髓腔固位冠不同修复材料和厚度对应力分布的影响  

Effects of the different materials and thicknesses on endocrown stress distribution

作　　者：林捷[1] 林珍香[2] 郑志强[1] LIN Jie;LIN Zhenxiang;ZHENG Zhiqiang(Department of VIP Dental Service,School and Hospital of Stomatology,Fujian Medical Universi-ty,Fuzhou 350002,China;Department of Stomatology,Hospital of Fujian Provincial Authorities,Fuzhou 350003,China)

机构地区：[1]福建医科大学附属口腔医院特诊科,福建福州350002 [2]福建省级机关医院口腔科,福建福州350003

出　　处：《口腔疾病防治》2021年第11期740-745,共6页Journal of Prevention and Treatment for Stomatological Diseases

基　　金：国家自然科学基金项目(81300907);福建省卫生计生中青年骨干人才培养项目(2016ZQN60)。

摘　　要：目的使用有限元方法分析不同修复材料和面空间厚度对髓腔固位冠修复根管治疗后磨牙应力分布的影响。方法建立下颌第一磨牙牙体缺损髓腔固位冠修复有限元模型,采用4种不同修复材料:2种树脂基陶瓷(Lava Ultimate、Vita Enamic);1种二硅酸锂陶瓷(IPS e.max CAD);1种氧化锆陶瓷(Cercon),并设计4种面空间厚度:1、2、3、4 mm。在面垂直和倾斜两方向分别加载600 N模拟最大咬合力,使用有限元软件ANSYS 10.0分析应力分布。结果垂直加载分析显示,冠部应力1 mmCercon组(211.30 MPa)最高,4 mmLava Ultimate组(11.56 MPa)最低;牙本质应力3 mmLava Ultimate组(38.84 MPa)最高,1 mmCercon组(11.68 MPa)最低。牙周膜和周围牙槽骨中的应力变化很小。倾斜加载分析显示,冠部应力1 mmCercon组(78.73 MPa)最高,1 mmLava Ultimate组(35.51 MPa)最低;牙本质应力1 mmCercon颈部组(41.63 MPa)最高,4 mmCercon冠部组(10.81 MPa)最低。倾斜加载时水门汀和颈部牙本质的应力集中较垂直加载高。结论随着髓腔固位冠弹性模量增加,冠修复体的应力呈现上升趋势,牙体中的应力呈现下降趋势;随着冠厚度增加,冠修复体的应力呈现下降趋势。Objective To analyze the effects of different restorations and the thickness of the occlusal space on the stress distribution of endodontically treated molars with endocrowns.Methods The finite element model of the restoration of the first mandibular molar was created,and four different endocrown materials were used including two resin based ceramics(Lava Ultimate,Vita Enamic),one lithium disilicate ceramic(IPS e.max CAD)and one zirconia ceramics(Cercon),and four kinds of surface space thickness were designed:1 mm,2 mm,3 mm and 4 mm.A total of 600 N was loaded to simulate the maximum bite force in the vertical and inclined directions,and the finite element software ANSYS 10.0 was used to analyze the stress distribution.Results The vertical loading analysis showed that the crown stress of the 1 mmCercon group was the highest at 211.30 MPa,and that of the 4 mmLava Ultimate group was the lowest at 11.56 MPa;the highest dentin stress was 38.84 MPa in the 3 mmLava Ultimate group,and the lowest was 11.68 MPa in 1 mmCercon group.The stress in the periodontal ligament and alveolar bone had little change.The inclined loading analysis showed that the crown stress of the 1 mmCercon group was the highest at 78.73 MPa and that of the 1 mmLava Ultimate group was the lowest at 35.51 MPa;the highest dentin stress was 41.63 MPa in the 1 mmCercon cervical group,and the lowest was 10.81 MPa in the 4 mmCercon coronal group.The stress concentration of cement and cervical dentin under inclined loading was higher than that under vertical loading.Conclusion The results of finite element analysis show that the elastic modulus of the endocrown increases,the stress of the crown restoration shows an upward trend,and the stress in the tooth shows a downward trend.With increasing crown thickness,the stress of the crown prosthesis decreased.

关 键 词：髓腔固位冠 厚度 氧化锆 树脂基陶瓷 二硅酸锂陶瓷 氧化锆陶瓷 有限元方法 应力分布 

分 类 号：R78[医药卫生—口腔医学]