GI-Ⅱ型渗透陶瓷收缩率和弯曲强度测试  

Determination of Shrinkage and Bending Strength of GI-Ⅱ Infiltrated Ceramic

作　　者：王航[1] 巢永烈[1] 廖运茂[2] 孙俊[1] 

机构地区：[1]华西医科大学口腔医学院口腔修复学教研室,成都610041 [2]华西医科大学卫生部口腔生物医学工程重点实验室

出　　处：《华西医科大学学报》2001年第4期524-525,共2页Journal of West China University of Medical Sciences

基　　金：四川省卫生厅科研基金资助 (编号 970 10 6 )

摘　　要：目的　测试 GI- 型渗透陶瓷收缩率和强度 ,为其临床应用提供依据。方法　粉浆涂塑氧化铝 ,制作坯体 ,112 5℃烧结 2小时 ,再分为两组 ,分别在 112 5℃和 110 0℃下用玻璃渗透 6小时 ,完成 GI- 型渗透陶瓷试件。而后测试坯体和渗透陶瓷的长度 ,计算收缩率 ,并用三点弯曲法测试渗透陶瓷强度。结果　 112 5℃渗透的渗透陶瓷收缩率、强度及 Weibull模数分别为 0 .2 89± 0 .15 5 %、36 7.7± 76 .1MPa和 4.79;110 0℃渗透的渗透陶瓷分别为 0 .2 5 3± 0 .0 43%、377.5± 6 4.4MPa和 5 .5 2。两者比较无统计学差异 (P>0 .0 5 ) ,但两组渗透陶瓷强度与30 0 MPa比较均有统计学差异 (P<0 .0 5 )。结论　渗透陶瓷收缩完全可以隙料和石膏膨胀所补偿 ,其强度能满足全瓷桥核型材料的要求 ,可供制作全瓷冠桥核型。Objective To determine the shrinkage and strength of GI Ⅱ Infiltrated Ceramic for providing scientific basis of its clinical use. Methods The adobes by slip casting alumina powder of GI Ⅱ Infiltrated Ceramic were sintered at 1125℃ for 2 hours. The sintered alumina bodies were then divided into two groups and infiltrated by melt glass at 1125℃ and 1100℃ respectively for 6 hours.The length of the infiltrated ceramic specimens before and after fabrication was determined to calculate shrinkage. Their strength values were obtained by 3 point bending test. Results The infiltrated ceramic infiltrated at 1125℃ was 0.289±0.155% in shrinkage, 367.7±76.1 MPa in strength, and 4.79 in Weibull modulus; that infiltrated at 1100℃ was 0.253±0.043%, 377 5± 64.4 MPa, and 5.52, respectively. There was no statistically significant difference between those two groups. But their strength values were statistically high, compared with 300MPa. Conclusion The shrinkage of GI Ⅱ Infiltrated Ceramic could be compensated by brushing spacer on dies and expansion of die stone. Its strength satisfied the requirement for clinical use of all ceramic bridge materials. This kind of high strength and low shrinkage ceramic could be used for fabricating all ceramic crown and bridge core.

关 键 词：牙科陶瓷 渗透陶瓷 全瓷 收缩 强度 

分 类 号：R783.1[医药卫生—口腔医学]