【摘要】 <正> 近二十年来,对用于人造骨和人造齿根的生物玻璃和生物微晶玻璃,国内外已进行了大量研究并成功地通过了动物实验,目前正处在临床应用试验阶段。但在研制修复齿冠和牙而材料方面,具有更高的要求。不仅要求力学强度和硬度更高,化学稳定性更高(抗唾液的浸(?)和冲刷、抗食物的酸碱、抗大气的侵蚀)和热稳定性良好,而且应具有与天然牙相近的外观和色泽。此外,这种材料必须具有良好的成形性能以满足既薄又形状复杂的牙冠和牙更多还原

【Abstract】 A New bioglass ceramic material for dental restoration was developed by the combination of erystallization and hydrothermal synthesis processes based on the CaO-SiO2-P2O5 glass system.In this material,the major crystalline phase of the apatite solid solution [Ca10(PO4)6F2-x(OH)x] similar to the natural dentin [Ca10(P04)6(OH)2] in structure and composition was identified by DTA,XRD and IE.The final material had a high bending strength(142MPa),high fracture toughness (4.75 MPa·m1/2),high hardness(VHN5.33GPa).Moreover the density,refractive index,thermal expansion coefficient and translucency were approximate to natural tooth.The material showed a high durability in the pseudo-salivary solution and had non-toxicity and excellent tissue compatibility.Therefore,this material is expected to be an excellent dental restoration used for artificial dental crown and aesthetieal veneer.更多还原