Yeter K Y, Gunes B, Danaci Z
Department of Endodontics, Faculty of Dentistry, Eskişehir Osmangazi University, Turkey.
Niger J Clin Pract. 2021 Sep;24(9):1289-1293. doi: 10.4103/njcp.njcp_650_20.
The aim of this study was to evaluate the effect of passive ultrasonic activation on calcium hydroxide removal from simulated internal root resorption (IRR) cavities at different root levels.
Sixty mandibular canines were prepared and divided into 3 groups to create IRR cavities at apical, middle, coronal root levels. The cavities filled with calcium hydroxide (CH). Specimens were divided into two subgroups according to the technique used for CH removal: Passive ultrasonic activation (PUA), Classic syringe irrigation (CSI). The cavities were photographed with a stereomicroscope, and percentage of remaining CH was measured using digital image analysis software (Image J). Statistical analysis was performed with two-way ANOVA and post-hoc Duncan tests.
PUA removed significantly more CH at apical and middle levels. (p < 0.05) There was no significant difference between PUA and CSI at coronal level. (p > 0.05) In PUA group, the amount of residual CH was the highest at coronal level. (p < 0.05) In CSI group, the amount of residual CH was the highest at apical level. (p < 0.05).
None of the tested technique was able to completely remove CH from the simulated IRR cavities. CH was removed better with PUA than CSI at middle and apical root levels. For both techniques, the best results were obtained at middle root level.
本研究旨在评估被动超声激活对不同牙根水平模拟内吸收（IRR）腔中氢氧化钙去除效果的影响。
制备60颗下颌尖牙，分为3组，分别在根尖、根中、冠根水平制备IRR腔。腔内填充氢氧化钙（CH）。根据用于去除CH的技术，将标本分为两个亚组：被动超声激活（PUA）、传统注射器冲洗（CSI）。用体视显微镜拍摄腔室照片，并使用数字图像分析软件（Image J）测量剩余CH的百分比。采用双向方差分析和事后邓肯检验进行统计分析。
PUA在根尖和根中水平去除的CH明显更多。（p < 0.05）在冠根水平，PUA和CSI之间无显著差异。（p > 0.05）在PUA组中，冠根水平的残留CH量最高。（p < 0.05）在CSI组中，根尖水平的残留CH量最高。（p < 0.05）。
所测试的技术均不能完全从模拟IRR腔中去除CH。在根中及根尖水平，PUA去除CH的效果优于CSI。对于两种技术，在根中水平获得的效果最佳。
