口腔医学研究

口腔医学研究 ›› 2021, Vol. 37 ›› Issue (3): 250-254.DOI: 10.13701/j.cnki.kqyxyj.2021.03.015

• 口腔颌面外科学研究 • 上一篇    下一篇

下颌骨正中联合部囊性病变有限元建模及生物力学研究

庞亚倩1, 刘亮1, 冯大军2, 李婕1, 王栋1, 张凯1*   

  1. 1.蚌埠医学院第一附属医院口腔科 安徽 蚌埠 233000;
    2.安徽医科大学第四附属医院口腔颌面外科 安徽 合肥 230001
  • 收稿日期:2020-09-21 发布日期:2021-03-19
  • 通讯作者: *张凯,E-mail:zk29788@163.com
  • 作者简介:庞亚倩(1994~ ),女,山东潍坊人,硕士在读,医师,研究方向口腔全科。
  • 基金资助:
    安徽医科大学校科研基金项目(编号:2019xkj151)

Finite Element Modeling and Biomechanics Analysis of Cystic Lesions in Mandibular Central Junction Part

PANG Yaqian1, LIU Liang1, FENG Dajun2, LI Jie1, WANG Dong1, ZHANG Kai1*   

  1. 1. Department of Stomatology, the First Hospital Affiliated to Banghu Medical College. Bengbu 233000, China;
    2. Department of Oral and Maxillofacial Surgery, the Fourth Affiliated Hospital of Anhui Medical University, Hefei 230001, China
  • Received:2020-09-21 Published:2021-03-19

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摘要： 目的:建立下颌骨正中联合部囊性病变三维有限元模型,探讨功能载荷下病变区的生物力学特点以及应力分布情况。方法:选用牙颌系统正常的健康成年女性志愿者,以下颌骨螺旋CT扫描数据为基础,结合Mimics、Geomagic Studio等软件,构建出下颌骨正中联合部囊性病变三维有限元模型,分析在一定约束及载荷条件下病变区骨吸收与病理性骨折潜在风险之间的关系。结果:在计算机上建立了能够反映囊肿特征的有限元模型,功能载荷下正中联合部囊肿大小至38.18 mm×9.53 mm×23.49 mm时,应力集中区Von Mises应力值达到81.205 Mpa,接近骨性材料的屈服强度,此时舌、唇侧及下颌骨下缘临界骨厚度分别为1.33 mm、0.66 mm、1.69 mm。结论:当下颌骨正中联合部囊性病变区舌、唇侧及下颌骨下缘骨厚度阈值分别至1.33 mm、0.66 mm、1.69 mm时,从生物力学角度考虑颌骨强度因皮质骨大范围吸收而显著降低,此阈值可为制定Ⅰ期开窗减压联合Ⅱ期刮治术式提供一定的参考依据。

关键词: 下颌骨, 三维有限元, 囊性病变, 生物力学分析, 病理性骨折

Abstract: Objective: To establish a three-dimensional finite element model and to investigate the biomechanical characteristics and stress distribution of the cystic lesion in the mandibular central junction part. Methods: A three-dimensional finite element model with cystic lesions in the mandibular central junction part was constructed, based on the spiral CT scan data of a healthy adult female volunteer with normal occlusion relationship, using Mimics, Geomagic Studio, and other software. The relationship between bone resorption in the lesion area and potential risk of pathological fracture under certain constraints and loads was analyzed. Results: The finite element model that can reflect the characteristics of the cyst was established. When the size of the cyst in the mandibular central junction part reached 38.18 mm×9.53 mm×23.49 mm under functional load, the Von Mises value in the stress concentrated area reached 81.205 Mpa, which was close to the yield strength of bone materials, and the critical bone mass in the lingual side, the lip side, and the lower margin of the mandible were 1.33 mm, 0.66 mm, and 1.69 mm, respectively. Conclusion: From the perspective of biomechanics, the strength of jaw significantly reduced due to a wide range of absorption of cortical bone. The remaining bone thickness in the lingual side, lip side, and lower margin of mandible may provide a reference for the development of one-stage decompression combined with two-stage curettage surgical treatment.

Key words: mandible, three dimensional finite element analysis, cystic lesion, biomechanical analysis, pathological fracture