Ozdemir Hüseyin Ozgür, Ozçelik Bahar, Karabucak Bekir, Cehreli Zafer C
Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Dent Traumatol. 2008 Feb;24(1):70-3. doi: 10.1111/j.1600-9657.2006.00512.x.
The purpose of this study was to investigate the diffusion of calcium ions (Ca+2) through exposed dentinal tubules following intracanal application of mineral trioxide aggregate (MTA). Fifty-two single-rooted teeth were instrumented using 2.5% sodium hypochlorite for irrigation between each file size. Thereafter, standardized defects were created on the root surfaces so as to mimic external root resorption. The root canals and external defects received a final irrigation of 17% ethylenediaminetetraacetic acid and distilled water. MTA powder was then mixed with saline and placed into the canals. All root surfaces except the cavities were sealed with two coats of varnish. Teeth with unfilled canals (n = 26) served as controls. The teeth were immersed in saline after which the release of Ca+2 from the defects into the saline was measured at 1, 3, 7, 14, and 28 days. The results showed diffusion of Ca+2 through the defects in the dentin in MTA-filled roots with a significant increase in concentration within time.
本研究的目的是调查根管内应用三氧化矿物凝聚体（MTA）后钙离子（Ca+2）通过暴露的牙本质小管的扩散情况。使用2.5%次氯酸钠对52颗单根牙进行根管预备，每次更换锉的型号时均用其冲洗根管。此后，在牙根表面制造标准化缺损以模拟牙根外吸收。根管和外部缺损用17%乙二胺四乙酸和蒸馏水进行最终冲洗。然后将MTA粉末与盐水混合并放入根管中。除窝洞外，所有牙根表面均用两层清漆密封。根管未充填的牙齿（n = 26）作为对照。将牙齿浸泡在盐水中，然后在第1、3、7、14和28天测量Ca+2从缺损处释放到盐水中的量。结果显示，Ca+2在充填MTA的牙根中通过牙本质缺损处扩散，且其浓度随时间显著增加。
