具有多孔和支撑结构的修复体重建下颌骨节段性缺损的生物力学研究
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1.西安医学院口腔医学院 陕西 西安;2.空军军医大学口腔医学院 陕西 西安;3.中国人民解放军总医院口腔颌面外科 北京

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国家自然科学基金资助项目(81801034);陕西省西安市未央区科技计划项目(201929);西安医学院高层次人才引进(2018RCYJ03);陕西省科技厅重点研发计划一般项目(2020SF-023)*通讯作者:刘昌奎,教授,E-mail:dentistlck@126.com


Biomechanical study on reconstruction of segmental mandibular defectswith prosthesis with support and porous structure
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1.College of Stomatology,Xi’an Medical University,Xi’an;2.College of Stomatology,the Air Force Military Medical University,Xi’an;3.General Hospital of PLA

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    摘要:

    目的 设计一种具有多孔和支撑结构的个性化钛下颌修复体,通过有限元分析其应力分布特征,评估修复体的临床应用价值及应用前景。方法 拔除比格犬右侧下颌第四前磨牙及磨牙,愈合三个月后拍摄螺旋CT并建立下颌三维模型,模拟手术过程切除3cm下颌骨并用个性化修复体重建,该修复体由基牙、支柱、实体单元、多孔单元及固位单元组成。建立个性化钛下颌修复体有限元模型A,分析负荷时修复体的峰值应力,当构成假体每部分的最大应力均小于其材料的屈服强度时进行下一步研究;构建假体、下颌骨以及螺钉装配完成的有限元模型B,加载咀嚼力,记录下颌骨的应力、应变及位移分布。结果 当基牙垂直加载载荷100N时,修复体实体结构的峰值应力为147.03MPa;多孔结构的峰值应力为75.36MPa,均小于其材料的屈服强度;皮质骨的峰值应力和应变分别为53.713 MPa和3753.6μ,松质骨的峰值应力和应变分别为4.2167 MPa和3562.5μ,修复体最大位移0.3383 mm。结论 以犬下颌骨为例,设计并通过有限元分析了具有多孔和支撑结构的个性化修复体显示出均匀的应力分布和较好的力学性能,为修复下颌骨缺损的假体设计提供了一种新的方法。

    Abstract:

    Objective: Design a personalized titanium mandibular prosthesis with porous and support structure, and analyze its stress distribution characteristics through finite element analysis to evaluate the clinical value and prospect of the prosthesis. Methods: The fourth mandibular premolar and molar of the right mandible of Beagle dogs were removed, three months after healing, spiral CT was taken and a three-dimensional model of the mandible was established. The prosthesis consists of abutment, pillar, solid unit, porous unit and retention unit. Establish a personalized titanium mandibular prosthesis finite element model A, analyze the stress of the prosthesis at load, and proceed to the next study when the maximum stress of each part constituting the prosthesis is less than the yield strength of its material; Construct a finite element model B of the assembly of the prosthesis, mandible and screw, load the average mastication force, record stress, strain and displacement distribution of the mandible. Results: When the abutment is vertically loaded with a load of 100N, the peak stress of the prosthetic solid structure is 147.03MPa; the peak stress of the porous structure is 75.36MPa, which is less than the yield strength of its material; the cortical bone the peak stress and strain were 53.713 MPa and 3753.6μ, the peak stress and strain of cancellous bone were 4.2167 MPa and 3562.5μ, respectively, and the maximum displacement of the restoration was 0.3383 mm. Conclusion: Taking the canine mandible as an example, the individualized prosthesis with porous and support structure showed a uniform stress distribution and good mechanical properties through finite element analysis, which provided a new method for the design of prosthesis to repair mandibular defects.

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  • 收稿日期:2020-06-19
  • 最后修改日期:2020-09-05
  • 录用日期:2020-09-10
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