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[1]马 璐,曲爱丽,景 捷.侧向拉力螺钉坚固内固定髁突矢状骨折愈合进程中的三维有限元分析[J].宁夏医科大学学报,2018,(04):412-417.[doi:10.16050/j.cnki.issn1674-6309.2018.04.009]
 MA Lu,QU Aili,JING Jie.Three-dimensional Finite Element Analysis on Healing Process of Solid Internal Fixation with Lateral Lag Screw of Condyle Sagittal Fracture[J].Ningxia Medical University,2018,(04):412-417.[doi:10.16050/j.cnki.issn1674-6309.2018.04.009]
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侧向拉力螺钉坚固内固定髁突矢状骨折愈合进程中的三维有限元分析(PDF)
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《宁夏医科大学学报》[ISSN:1005-8486/CN:64-1029/R]

卷:
期数:
2018年04期
页码:
412-417
栏目:
论 著
出版日期:
2019-09-30

文章信息/Info

Title:
Three-dimensional Finite Element Analysis on Healing Process of Solid Internal Fixation with Lateral Lag Screw of Condyle Sagittal Fracture
作者:
马 璐1 曲爱丽2 景 捷3
(1. 宁夏医科大学, 银川 750004; 2. 宁夏大学机械工程学院, 银川 750021; 3. 宁夏医科大学总医院口腔颌面外科, 银川 750004)
Author(s):
MA Lu1 QU Aili2 JING Jie3
(1. Ningxia Medical University, Yinchuan 750004; 2. Mechanical Engineering School of Ningxia University, Yinchuan 750021; 3. Department of Oral and Maxillofacial Surgery, the General Hospital of Ningxia Medical University, Yinchuan 750004)
关键词:
髁突矢状骨折侧向拉力螺钉三维有限元
Keywords:
condylar sagittal fracture lateral lag screw three-dimensional finite
分类号:
R782
DOI:
10.16050/j.cnki.issn1674-6309.2018.04.009
文献标志码:
A
摘要:
目的 通过建立侧向拉力螺钉坚固内固定髁突矢状骨折三维有限元模型,分析骨折愈合进程中生物力学相关因素的改变。方法 使用Mimics14.0、Imageware13.2及Ansys15.0软件建立Ⅱ型髁突矢状骨折三维有限元模型,模拟临床使用侧向拉力螺钉坚固内固定,设立12周骨折达到完全愈合,通过改变骨折裂隙的弹性模量模拟骨折愈合的进程。分别在0、4、8、12周对骨折愈合过程中的各项生物力学指标进行有限元分析。结果 建立了包含有下颌骨、牙列、咀嚼肌、关节盘、关节囊的下颌骨TMJ三维有限元模型,模型共790431节点,526873单元。术后当天拉力螺钉的最大等效应力为71.5549MPa,髁突的最大等效应力为44.5878MPa,应力集中的部分为髁突骨折线的残端侧,其余部位几乎不受力。术后4~12周髁突应力分布的区域由骨折线的残端侧向游离端扩大,但应力的大小无显著变化,约为6.8MPa,拉力螺钉的最大等效应力值由17.8074MPa 降至13.9973MPa,虽有递减的趋势,但仍大于髁突所承受的应力。骨折愈合期间整体下颌骨、髁突整体及髁突游离端的最大位移均无明显变化。结论 在骨折愈合进程中,双拉力螺钉可为下颌骨SFMC提供坚固有效的固定效果,拉力螺钉的应力遮挡可能与髁突吸收、改建有关。
Abstract:
Objective A three-dimensional finite element model of sagittal fracture of the condyle was established by lateral lag screw fixation to analyze the changes of biomechanics in the process of fracture healing. Methods Using Mimics14.0,Imageware13.2 and Ansys15.0 software to establish a three-dimensional finite element model of II condylar sagittal fracture, and to simulate the clinical use of lateral lag screw sturdy internal fixation. The 12 week fracture was established to achieve complete healing, and the process of fracture healing was simulated by changing the elastic modulus of fracture. The biomechanical indexes of fracture healing process were analyzed by finite element method at 0,4,8 and 12 weeks respectively. Results A TMJ three-dimensional finite element model including the mandible,dentition,masticatory muscles,articular discs, and joint capsules was established. The model has a total of 790431 nodes,526873 units. On the day after surgery, the maximum equivalent stress of the lag screw was 71.5549 MPa, and the maximum equivalent stress of the condyle was 44.5878 MPa. The part of the stress concentration was the stump side of the mandibular fracture line, and the remaining part was almost unforced. The area of the condylar stress distribution was expanded from the stump lateral to the free end of the fracture line 4~12 weeks after surgery, but the magnitude of the stress did not change significantly and was approximately 6.8 MPa. The maximum equivalent stress value of the lag screw was reduced from 17.8074 MPa to 13.9973 MPa. Although there was a decreasing trend, it was still greater than the stress by the condyle. There was no significant change in the maximum displacement of the mandible,the condyle,and the free end of the condylar process during fracture healing. Conclusion In the process of fracture healing,the double-screw screws can provide a solid and effective fixation effect for the mandibular SFMC. The stress shielding of the lag screw may be related to the absorption and reconstruction of the condylar process.

参考文献/References:


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备注/Memo

备注/Memo:
收稿日期:2018-03-07
基金项目:宁夏回族自治区科技攻关项目(2016KJHM51);宁夏回族自治区留学人员创新创业项目。
作者简介:马璐(1992-),女,在读硕士研究生,研究方向:口腔颌面外科学。
通信作者:景捷,男,教授,主任医师,硕士研究生导师,研究方向: 口腔颌面外科学。E-mail:jjdreamer@163.com
更新日期/Last Update: 2018-04-30