Investigation of tooth movement by super-elastic force

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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.