헤드기어를 이용한 상악 제1대구치의 후방이동 시 응력분포에 관한 광탄성법적 연구
A photoelastic evaluation of stress distribution during distal movement of upper molar
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초록
이 연구의 목적은 세 가지 형태의 헤드기어를 이용하여 상악 제1대구치의 후방이동 시 치아 주위 조직에 나타나는 응력분포를 광탄성법을 이용하여 관찰하는 것이다. 광탄성 상악모형에 장착한 헤드기어에 high-pull, straight-pull, cervical-pull의 세 가지 방향에서, face bow의 inner bow와 outer bow를 평행하게 한 상태에서 outer bow의 길이를 세 가지로 다르게 하여 적용시킨 다음 원편광기를 이용하여 응력분포를 분석하였다. 사진기를 이용하여 응력분포를 기록하고, 등색선상의 무늬차수를 이용, 응력분포를 분석하여 이차원적인 광탄성 응력분석을 시행하였다. 그 결과는 다음과 같다. 1. high-pull 헤드기어의 경우, 중간 길이의 outer bow일 때 치체이동에 유리한 응력 분포가 나타났다. 2. straight-pull 헤드기어의 경우, 긴 길이의 outer bow일 때 좀더 치체이동에 유리한 응력 분포가 나타났으나, outer bow의 길이에 따른 응력분포의 변화는 적었다. 3. cervical-pull 헤드기어의 경우, 긴 길이의 outer bow일 때 치체이동에 유리한 응력 분포가 나타났다. 임상에서 헤드기어를 이용하여 상악 제1대구치를 후방으로 치체이동시키기 위해서는 facebow outer bow의 높이를 조정하지 않는 경우에는 high-pull 헤드기어에서는 outer bow와 inner bow를 같은 길이로, straight-pull 및 cervical-pull 헤드기어에서는 outer bow를 더 길게 하여 사용하는 것이 추천된다.
Abstract
The purpose of this study was to photoelastically visualize the distribution of forces transmitted to the alveolus and surrounding structures using three different types of headgear for the distal movement of the upper molars. A photoelastic maxillary model was made and three different directional forces applied, which were high-pull, straight- pull, and cervical-pull. Stress distribution was recorded through circular polariscope, and two-dimensional photoelastic stress analysis was performed according to isochromatic fringe characteristics. The results were as follows: 1. In the case of high-pull headgear, bodily movement occurred in the medium-length outer bow, stress distribution in the apical region was 1st molar, 2nd premolar, 1st premolar in sequence and there was no apparent difference. 2. In the case of straight-pull headgear, bodily movement occurred in the long outer bow and stress distribution in the apical region was heavy in the 1st molar, 2nd premolar, 1st premolar in sequence. But, there were no apparent differences according to the length of the outer bow. 3. In the case of cervical-pull headgear, bodily movement also occurred in the long outer bow, and apical stress of the premolar region was heaviest among other cases and apical stress of the 2nd premolar was heaviest in the short outer bow. In clinical situations, to achieve bodily movement of the upper 1st molars without modifying outer bow height, applying an outer bow length as long as the inner bow length in high-pull headgear and applying an outer bow length longer than the inner bow length in straight-pull, cervical-pull headgear are recommended.
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