Investigation of tooth movement by super-elastic force

该研究项目的每一项都得到了实施。1、材料的研究通过热处理，可以用单根丝改变力的大小。用该丝制作弓丝和螺旋弹簧，进行组织学和生理学研究。利用DERHT方法<electric current is passed directly through wire itself>可以实现弯拱协调。在生物动力学研究的拱型中，拱型协调的方法是通过炉热处理来实现的。2、生物动力学研究正畸弓丝的形态可以参照正常牙合的形态，在临床上应用时，弓丝的形态可以参照正常牙合的形态。通过三维有限元分析，研究了牙弓和下颌骨的应力分布。研究结果对正畸弓丝的设计具有一定的指导意义。3、神经生理学研究研究本实验研究了支配牙周膜和口腔粘膜的单个感觉单位对超弹性力的反应特性。这些单位的脉冲频率与刺激强度和速度的检测有关。4、组织学研究研究狗的牙齿运动（在体）进行了研究，并观察了组织学变化。牙周组织改建活跃、正常，对机体损伤小。

Each item of this research project was performed. Results was concluded as follows:1> Study of material By heat treatment, changing the force level with a single wire can be done. Arch wires and coil springs were fabiecated by this wire for histological or physiological studies. By DERHT method <electric current is passed directly through wire itself>, bending and arch coordination can be done. About the arch which was investigated by bio-dynamic study, the way of arch coordination was originated by furnace hear treatment. Thus wire control in details can be done, which was very difficult in chair-side direct way.2> Study of bio-dynamics The shape of the arch wire in orthodontic use may be based on that of normal occlusion. Stress distribution was investigated by three dimensional finite about the arch and mandible. The result was useful for design of orthodontic arch wire.3> Study of neuro-physiology Response properties of single sensory units innervating human periodontal ligament and oral mucosa to super-elastic force were investigated. the impulse frequency of these units related to the detection of the stimulus magnitude and velocity.4> study of histology Teeth movements of dogs(in vivo) were investigated and histological change were observed. The remodeling of periodontal tissue was active and normal, and the damage to body was little.