玻璃离子水门汀加入改良纳米羟基磷灰石后的性能

摘要

BACKGROUND:The glass ionomer cement has good biological stability and can sustain the release of fluoride, which has been used as dental repair materials. But because of its low mechanical strength, the glass ionomer cement is confined to the front teeth and other parts with smal er force. OBJECTIVE:To analyze the compressive strength, microleakage and other physical performances of Fuji IX glass ionomer cement after the addition of 8%modified nano-hydroxyapatite. METHODS:(1) Universal testing machine was applied to detect the compressive strength of Fuji IX glass ionomer cement, Fuji IX glass ionomer cement added with 8%modified nano-hydroxyapatite, and super glass ionomer to fil the stainless steel cylinder. (2) Fuji IX glass ionomer cement, Fuji IX glass ionomer cement with 8%modified nano-hydroxyapatite and super glass ionomer were used to fil the tooth cavity;then, the microleakage was detected. (3) Fuji IX glass ionomer cement, Fuji IX glass ionomer cement added with 8%modified nano-hydroxyapatite, and super glass ionomer were used to fil stainless steel rectangular specimens. Then, universal material testing machine was applied to detect the bending strength value. RESULTS AND CONCLUSION:The compressive strength, microleakage, and bending strength of specimens fil ed with Fuji IX glass ionomer cement the addition of 8%modified nano-hydroxyapatite were better than the other two groups, and Fuji IX glass ionomer cement was superior to the super glass ionomer in the compressive strength, microleakage and bending strength of fil ed specimens. It is shown that Fuji IX glass ionomer cement after addition of 8%improved nano-hydroxyapatite can improve the compressive strength and microleakage.%背景：玻璃离子水门汀具有良好的生物稳定性和持久的氟离子释放性，被用于齿科修复领域的材料，但由于其机械强度较低，局限于前牙等受力较小部位的齿科修复。　　目的：分析加入8%改良型纳米羟基磷灰石后，而至富士IX 玻璃离子水门汀的抗压强度﹑密合度等物理性能。方法：①分别以而至富士IX 玻璃离子水门汀、加入8%改良型纳米羟基磷灰石的而至富士IX 玻璃离子水门汀及超强玻璃离子充填不锈钢圆柱体，采用万能实验机检测各组抗压强度。②分别以而至富士IX 玻璃离子水门汀、加入8%改良型纳米羟基磷灰石的而至富士IX 玻璃离子水门汀及超强玻璃离子充填人离体牙窝洞，观察各组充填体与牙体间的密合度。③分别以而至富士IX 玻璃离子水门汀、加入8%改良型纳米羟基磷灰石的而至富士IX玻璃离子水门汀及超强玻璃离子充填不锈钢矩形试件，采用万能材料测试机检测各组弯曲强度值。　　结果与结论：加入改良型纳米羟基磷灰石而至富士IX 玻璃离子水门汀填充试件的抗压强度、密合度及弯曲强度均优于其他两组，并且而至富士IX 玻璃离子水门汀填充试件的抗压强度、密合度及弯曲强度均优于超强玻璃离子填充试件组。表明加入8%的改良型纳米羟基磷灰石的而至富士IX 玻璃离子水门汀抗压强度﹑密合度均有提高。