Manipal College of Dental Sciences, Manipal 576 104, Karnataka, India.
J Endod. 2010 Aug;36(8):1385-8. doi: 10.1016/j.joen.2010.04.002. Epub 2010 Jun 14.
The aim of this in vitro study was to evaluate the effect of 7% maleic acid and 17% EDTA solutions on the microhardness and the surface roughness of human root canal dentin.
Forty-five extracted human maxillary central incisors were sectioned longitudinally into a total of 90 segments, were embedded in auto polymerizing acrylic resin, and were grounded flat with silicon carbide abrasive papers. Based on the test solutions used, samples were divided randomly into three groups: (1) the EDTA group, 1 mL of 17% EDTA for 1 minute (n = 30), (2) the maleic acid group, 1 mL of 7% maleic acid for 1 minute (n = 30), and (3) the control group, 1 mL of 0.9% saline for 1 minute (n = 30). Every group was then divided into two subgroups of 15 specimens each. In group 1a, 2a, and 3a, specimens were used to determine the microhardness of the root canal dentine in the coronal, middle, and apical third using Vicker's hardness tester. In groups 1b, 2b, and 3b, specimens were used for the determination of surface roughness of the root canal dentine using a roughness tester (Surtronic, Leicester, England). The data were statistically analyzed using the Kruskall Wallis and Mann Whitney U tests.
There was no significant difference between EDTA and maleic acid in the reduction of microhardness. The increase in roughness was significantly greater with maleic acid when compared with EDTA.
Maleic acid reduced the microhardness of root dentin similar to EDTA but increased the surface roughness significantly more than EDTA.
本体外研究旨在评估 7%马来酸和 17% EDTA 溶液对人根管牙本质的显微硬度和表面粗糙度的影响。
45 颗上颌中切牙被纵向切割成总共 90 个段，然后嵌入自聚合丙烯酸树脂中，并使用碳化硅砂纸将其打磨平整。根据使用的测试溶液，样本被随机分为三组：（1）EDTA 组，使用 1 mL 17% EDTA 浸泡 1 分钟（n = 30）；（2）马来酸组，使用 1 mL 7%马来酸浸泡 1 分钟（n = 30）；（3）对照组，使用 1 mL 0.9%生理盐水浸泡 1 分钟（n = 30）。然后，每组又分为两个亚组，每组 15 个样本。在组 1a、2a 和 3a 中，使用维氏硬度计测量根管牙本质的冠、中、根尖三分之一的显微硬度。在组 1b、2b 和 3b 中，使用粗糙度测试仪（英国莱斯特的 Surtronic）测量根管牙本质的表面粗糙度。使用 Kruskal Wallis 和 Mann Whitney U 检验对数据进行统计分析。
EDTA 和马来酸在降低显微硬度方面没有显著差异。与 EDTA 相比，马来酸显著增加了粗糙度。
马来酸降低根管牙本质的显微硬度与 EDTA 相似，但增加表面粗糙度的效果明显大于 EDTA。
