Sugawara A, Chow L C, Takagi S, Chohayeb H
National Institute of Standards and Technology, Gaithersburg, MD.
J Endod. 1990 Apr;16(4):162-5. doi: 10.1016/S0099-2399(06)81963-1.
A calcium phosphate cement (CPC) was examined for its ability to seal the root canal when used as a sealer-filler. Extracted human teeth were divided into three groups. Root canals were filled with either CPC paste containing dicalcium phosphate anhydrous (group 1), CPC containing dicalcium phosphate dihydrate (group 2), or gutta-percha points sealed with Grossman's cement (group 3). After filling, all specimens were kept in 100% humidity for 1 day, immersed in a CaPO4 solution or distilled water at 37 degrees C for 1 wk, and then immersed in 1% Poly-R dye solution at 37 degrees C for 1 wk, after which they were rinsed and sectioned longitudinally for microscopic examination. Specimens in groups 1 and 2, especially those aged in the CaPO4 solution showed considerably less dye penetration than those in group 3. The good sealing ability of the CPC against dye penetration in vitro suggests that it may provide an adequate seal of the canal without a separate sealer.
研究了一种磷酸钙骨水泥（CPC）作为封闭剂-填充剂时封闭根管的能力。将拔除的人牙分为三组。根管分别用含无水磷酸二钙的CPC糊剂（第1组）、含二水磷酸二钙的CPC（第2组）或用格罗斯曼水泥封闭的牙胶尖（第3组）充填。充填后，所有标本在100%湿度下保存1天，于37℃浸入磷酸钙溶液或蒸馏水中1周，然后于37℃浸入1%的聚-R染料溶液中1周，之后冲洗并纵向切片进行显微镜检查。第1组和第2组的标本，尤其是在磷酸钙溶液中老化的标本，染料渗透比第3组的标本明显少得多。CPC在体外对染料渗透的良好封闭能力表明，它可能无需单独的封闭剂就能对根管提供充分的封闭。
