多次烧结对二硅酸锂陶瓷后牙[牙合]贴面疲劳性能的影响  

Effect of repeated firings on fatigue behaviors of posterior occlusal veneers made of glass ceramic

作　　者：谷莉玲 郭永锦 程辉[2,3,4] 李秀容[2,3] 张贝洁[2,3] GU Li-ling;GUO Yong-jin;CHENG Hui;LI Xiu-rong;ZHANG Bei-jie(Department of Stomatology,Shaoguan First People’Hospital,Shaoguan 512023,Cuangdong Proince;School of Stomatology,Fujian Medical Unitersity,Fuzhou 350004,Fujian Poince;Hospital of Stomatology,Fiajian Medical University,Fuzhou 350002,Fujian Province;Research Centre of Dental Biomechanics&Aesthetics,Fuzhou 350004,Fujian Protince,China)

机构地区：[1]韶关市第一人民医院口腔科,广东韶关512023 [2]福建医科大学口腔医学院,福建福州350004 [3]福建医科大学附属口腔医院,福建福州350002 [4]福建医科大学口腔生物力学及美学研究中心,福建福州350004

出　　处：《上海口腔医学》2020年第6期586-590,共5页Shanghai Journal of Stomatology

基　　金：福建省卫生系统中青年骨干人才培养项目(2016-ZQN-58)。

摘　　要：目的:考察经不同烧结次数对后牙二硅酸锂陶瓷[牙合]贴面疲劳性能的影响。方法:制作1.2 mm厚的IPS e.max CAD(IC)和IPS e.max Press(IP)后牙[牙合]贴面,按烧结次数(1次、3次、5次、7次)分组,粘接到上颌磨牙树脂代型上,经热机械疲劳试验后(TMFT)(5-55℃5000次循环、30-300 N、10 Hz、正弦波、500000次循环),进行抗折破坏实验,记录最大断裂载荷值。应用扫描电镜、EDX和XRD分析材料的显微结构。采用SPSS 20.0软件包对数据进行统计学分析。结果:IC组烧结1次后平均载荷值最高,为(1546.73±192.85)N;IP组烧结3次后平均载荷值最高,为(1504.46±138.56)N。2组材料中,不同烧结次数对[牙合]贴面断裂载荷值无显著影响(R>0.05)。EDX和XRD分析显示,2种材料成分无显著差异。SEM观察,在多次烧结后晶体尺寸变短,孔隙率增多。结论:不同烧结次数对疲劳加载后二硅酸锂陶瓷后牙[牙合]贴面断裂载荷值有降低趋势,但无统计学差异,可满足临床要求。PURPOSE:To investigate the effect of firing times on the fatigue properties and failure modes of posterior occlusal veneers made of lithium disilicate glass ceramics.METHODS:According to the number of times of firing(1,3,5,7 times),IPS e.max CAD(IC)and IPS e.max Press(IP)occlusal veneer restorations with a thickness of 1.2 mm were prepared,and then cemented to the maxillary molar composite resin dies.Each group was subjected to thermo-mechanical fatigue(TMFT)test(5-55℃,5000 cycles,30-300 N,10 Hz,sinusoidal wave,500000 cycles)and compressive loading.The maximum force at fracture was recorded.Stereomicroscope and scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDX)and X-ray diffraction(XRD)were adopted to analyze the failure modes and microstructural features.Statistical analysis was performed with SPSS 20.0 software package.RESULTS:The highest average loads(N)at fracture for IC groups were(1546.73±192.85)N after one firing time;in IP group,the highest average loads were(1504.46±138.56)N after three firing times.There was no significant difference in the fracture load with different firing times for IC/IP(P>0.05).EDX and XRD analysis showed no significant difference in the composition of two materials.SEM showed that the size of crystal was shorter and the porosity increased after multiple firing.CONCLUSIONS:After repeated firing,the fatigue loading of lithium disilicate glass ceramics has a decreasing trend of fracture load value without any significant difference,and it meets clinical requirements.

关 键 词：贴面 二硅酸锂基玻璃陶瓷 烧结次数 疲劳性能 

分 类 号：R783.1[医药卫生—口腔医学]