Wen Yi-Xi, Shi Bing, Yang Zhuang-Qun
Key Laboratory of Oral Biomedical Engineering Ministry of Education, Sichuan University, Chengdu 610041, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2006 Apr;24(2):117-20.
To investigate the biomechanical force distribution of three different cleft maxillary finite-element models pre- and post-bone graft with specified load to certain area of the models.
Developing a cleft palate bony model from a 15-year cleft palate male CT scan DICOM data and generating alveolar bone-grafted, alveolopalatal bone-grafted cleft maxillary finite-element model was set up through gluing the graft model. Also the pre-grafted model as compared, vector lip force on the anterior and anteriolateral face of the alveolar ridge was applied, and studied the press distribution properties and localized area.
The press principal spread along the alveolar ridge and focused on anterior wall of maxillary prior to graft. But the press tended to be evenly distributed after bone grafted, whether alveolar or/and hard palate bone grafted. The grafted bone could resisted the medially deformation of alveolar crest and decreased the shear press to the nasal base bony structure. The map showed no significant differences along with alveolar or/and hard palate bone graft.
The postoperative lip pressure plays an important role for the deformation and deviation of alveolar ridge. Alveolar bone graft could even the distribution of the stresses and should be emphasized. But the grafted bony palatal appears superior to but no significant mapping and anti-deformation difference with alveolar bone graft.
研究三种不同的腭裂上颌骨有限元模型在植骨前后对模型特定区域施加指定载荷时的生物力学力分布情况。
从一名15岁男性腭裂患者的CT扫描DICOM数据中构建腭裂骨模型，通过粘贴移植模型建立牙槽骨移植、牙槽腭骨移植的腭裂上颌骨有限元模型。同时对比移植前模型，在牙槽嵴的前表面和前外侧表面施加矢量唇力，研究压力分布特性和局部区域。
移植前压力主要沿牙槽嵴分布并集中在上颌前壁。但植骨后，无论是牙槽骨移植还是/和硬腭骨移植，压力趋于均匀分布。移植骨可抵抗牙槽嵴的内侧变形，并降低对鼻底骨结构的剪切压力。图谱显示牙槽骨移植和/或硬腭骨移植之间无显著差异。
术后唇压力对牙槽嵴的变形和偏移起重要作用。牙槽骨移植可使应力分布均匀，应予以重视。但移植的硬腭骨在图谱和抗变形方面优于牙槽骨移植，但无显著差异。
