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수축형 및 확장형 FACE-BOW에 의한 상악 제1대구치 견인시 치근주위 응력분포에 대한 광탄성법적 분석
송관순,권오원 慶北大學校 齒科大學 1991 慶北齒大論文集 Vol.8 No.2
The purpose of this study was to investigate the effect of the Contraction and Expansion Face-Bows retraction of the maxillary first molars. The experimental models were made with the epoxy resin and the Face-Bows used in this study were standard type, contraction type and expansion type of the Ormco company. The maxillary first molars were retracted with each type of Face-Bow in the direction of straight pull and 500gm in total force. The obtained stress distributions around the roots were analysed by three dimensional photoelastic method. The results were as follows: 1. In the mesio-distal stress distribution, the maximum cervical stress of distal side of the Contraction and Expansion Face-Bows was approximately a half of the standard type case. 2. In the apical view, the ratio of the maximum stress distribution of the cervical one third is as follows: 1) In case of the standard type, distal and buccal maximum stress shows the ratio of 1 to 0.77. 2) In case of the contration type, distal and lingual maximum stress shows the ratio of 1 to 1.08. 3) In case of the expansion type, distal and lingual maximum stress shows the ratio of 1 to 1.46.
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