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目的:利用犬单侧下颌不完全截骨牵张成骨有限元模型,观察牵张侧颞下颌关节(髁突)位移状况。方法:利用有限元法模拟不完全截骨模型(截骨处剩1 mm舌侧皮质骨),观察一侧下颌骨滑动骨块未被牵开和被牵开时,牵张侧颞下颌关节2个标志点位移状况。结果:当滑动骨块未被牵开时牵张侧髁状突前斜面前缘中点、髁状突后斜面后缘中点均无位移;当滑动骨块被牵开l mm时,上述两点位移均有不同程度变化。结论:犬下颌单侧不全截骨牵张时,在内外(左右或X轴)方向上髁状突前斜面前缘中点具有向外运动的趋势,髁状突后斜面后缘中点具有向内运动的趋势,此变化不足以对颞下颌关节造成损伤。
OBJECTIVE: To investigate the displacement of temporomandibular joint (condyle) in distraction by using finite element model of incomplete unilateral osteotomy and osteogenesis of canine. Methods: The incomplete osteotomy model (1 mm lingual cortical bone left at the osteotomy) was simulated by finite element method. When the unilateral mandibular sliding bone was distracted and distracted, the distraction temporomandibular joint 2 A mark of displacement status. Results: When the sliding bone was not distracted, there was no displacement at the midpoint of the leading edge of the anterior oblique surface of the intervertebral mandibular condyle, and at the midpoint of the posterior edge of the posterior surface of the posterior condyle. When the sliding bone was distracted by 1 mm, Point displacement has varying degrees of change. CONCLUSIONS: When the unilateral dog’s unilateral osteotomy is distracted, the midpoint of the front edge of the anterior condyle of the dog’s mandible has an outward movement in the medial-lateral (left-right or X-axis) direction. The midpoint of the posterior edge of the posterior condyle has a Within the trend of movement, this change is not enough to cause damage to the temporomandibular joint.