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Effectiveness of irrigation strategies on the removal of the smear layer from root canal dentin

机译:灌溉策略对根管牙本肽去除涂抹层的有效性

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The aim of this study was to evaluate the removal of the smear layer by some commonly used (needle-and-syringe irrigation, sonic activation, ultrasonically activated irrigation) and new root canal irrigation strategies (negative pressure irrigation and polymer rotary file) using a novel approach by comparing pre- and post-experimental images. Prepared root canals (n=50) were subjected to a split tooth model and divided into 5 groups (n=10): (1) needle-and-syringe irrigation (control); (2) sonic activation (SA); (3) negative pressure irrigation with continuous warm activated irrigation and evacuation (CWA); (4) polymer finishing file (FF); (5) ultrasonically activated irrigation (UAI). Smear layer scores and percentage of open dentinal tubules (%ODT) were evaluated by 2 examiners before and after irrigation procedures, from the middle and apical thirds of the root canal, on scanning electron microscopic images. Data were analysed using Kruskal-Wallis and post hoc tests at P=0.05. Needle-and-syringe irrigation (control) showed no significant difference (both smear score and %ODT) compared to the pre-experimental value (P>0.05). All other groups showed lower smear scores and higher %ODT, compared to the control (P<0.05). The lowest smear score and highest %ODT were observed in the CWA group, which was significantly different from all other groups (P<0.05). SA group showed significantly higher smear scores and lower %ODT than FF or UAI (P<0.05). CWA showed superior removal of smear layer in the middle and apical thirds of the root canal compared to the other irrigation strategies.
机译:本研究的目的是通过一些常用的(针和注射器灌溉,声波激活,超声波激活的灌溉)和新的根管灌溉策略(负压灌溉和聚合物旋转文件)来评估涂抹层的去除比较实验前和实验后图像的新方法。将制备的根管(n = 50)进行分裂牙齿模型,分为5组(n = 10):(1)针和注射器灌溉(对照); (2)声波激活(SA); (3)负压灌溉,连续热激活灌溉和疏散(CWA); (4)聚合物精加工文件(FF); (5)超声激活灌溉(UAI)。在灌溉手术前后,从根管的中间和顶端的扫描电子显微镜图像中,在灌溉手术前后评估涂抹层数和开放牙本质小管(百分比ODT)的涂抹层数和百分比。使用kruskal-wallis分析数据,并在p = 0.05时测试。与预实验值(P> 0.05)相比,针刺注射器灌溉(对照)显示出没有显着差异(涂片评分和含量差异和%ODT)。与对照相比,所有其他组均显示较低的涂片评分和更高的odt%(P <0.05)。在CWA组中观察到最低涂片评分和最高%的ODT,其与所有其他组显着不同(P <0.05)。 SA组显示出明显较高的涂片评分和比FF或Uai较低的含量较低(P <0.05)。与其他灌溉策略相比,CWA显示出根部管中的中间和顶端三分之一的涂片层的优越。

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