Manipal College of Dental Sciences, Manipal, Manipal University, Karnataka, India.
Aust Dent J. 2012 Sep;57(3):344-8. doi: 10.1111/j.1834-7819.2012.01710.x. Epub 2012 Jul 6.
This study compared the efficacy of 10% citric acid, 17% EDTA and 7% maleic acid (MA) with ultrasonic agitation in the removal of calcium hydroxide (CH) from root canals.
Seventy maxillary anterior teeth were enlarged to F3 using protaper files. Teeth were then divided into two groups: A and B. Group A was filled with (CH + iodoform + silicone oil) mixture and group B with CH and propylene glycol (PG). Ten teeth were divided into positive and negative control groups. The volume of CH preparations was estimated using spiral CT. After seven days, teeth in groups A and B were further divided into three subgroups based on irrigants used and CH was retrieved along with ultrasonic agitation. Volume analysis was undertaken using spiral CT. Mean percentage of CH removed was analysed using one-way ANOVA followed by Tukey's Honestly Significant Difference test.
All irrigants removed (CH + PG) completely without any difference between them (p = 0.17). Removal of (CH + iodoform + silicone oil) was significantly higher for MA and citric acid than EDTA (p < 0.001). There was no difference between MA and citric acid.
Concentrations of 7% MA and 10% citric acid were found to be superior to 17% EDTA in the removal of (CH + iodoform + silicone oil). (CH + PG) preparation was completely removed by all the irrigants.
本研究比较了 10%柠檬酸、17%乙二胺四乙酸（EDTA）和 7%马来酸（MA）在超声搅拌下从根管中去除氢氧化钙（CH）的效果。
70 颗上颌前牙用 ProTaper 锉扩大到 F3。然后将牙齿分为两组：A 组和 B 组。A 组填充（CH+碘仿+硅油）混合物，B 组填充 CH 和丙二醇（PG）。10 颗牙齿分为阳性和阴性对照组。使用螺旋 CT 估计 CH 制剂的体积。七天后，根据冲洗剂的使用情况，将 A 组和 B 组进一步分为三个亚组，同时用超声搅拌回收 CH。使用螺旋 CT 进行体积分析。使用单向方差分析（ANOVA）和 Tukey Honestly Significant Difference 检验分析 CH 去除的平均百分比。
所有冲洗剂（CH+PG）都能完全去除，彼此之间没有差异（p=0.17）。与 EDTA 相比，MA 和柠檬酸对（CH+碘仿+硅油）的去除效果明显更高（p<0.001）。MA 和柠檬酸之间没有差异。
7%MA 和 10%柠檬酸的浓度在去除（CH+碘仿+硅油）方面优于 17%EDTA。所有冲洗剂都能完全去除（CH+PG）制剂。
