摘要
背景:关于下颌骨撞击后,下颌骨不同部位的骨折危险性的相关研究比较薄弱。目的:应用有限元方法分析下颌骨角部受瞬间外力作用下应力分布的情况和特点。方法:采用薄层CT扫描技术、医学影像三维重建软件Amira联合Unigraphics NX造型软件建立下颌骨三维模型。在Ansys软件中,于左侧下颌角区分别施以与矢状面垂直,平行的两个不同方向的1000N压力,获取受力后下颌骨应力分布状况和薄弱区域受力大小。结果与结论:建立了下颌骨有限元模型,当左侧下颌角受到水平向右垂直于矢状面的外力时,左右两侧的下颌角及髁状突颈部极易造成骨折,正中联合区域内侧面,左侧颏孔区可能会出现骨裂,而右侧颏孔区仅会造成轻微损伤。当左侧下颌角下缘受到垂直向上平行于矢状面的外力时,左右两侧的下颌角及髁状突颈部极易造成骨折,正中联合区域内侧面和左侧颏孔区可能会出现骨裂,而右侧颏孔区仅会轻微损伤。提示当下颌骨角部受到瞬间外力时,应力主要集中在下颌骨的薄弱区域,应力较大部位与骨折易发部位密切相关。且在薄弱区域中,两侧下颌角及髁状突颈部的损害最为严重。
BACKGROUND：The studies regarding fracture risk in different parts of the mandible after impact are few.OBJECTIVE：To study the condition and characteristics of stress distribution in the mandible,of which forces are applied on mandibular angle by using 3D finite element analysis.METHODS：The electronic CT images of mandible were scanned and then imported to the Amira software for the fabrication of 3D mandible model.At the angle of 90°,0° to the middle sagittal plane,1 000 N forces were applied on the left side of mandibular angle in Ansys software.Thereafter,the condition of stress distribution and Von Mises stress of the weak parts of the mandible were expressed in the 3D mandible model.RESULTS AND CONCLUSION：3D model of mandible was established.When force was applied on the left side of mandibular angle in 90° angle,both sides of mandibular angles and condylar necks were easily fractured.The inside surface of central symphysis and the left of mental foramen of mandible may show fissures,while the right of mental foramen was slightly damaged.When force was applied on the left side of inferior border of mandibular angle in 0° angle,both sides of mandibular angles and condylar necks were easily fractured.The inside of central symphysis and the left of mental foramen may showed fissures,while the right of mental foramen slightly damaged.It is revealed that,while forces were applied on the left side of mandibular angle,Von Mises stress mainly concentrated on the weak parts of mandible,which provides theoretical basis for preliminary clinical diagnosis and treatment of mandibular fractures.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2011年第9期1566-1569,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
基金
中央高校基本科研业务费专项资金(lzujbky-2010-142)~~
