A BIOMECHANICAL ANALYSIS OF DEFORMATION AND STRAIN ON LOWER JAW MODEL

Forces, occurring as result of orthodontic appliances, present a guidi ng system which controls force activity during the growth and developm ent of lower jaw. By qualitative photoelasticimetric analysis author d ecided to evaluate the influence of extension apparatus to the lower j aw. The concentration and stress distribution, intensity and force dir ection on, contacts with insert (extensor device) were analysed. on ar aldyte lower jaw models. Three different loadings 41.0, 57.4 and 73.8 N under four different loading conditions with and without the correct ion appliance were used. The results of investigation indicated that t he force created by the orthodontic appliance is correct at the beginn ing. The change from surface contact to linear and punctual contact in creased the static moment and local stress, resulting in new regional conditions.