Biomechanical study of the maxillofacial complex in the treatment of Cleft lip and palate.

采用三维有限元方法对单侧唇腭裂术后颌面部复合体及其力学行为进行了分析。这项研究检查了7至15岁的患病儿童和对照儿童的横截面数据集。在建立有限元模型之前，观察骨密度测量及其三维分布。将CT扫描的数据送入计算机图形系统，然后用多个病人的三维结构和密度值作为几何信息。在三维和矩形有限元上对个体牙颌面骨骼进行描述。这种有限元方法的优点是评估不依赖于所选择的参考平面，例如头影测量，并且实现了各种治疗技术所产生的力学环境。从分析结果可以看出，疤痕组织在上颌骨远端表面产生了应力，并进行了酶谱分析。此外，在磨牙上方的上颌颊面上还观察到了侧向扩张和上颌前牵引产生的应力。然而，在一些患者身上观察到了轻微的差异。这些结果表明，腭裂修复术后的剧烈变形和治疗效果与颌面部骨骼的骨结构和力学性能有关。

The maxillofacial complex and its mechanical behavior in unilateral cleft lip and palate (UCLP) after palatoplasty was analyzed with the three-dimensional finite element method (FEM) . The study examined cross-sectional date sets of affected and control aged 7 to 15 years. Bone density measurement and its three-dimensional distribution was observed beforehand of FE modeling. The data from CT scanning was fed into computer graphic system and then the three-dimensional structure and density value were used as the geometrical information from several patient. Individual dento-maxillofacial skeleton was described on the three-dimensional and rectangular finite elements. The advantage of this FEM is that the evaluations are not dependent on the selected reference plane such as Cephalometrics and mechanical environment derived from various treatment technique is realized. From the analytical results, stress generated by the scar tissue was observed on the distal surface of maxilla and zyogomatics. Also stress generated by lateral expansion and maxillary protraction was observed on the buccal surface of maxilla above the molars. However, slight differences were observed on several patients. These findings suggested that the dramatic deformation associated with palatoplasty and the effect of treatment were related to the bone structure and mechanical properties in maxillofacial skeletons.