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目的:利用犬下颌单侧不全截骨牵张成骨有限元模型,观察牵张侧和非牵张侧在牵张过程中的位移趋势。方法:模拟犬下颌单侧不全截骨牵张成骨,一侧下颌骨滑动骨块受力被牵开1mm,观察牵张侧和非牵张侧各标志点的位移趋势。结果:获得牵张侧和非牵张侧各6个标志点的空间X、Y、Z三轴位移数据,对比显示两组数据在X、Y轴差别较大。结论:非牵张侧下颌骨有些标志点的变化与牵张侧相比,在内外(左右或X轴)侧方向上,下颌角点、髁突后斜面后缘中点的运动趋势不是背离对侧下颌骨,而是向着牵引侧下颌骨运动;在前后轴(Y轴)方向上,第五臼齿、髁突前斜面前缘中点的运动趋势是向前而不是向后的,但运动幅度较喙突、下颌角小很多。
OBJECTIVE: To investigate the displacement trend of distraction and non-distraction with distraction osteogenesis of canine mandibular unilateral osteotomy by finite element method. Methods: The canine unilateral osteogonally distraction osteogenesis of the canine was simulated. The stress of the sliding bone of the mandible was retracted 1mm, and the displacement trend of each marked point of the distraction and non-distraction sides was observed. Results: The displacement data of X, Y and Z in the space of 6 markers on the distraction side and the non-distraction side were obtained. The comparison shows that the data of the two groups differ greatly in the X and Y axes. CONCLUSIONS: The changes of some markers in non-distraction mandibular tendons are not deviated from the mid-lateral (left or right or X-axis) lateral and mandibular angle points and the posterior condyle posterior edge midpoint But in the direction of the Y axis, the movement trend of the fifth molar and the midpoint of the anterior condyle of the condyle is forward rather than backward. However, the amplitude of the movement More coracoid, mandibular angle much smaller.