摘要
通过对两种腭裂上颌骨模型的加力分析,研究牙槽突植骨手术对腭裂上颌骨模型的生物力学影响。我们采用17岁男性患者头颅CT扫描图像数据建立腭裂上颌骨三维有限元模型,通过叠加植骨块模型形成牙槽突植骨修复后的腭裂上颌骨模型。在上颌骨前端以正常上唇压力数值水平向后加载压力,观察压应力沿上颌骨分布的特点和剪应力及拉应力出现的位置。结果显示,压应力主要沿牙槽突分布,并形成数个应力集中区。植骨后,应力分布趋向均匀化。植骨可以降低由于上颌骨变形而产生的剪应力和牙槽突的向内移位。我们认为,唇裂修复手术后产生的压力可能是使牙槽突产生变形移位的主要原因,压应力沿着牙槽突骨弓传导可能使牙列畸形加重。牙槽突植骨修复可以使应力分布趋向均匀,但是不改变应力的分布特征。
To investigate the blomechanical influences on two different cleft maxillary 3D finite element models pre- and post-alveolar bone graft, we developed a cleft palate bony model from a 17 year cleft palate male CT scan data and built an alveolar bone-grafted cleft maxillary 3D finite element model through gluing the graft model. Apply vector lip force on the anterior face of the models. Study the press （including S3 principal, S1 principal,yon Mises and shear） distribution properties and localized area. The results suggested that the press principal spreads along the alveolar ridge and formed several focused areas. After bone grafted, the shear stress tends to be evenly. The grafted alveolar could resist the medially deformation of alveolar crest and the shear stress to the nasal base bony structure. The conclusions from results demonstrated that the deformation of alveolar ridge is possibly due to the lip pressure after the lip repair. The shear stress along the alveolar ridge could cause the severity of the dentition. The grafted bony structure could even the shear stress distribution evenly other than the distribution properties.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2006年第6期1253-1257,共5页
Journal of Biomedical Engineering
基金
高等学校优秀青年教师教学和科研奖励基金资助项目(1999)
陕西省科技攻关项目资助(2002K10-G8(7))
关键词
腭裂
上颌骨有限元模型
牙槽突
植骨
Cleft palate Maxillary finite element model Alveolar crest Bone graft
