摘要
目的 研究不同的加载方式及不同的咬合部位对下颌骨 ,特别是下颌角区域应力分布的影响。方法通过建立下颌骨的机械力学模型 ,采用电阻应变片的测量方法 ,分析不同加载方式 (咬肌加载 ,颞肌加载及咬肌、颞肌、翼内肌和翼外肌四组肌肉同时加载 )以及不同咬合状态 (前牙咬合及单、双侧后牙咬合 )对下颌骨应力分布的影响。结果 在不同的加载方式的比较中 ,咬肌单独加载时 ,下颌角区域的应变明显 (上缘 1 2 1με、1 2 5με,下缘 - 6 9με、- 4 5με) ;颞肌单独加载时 ,下颌升支前缘应变明显 (2 6 9με、375με) ;四组肌肉同时加载时 ,颏部的应力性质发生改变。在不同咬合部位的比较中 ,在四组肌肉同时加载的条件下 ,前牙咬合加载时下颌角区域的应力值大于双侧后牙咬合加载 ;单侧后牙咬合时 ,咬合侧下颌角区域的应力趋势发生变化。
Objective To study the stress distribution of intact mandible, especially that of the mandibular angle under different muscle loading and biting condition. Methods Develop a more accurate, more objective mandibular model, measure the different stress patterns on the outer surface of the mandible by strain gauges due to different biting sites (INC and ICP) and different loading methods(masseter, temporalis and four pairs of muscles).Results It was found that the strain in the zone of mandibular angle is more markedly under masseter loading; that the strain in the zone of anterior mandibular ramus is more markedly under temporalis loading; and that the stress in the zone of mentum becomes a tension because of the medial pterygoid under the load of four pairs of muscles. During anterior teeth biting, the stress of mandible angle is larger than that of the bilateral molar biting. When an occlusal load is on the ipsilateral molars, there is a reversal result of the stress direction in the upper line of the mandibular angle. Conclusion Different muscular loading and biting condition can change the stress distribution of the mandible. It is important to develop a functional model of human mandible to study its complex biomechanics behavior.
出处
《四川大学学报（医学版）》
CAS
CSCD
北大核心
2004年第4期516-519,共4页
Journal of Sichuan University(Medical Sciences)
关键词
下颌骨
生物力学
加载方式
Mandible Biomechanics Loading condition
