Sevimay S, Oztan M D, Dalat D
Department of Endodontics, Faculty of Dentistry, University of Ankara, Ankara, Turkey.
J Oral Rehabil. 2004 Mar;31(3):240-4. doi: 10.1046/j.0305-182X.2003.01225.x.
The purpose of this in vitro study was to examine the coronal leakage of canals medicated with Ca(OH)(2) compared with the canals which did not receive Ca(OH)(2) medication before obturation with laterally condensed gutta-percha points and sealer. Sixty-one single rooted permanent canines and premolars were used. The crowns were removed from the cemento-enamel junction. After the canals were chemomechanically prepared, the roots were divided into three experimental groups as group 1, 2 and 3. The canals in group 1 and 2 were treated with ethylenediaminetetraacetic acid (EDTA) and NaOCl in order to remove the smear layer and then the canals were filled with Ca(OH)(2) paste. The coronal 3 mm of the cavities were sealed with Cavit and the samples were kept in an incubator at 37 degrees C for 7 days. No intra-canal medication was applied in group 3. The root canals were irrigated with NaOCl in group 1 and with EDTA and NaOCl in group 2, in order to remove Ca(OH)(2) before obturation. Two samples from group 1 and two from group 2 were examined under SEM in order to reveal the removal of Ca(OH)(2) paste. Following this, the canals in the experimental groups were obturated with gutta-percha and sealer. The roots were placed in India ink for 7 days and the linear dye penetration was evaluated. No significant statistical difference was found in the amount of coronal dye leakage between experimental groups (P > 0.05). The results of the present study indicated that the application of Ca(OH)(2) as a temporary dressing material had no effect on coronal leakage.
本体外研究的目的是，在使用侧向加压牙胶尖和封闭剂进行充填之前，比较用氢氧化钙（Ca(OH)₂）药物处理的根管与未接受Ca(OH)₂药物处理的根管的冠部微渗漏情况。使用了61颗单根恒牙犬齿和前磨牙。将牙冠从牙骨质-釉质界处去除。在对根管进行化学机械预备后，将牙根分为1组、2组和3组三个实验组。1组和2组的根管先用乙二胺四乙酸（EDTA）和次氯酸钠（NaOCl）处理以去除玷污层，然后用Ca(OH)₂糊剂充填。窝洞的冠部3mm用Cavit封闭，样本置于37℃的培养箱中保存7天。3组未进行根管内用药。1组根管用NaOCl冲洗，2组用EDTA和NaOCl冲洗，以便在充填前去除Ca(OH)₂。从1组和2组各取两个样本进行扫描电子显微镜（SEM）检查，以观察Ca(OH)₂糊剂的去除情况。在此之后，对实验组的根管用牙胶和封闭剂进行充填。将牙根置于印度墨水中7天，并评估线性染料渗透情况。实验组之间的冠部染料渗漏量未发现显著统计学差异（P>0.05）。本研究结果表明，应用Ca(OH)₂作为临时充填材料对冠部微渗漏没有影响。
