齿科可切削渗透陶瓷用低熔生物微晶玻璃

Study of a Low -melting Temperature Bioactive Glass for Dental Machinable Infiltrated Ceramic

选择了1种SiO_2-MgO-Al_2O_3-K_2O-CaO-P_2O_5-F体系玻璃成分,制备了不同ZnO添加量的齿科渗透陶瓷用可切削生物微晶玻璃。结果表明,添加9%的ZnO,可使母玻璃的熔化澄清温度降至1300℃,降低了干压成型的纳米α-氧化铝多孔坯体的玻璃渗透温度;晶化后的微晶玻璃呈现出独特的球状组织特征,析出相主要为云母、氟磷灰石、假蓝宝石和辉石相等。该体系微晶玻璃兼具良好的切削性能和较高的抗弯强度。

A basic composition, the glass system SiO2-MgO-Al2O3-K2O-CaO-P2O5-F, was selected in this study. A series of machinable bioactive glass ceramic having different contents of ZnO have been investigated, which are suitable for infiltration into the green body of nanocrystalline alumina used in dental restoration. The results show that the addition of ZnO can reduce the melting temperature of the glass to 1 300degreesC, and the infiltrating temperature of as-cast glass to the green body of alpha nanocrystalline alumina made by the method of dry-pressed. After crystallization, the glass ceramic is mainly composed of spherical structures (a combination of the crystals phases) , and the main phases are mica, apatite, sapphirine and augite. The glass ceramic shows good machinability and high strength.