北京大学学报(医学版) ›› 2015, Vol. 47 ›› Issue (1): 78-84.

• 论著 • 上一篇    下一篇

一体化计算机辅助设计与制作氧化锆桩核的三维有限元分析

周团锋1,2*,张相皞3*,王新知1△   

  1. (1.北京大学口腔医学院·口腔医院修复科 ,北京100081;2.北京大学口腔医学院·口腔医院第一门诊部,北京 100034;3.北京大学口腔医学院·口腔医院第二门诊部,北京100101)
  • 出版日期:2015-02-18 发布日期:2015-02-18

Three-dimensional finite element analysis of one-piece computer aided design and computer aided manufacture involved zirconia post and core

ZHOU Tuan-feng1,2*, ZHANG Xiang-hao3*, WANG Xin-zhi1△   

  1. (1. Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China; 2. First Clinical Division, Peking University School and Hospital of Stomatology, Beijing 100034, China; 3. Second Clinical Division, Peking University School and Hospital of Stomatology, Beijing 100101, China)
  • Online:2015-02-18 Published:2015-02-18

摘要: 目的:采用三维有限元法,比较分析一体化计算机辅助设计与制作(computer aided design and computer aided manufacture, CAD/CAM)氧化锆桩核修复的生物力学特点。方法:采用几何的方法分别构建一体化CAD/CAM氧化锆桩核(第1组)、预成氧化锆桩铸瓷核(第2组)、金合金桩核(第3组)上中切牙修复的三维有限元模型,分别通过牙轴与切缘垂直方向和与牙体长轴45°角斜下方向100 N加载,模拟上、下切牙相对时和下颌前伸运动时的两种受力情况。结果:垂直静加载下,无牙本质肩领设计,一体化CAD/CAM氧化锆桩核组牙根的最大Von-Mises应力值最小(11.02 N),预成氧化锆桩组最大(13.17 N),应力分布从切端向根方逐渐递减。2.0 mm高牙本质肩领存在时,桩核及牙根的最大Von-Mises应力值均减小。45°斜向静加载下,在无肩领设计时,一体化CAD/CAM氧化锆桩核的最大Von-Mises应力值最大(20.45 N),金合金桩核的值最小(13.61 N)。2.0 mm高牙本质肩台存在时,牙根的应力值均有减小的趋势,金合金桩核修复组牙根最大Von-Mises应力值最大(14.10 N),一体化CAD/CAM氧化锆桩核修复组牙根应力最小(13.38 N)。结论:通过三维有限元分析推测:相同根管直径的一体化CAD/CAM氧化锆桩核相比预成氧化锆全瓷桩铸瓷核和金合金桩核能更好地分担垂直和侧向的咬合力,并且能够降低牙根的应力分布,起到保护基牙,维护修复体完整性的作用。

关键词: 计算机辅助设计, 氧化锆, 桩核技术, 有限元分析

Abstract: Objective: To analyze the biomechanics trait of one-piece computer aided design and computer aided manufacture (CAD/CAM) zirconia post and core by the three-dimensional finite element.  Methods: The three-dimensional finite element models of three upper central incisors restored with one-piece CAD/CAM zirconia post and core (group 1), refabricated zirconia post and hot-pressed porcelain core (group 2), and cast gold alloy post and core (group 3) were built by geometry method respectively. 100 N vertical loading through the central incisor models long axis and 100 N loading along directing at an angle of 45° with the models long axis were used to imitate the central incisor stress state in biting and mandible physiological protraction movement. Results: Under vertical loading, the restored teeth without dentin ferrule, the maximum VonMises stress value of the tooth root in group 1 was the least(11.02 N), which was the largest (13.17 N)in group 2. The stress became weaker from the upper to the lower of the tooth root. The maximum Von-Mises stress value of the tooth root, post and core became smaller while the restored teeth with the 2.0 mm high dentin ferrule. Under directing at an angle of 45° loading, without the design of dentin ferrule in the restored teeth, the maximum Von-Mises stress value of the post and core in group 1 was the greatest(20.45 N), while that stress of post and core in group 3 was the smallest(13.61 N). With 2.0 mm high dentin ferrule design in the restored teeth, the tooth root stress became weaker. The maximum Von-Mises stress value of the tooth root was the greatest (14.10 N) in group 3, but which was the lowest (13.38 N) in group 1. Conclusion: The results of the three-dimensional finite element analysis infers that one-piece zirconia post and core restoration is more beneficial to disperse the bite force than the prefabricated zirconia post and the cast gold alloy post and core. The onepiece of zirconia post and core is good to protect the teeth and keep the restoration intact.

Key words: Computer-aided design, Zirconia, Post and core technique, Finite element analysis

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