Wadachi R, Araki K, Suda H
Department of Endodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
J Endod. 1998 May;24(5):326-30. doi: 10.1016/S0099-2399(98)80128-3.
Calcium hydroxide [Ca(OH)2] paste can aid in the cleaning of a root canal because of its soft tissue-dissolving potential. In this study, we examined with a scanning electron microscope the dissolution by Ca(OH)2 paste of pulpal tissue attached to uninstrumented bovine root canal walls. Extracted bovine anterior teeth were divided into small specimens at the middle portion of the roots. The experimental groups were treated with sodium hypochlorite (NaOCl), Ca(OH)2, or a combination of Ca(OH)2 + NaOCl. The control group was given no treatment. The root canal walls were observed with a scanning electron microscope, and the amount of remaining pulp tissue was compared. The amount of debris was reduced remarkably in the groups treated with NaOCl for > 30 s, or Ca(OH)2 for 7 days. The combination of Ca(OH)2 + NaOCl was more effective than the separate treatments. The results suggest that Ca(OH)2 as a root canal medicine serves as an effective agent in removing tissue debris remaining on the root canal walls.
氢氧化钙[Ca(OH)₂]糊剂因其溶解软组织的能力而有助于根管清理。在本研究中，我们用扫描电子显微镜检查了氢氧化钙糊剂对附着于未预备的牛根管壁的牙髓组织的溶解情况。拔除的牛前牙在牙根中部被分成小标本。实验组分别用次氯酸钠（NaOCl）、氢氧化钙或氢氧化钙+次氯酸钠联合处理。对照组未作处理。用扫描电子显微镜观察根管壁，并比较剩余牙髓组织的量。在用次氯酸钠处理>30秒或用氢氧化钙处理7天的组中，碎屑量显著减少。氢氧化钙+次氯酸钠联合处理比单独处理更有效。结果表明，氢氧化钙作为根管用药是清除残留在根管壁上的组织碎屑的有效药剂。
