一。在所有测试的解决方案中,40%柠檬酸对牙本质侵蚀的影响最为明显,其次是17%EDTA和QMix。
OBJECTIVE: This study aimed to compare the effectiveness of initial irrigation with sodium hypochlorite (NaOCl) and final irrigation with QMix, 40% citric acid, and 17% ethylenediaminetetraacetic acid (EDTA) on smear layer removal and
dentin erosion.
METHODS: Forty extracted human mandibular premolar teeth were randomly divided into four groups (n = 10) according to the type of final irrigants used: 17% EDTA, QMix, citric acid, and control (normal saline). Canals were mechanically prepared using ProTaper Next instruments to an apical size of X3. Subsequently, the roots were sectioned in a buccolingual direction. Scanning electron microscopy (SEM) was used to assess the presence of the smear layer and the amount of
dentin erosion in the coronal, middle, and apical thirds of the root canals.
RESULTS: In regards to smear layer removal, there was a significant difference between the control group and the other tested groups. Moreover, it was significantly higher in the coronal and middle thirds than in the apical third. However, there were no significant differences between the groups of EDTA, QMix, and citric acid. Concerning
dentin erosion, citric acid produced significantly more
dentin erosion than the other tested groups.
CONCLUSIONS: Final irrigation with solutions had a higher ability to remove the smear layer in the coronal and middle thirds compared to the apical third. Of all the solutions tested, 40% citric acid had the most pronounced impact on
dentin erosion, followed by 17% EDTA and QMix.