Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran.
J Endod. 2010 Oct;36(10):1679-82. doi: 10.1016/j.joen.2010.06.010.
The purpose of this study was to evaluate the effect of calcium hydroxide premedication on the marginal adaptation of the mineral trioxide aggregate (MTA) apical barrier.
Forty single-rooted teeth were prepared and apically resorbed using sulfuric acid for 4 days. Teeth were allocated into two groups according to whether calcium hydroxide was placed in the canals for 1 week (medicated group) or not (nonmedicated group) before placing a 4-mm MTA apical plug in the canals. The roots were mounted on aluminum stubs, the root apex was viewed from the top under scanning electron microscopy, and the maximum distance between MTA and the surrounding dentin was measured.
The mean gap widths in the medicated and nonmedicated groups were 70.2 μm and 130.0 μm, respectively (p < 0.05).
Calcium hydroxide treatment improves marginal adaptation of the MTA apical plug.
本研究旨在评估氢氧化钙预处理对矿物三氧化物聚合体（MTA）根尖屏障边缘适应性的影响。
将 40 颗单根牙用硫酸进行 4 天的根尖吸收处理。根据在将 4mm 的 MTA 根尖塞放入根管之前是否在根管中放置氢氧化钙 1 周（用药组）或不放置（非用药组），将牙齿分为两组。将根固定在铝块上，从顶部在扫描电子显微镜下观察根尖，测量 MTA 与周围牙本质之间的最大距离。
用药组和非用药组的平均间隙宽度分别为 70.2μm 和 130.0μm（p<0.05）。
氢氧化钙处理可改善 MTA 根尖塞的边缘适应性。
