Endodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
J Endod. 2011 Sep;37(9):1272-5. doi: 10.1016/j.joen.2011.06.007. Epub 2011 Jul 16.
Different techniques and irrigant delivery devices have been proposed to increase the flow and distribution of irrigating solutions within the root canal system. The aim of this study was to compare smear layer removal after final irrigant activation with apical negative pressure (ANP), manual dynamic agitation (MDA), and passive ultrasonic irrigation (PUI).
Forty single-rooted human mandibular premolars were decoronated to a standardized length of 16 mm. They were cleaned and shaped by using ProTaper system to size F4 and NaOCl 2.5%. The specimens were divided into 4 equal groups (n = 10) according to the final irrigation activation technique: group 1, passive irrigation (PI); group 2, apical negative pressure (ANP) (EndoVac); group 3, manual dynamic activation (MDA); and group 4, passive ultrasonic irrigation (PUI). Samples were split longitudinally and examined under scanning electron microscope for smear layer presence.
PI and PUI had the highest smear scores, with no significant differences between them. This was followed by MDA and finally ANP, which showed the statistically significant lowest mean score at P ≤ .05.
Final irrigant activation with ANP and MDA resulted in better removal of the smear layer than with PUI or PI.
为了增加根管系统内冲洗液的流动和分布，已经提出了不同的技术和冲洗液输送装置。本研究旨在比较根尖负压（ANP）、手动动力搅拌（MDA）和被动超声冲洗（PUI）对最终冲洗激活后清除玷污层的效果。
将 40 颗下颌前磨牙按 16mm 的标准长度去冠，用 ProTaper 系统清理和成型至 F4 和 2.5%次氯酸钠。根据最终冲洗激活技术将标本分为 4 组（每组 10 个）：组 1，被动冲洗（PI）；组 2，根尖负压（EndoVac）（ANP）；组 3，手动动力激活（MDA）；组 4，被动超声冲洗（PUI）。样本沿纵轴劈开，在扫描电子显微镜下观察玷污层的存在情况。
PI 和 PUI 的玷污层评分最高，两者之间无显著差异。MDA 次之，而 ANP 的平均评分最低，差异有统计学意义（P≤0.05）。
与 PUI 或 PI 相比，ANP 和 MDA 用于最终冲洗激活时，能更好地清除玷污层。
