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中华口腔医学研究杂志(电子版) ›› 2016, Vol. 10 ›› Issue (06) : 389 -394. doi: 10.3877/cma.j.issn.1674-1366.2016.06.005

所属专题: 文献

基础研究

气孔缺陷对磨牙双层全瓷冠力学性能影响的有限元研究
刀力1, 何子华2, 李湘霞1, 张新平3, 简裕涛4, 赵克1,()   
  1. 1. 510055 广州,中山大学光华口腔医学院·附属口腔医院,广东省口腔医学重点实验室;510080 广州,广东省牙颌系统修复重建技术与材料工程技术研究中心
    2. 510220 广州,广东省口腔医院·南方医科大学附属口腔医院
    3. 510640 广州,华南理工大学材料科学与工程学院
    4. 510055 广州,中山大学光华口腔医学院·附属口腔医院,广东省口腔医学重点实验室
  • 收稿日期:2016-10-17 出版日期:2016-12-01
  • 通信作者: 赵克
  • 基金资助:
    国家自然科学基金(81470767)

Influence of veneer pore defects on fracture behavior of bilayered all-ceramic crowns: a finite element analysis

Li Dao1, Zihua He2, Xiangxia Li1, Xinping Zhang3, Yutao Jian4, Ke Zhao1,()   

  1. 1. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China; Guangdong Engineering Research Center of Technology and Materials for Oral Restoration and Reconstruction, Guangzhou 510080, China
    2. Guangdong Provincial Stomatological Hospital, Guangzhou 510220, China
    3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
    4. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
  • Received:2016-10-17 Published:2016-12-01
  • Corresponding author: Ke Zhao
  • About author:
    Corresponding author: Zhao Ke, Email:
引用本文:

刀力, 何子华, 李湘霞, 张新平, 简裕涛, 赵克. 气孔缺陷对磨牙双层全瓷冠力学性能影响的有限元研究[J]. 中华口腔医学研究杂志(电子版), 2016, 10(06): 389-394.

Li Dao, Zihua He, Xiangxia Li, Xinping Zhang, Yutao Jian, Ke Zhao. Influence of veneer pore defects on fracture behavior of bilayered all-ceramic crowns: a finite element analysis[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2016, 10(06): 389-394.

目的

研究饰瓷气孔缺陷对磨牙二硅酸锂(LDG)及氧化锆(Y-TZP)双层全瓷冠力学性能的影响。

方法

制作上颌第一磨牙LDG双层全瓷冠,使用显微CT扫描并三维重建分析饰瓷内气孔缺陷的尺寸及分布。分别构建上颌第一磨牙LDG及Y-TZP双层全瓷冠三维有限元模型,根据CT数据于饰瓷内添加气孔缺陷并进行加载;A组为对颌牙以200 N加载于牙冠模拟牙尖交错位时的垂直向受力;B组为以200 N与牙长轴呈45°加载于牙冠近、远中舌尖颊斜面,模拟侧方受力;C组为压头垂直位移1 mm加载于牙冠中央窝,模拟体外实验中的加载;计算最大主应力并分析气孔缺陷对其数值的影响。

结果

LDG与Y-TZP在各载荷条件下的应力分布近似;垂直向加载时牙尖接触区应力集中,最大应力分别为51.683、50.084 MPa,存在气孔时,应力集中于牙尖接触应力区的气孔缺陷,最大应力上升至290.72、285.92 MPa;45°斜向加载时拉应力集中于核瓷颈部,气孔缺陷无应力集中,最大应力不变;体外加载时中央窝、沟及加载点应力集中,最大应力为107.3、125.41 MPa,存在气孔时,应力集中于拉应力区的气孔缺陷,最大应力上升至359.93、322.39 MPa。

结论

饰瓷气孔缺陷对双层全瓷冠应力分布的影响与受载方式有关,位于拉应力集中区的气孔缺陷是导致冠失效的因素。

Objective

To evaluate the influence of veneer pore defects on fracture behavior of bilayered lithium dislicate glass-ceramic (LDG) and zirconia (Y-TZP) molar crowns.

Methods

Bilayered lithium dislicate glass-ceramic maxillary first molar crown was fabricated and scanned by micro CT to reconstruct the size and distribution of pore defects in veneering porcelain. After importing the pores in veneer according to the CT data, finite element analysis (FEA) models of bilayered LDG and Y-TZP crowns were constructed for mechanics simulation. For Group A, 200 N of Static loads were applied vertically to the occlusal surfaces of models to simulate the intercusping bite force. For Group B, 200 N loads were applied to functional inclinations at a 45° angle to imitate masticatory force. For Group C, indenter with 1 mm of vertical displacement was imposed on models to simulate the condition of in-vitro test. Maximum principle stress was calculated and analyzed accordingly.

Results

LDG and Y-TZP had similar stress distribution under the same loading protocol. For intercusping bite, stress was concentrated in the contact region and the maximum tensile stress was 51.683 MPa and 50.084 MPa, respectively. While the maximum stress raised to 290.72 MPa and 285.92 MPa when pore defects were existed at cusp contact area. For oblique loading, pore defects were free from stress concentration. Under displacement loading, pores were detrimental to veneer integrity only in regions of tensile stress located at grooves, fissures as well as contact region, the maximum stress was concentrated in pores and raised from 107.3 MPa and 125.41 MPa to 359.93 MPa and 322.39 MPa.

Conclusions

The influence of veneer pore defects was related to loading pattern and the pores located at tensile stress area of veneering porcelain would jeopardize the structure and mechanical integrity of bilayered all-ceramic crowns.

表1 有限元分析中各类模型材料的力学参数[8,9]
表2 两种饰瓷力学参数及临界气孔尺寸
图1 饰瓷内气孔缺陷的显微CT扫描及三维重建图
图2 含气孔的双层冠有限元模型构建图
图3 三种载荷条件下LDG双层全瓷冠的最大主应力分布
图4 三种载荷条件下Y-TZP双层全瓷冠的最大主应力分布
图5 三种载荷条件下含气孔LDG双层全瓷冠的最大主应力分布
图6 三种载荷条件下含气孔Y-TZP双层全瓷冠的最大主应力分布
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