A PHOTOELASTIC STUDY OF THE EFFECT OF LOOPS IN ARCH WIRE AND ORTHODONTIC ELASTICS IN RELIEF OF CURVE OF SPEE

호선에 부여한 loop와 교정용 고무가 치궁만곡도 개선에 미치는 영향에 관한 광탄성학적 연구

Multiloop Edgewise Archwire(MEAW) is effective in relief the Curve of Spee in mandibular arch but up Sl down orthodontic elastics must be used with it. The purpose of this study was to analyse the effect of orthodontic elastics, like as up & down elastics, Class II elastics, and Class III elastics, and the effect of L loop in Multioop Edgewise Archwire. 1. Intrusive force of MEAW in anterior teeth was reduced and uprighting force in premolars was increased by up & down elastics. 2. Uprighting force was significintly increased with Class III elastics in multiple L loop arch wire. 3. The force of Class II elastics made molars tip mesially and Curve of Spee deep.