牙科氧化锆／磷酸镧复相可切削陶瓷断裂机制及加工性能评价  

Evaluation and mechanism of a new dental machinable zirconium oxide/La-monazite diphase ceramic

作　　者：王申[1] 张保卫[2] 顾峰[3] 

机构地区：[1]上海交通大学医学院附属第九人民医院口腔颅颌面种植科上海市口腔医学重点试验室,200011 [2]上海交通大学医学院附属第九人民医院口腔修复科,上海市200011 [3]上海大学材料科学与工程学院先进无机材料制备工艺实验室,上海市200072

出　　处：《中国组织工程研究与临床康复》2009年第29期5682-5686,共5页Journal of Clinical Rehabilitative Tissue Engineering Research

基　　金：上海市重点(优势)学科建设项目资助(Y0202);上海市科学技术委员会资助(034119926)~~

摘　　要：背景:有研究提出在氧化锆中添加一定量低机械强度的辅助相如磷酸稀土类化合物等,可降低其强度,使其物理机械性能满足可切削加工的要求,降低加工成本。目的:对牙科氧化锆/磷酸镧复相可切削陶瓷的机械性能和加工性能进行评价。设计、时间及地点:对比观察实验,于2005-07/2008-06在上海市口腔医学研究所,上海大学材料学院先进无机材料制备工艺实验室完成。材料:实验以3Y-ZrO2,LaPO4,Y2O3粉体为原料制备氧化锆/磷酸镧复相陶瓷,根据磷酸镧含量的不同分为0%,10%,20%,30%,40%组。方法:在EZ-100万能实验机上测试其三点弯曲强度,采用压痕法测定试件的断裂韧性,采用显微硬度仪测试试件的维氏硬度。试件在CEREC牙科CAD/CAM系统上进行加工,计算机切削嵌体的预设时间为320s,观察瓷块在预定时间内是否可以完成嵌体的加工制作。试件夹持固定在台式钻床上,在恒定钻速和恒定轴向压力情况下用硬质合金钻头测定每个试件的钻孔深度。扫描电镜观察试样弯曲断口显微形貌。主要观察指标:三点弯曲强度、断裂韧性、维氏硬度、可切削性能评价、钻孔深度、试样断口显微形貌。结果:①随着磷酸镧含量的增加陶瓷材料的弯曲强度、维氏硬度均呈下降趋势;10%磷酸镧含量组的断裂韧性高于0%磷酸镧含量组,然后从最高的6.62MPa?m1/2下降到2.10MPa?m1/2。②切削实验结果显示,30%,40%磷酸镧含量组在切削预设的320s的时间内完成了大小体积相同的嵌体加工。而0%及10%,20%组在320s的预设时间内无法完成嵌体的加工。③钻削实验结果显示,随着磷酸镧含量的增加,氧化锆/磷酸镧复相陶瓷钻孔的深度有逐渐加深的趋势。④氧化锆/磷酸镧复相陶瓷断裂形式以晶粒去除为主,磷酸镧在两相体系中的断裂呈层片状形式。结论:通过改变磷酸镧含量可以获得不同机械强度的瓷块,在保证其可加工性�BACKGROUND： Previous research has reported that a certain content of assistant phase, such as phosphoric acid/rare earth compound, with low mechanical strength, which was added in zirconium oxide, could decrease the strength and reduce processing cost. OBJECTIVE： To evaluate mechanical and processing performances of oral machinable zirconium oxide/La-monazite diphase （LaPO4/3Y-ZrO2） ceramic. DESIGN, TIME AND SETTING： A contrast observation was performed at Shanghai Institute of Oral Medicine, Advanced Laboratory of Inorganic Materials Processing, Materials College of Shanghai University from July 2005 to June 2008. MATERIALS： 3Y-ZrO2, LaPO4, and Y2O3 powder was used to make LaPO4/3Y-ZrO2 ceramic, which was divided into 0%, 10%, 20%, 30%, and 40% groups. METHODS： Bending strength at three points were detected using EZ-100 omnipotent apparatus, fracture toughness was measured with indentation method, and Vickers hardness was tested using microhardness apparatus. The samples were tested on CAD/CAM system. The preset time of cutting was 320 seconds, of which whether the LaPO4/3Y-ZrO2 ceramic could finish the inlay processing or not. The samples were fixed on desk-top driller, and the drilling depth was tested using carbide drill at constant velocity and axonal pressure. Morphology of bending incision was observed under scanning electron microscope. MAIN OUTCOME MEASURES： Bending strength at three points, fracture toughness, Vickers hardness, cutability, drilling depth, and morphology of bending incision. RESULTS： （1） With the increasing content of LaPO4, bending strength and Vickers hardness were decreased; fracture toughness in the 10% LaPO4 group was higher than 0% LaPO4 group; finally, the fracture toughness decreased from 6.62 MPa,m1/2 to 2.10 MPa-m^1/2. （2） Cutting test demonstrated that 30% and 40% LaPO4 could finish the inlay processing within the predetermined time; however, 0%, 10%, and 20% LaPO4 did not finish the inlay processing. （3） Drilling test indicated that with the incr

关 键 词：氧化锆 磷酸镧 机械性能 可加工性 计算机辅助设计制作 

分 类 号：R318[医药卫生—生物医学工程]