矯正力による歯牙移動が歯根形成中の隣在歯に与える影響に関する実験的研究
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概要
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The purpose of this study was to investigate the root formation of the tooth affected by orthodontic movement of the adjacent tooth. Thirty rabbits from ten to twelve weeks old were investigated histopathologically. Orthodontic elastic chain was used for the tooth movement, and the lower right 1st premolar was moved mesially with the anchorage of the left lower incisor. On setting the elastic chain, the crown of the lower right 2nd premolar was cut. Thirty rabbits were divided into two control groups (non-treated group and the 2nd premolar cut group) and two experimental groups (initial load approximately 50g and 200g groups). Each group had three rabbits. The experimental groups were investigated at the 2nd, 4th, 6th and 8th week after appliance setting during the experiment. Upon completion of the experiment, the changes occurring in the lower right premolars and molars and in the periodontal tissues were investigated histopathologically and compared with those of control groups. The results were as follows : 1. Physiologically, on the mesio-distal tooth movement in the control groups, the lower right 1st premolar moved mesially. The 2nd molar did not move mesio-distally and the lower molars moved distally. 2. As a result of applying force in the mesial direction to the crown of the lower right 1st premolar, the tooth moved and inclined mesially beyond the physiological limit. 3. In the 50g group, the lower right 2nd premolar and some of the 1st molar moved mesially and curved at the 4th week and thereafter after laoding. 4. In the 200g group, mesial movement and curvature of the lower right 2nd premolar occurred from the 2nd week after loading. Such changes in the 1st molar was observed at the 4th week after loading. At the 6th and the 8th week, neither mesial movement nor physiological distal movement of the 1st molar was observed. The above results histopathologically substantiate that an orthodontic tooth movement affects the development of the basal portion of the adjacent tooth. The results also suggest that clinical orthodontic tooth movement should be done with care in mixed dentition where many incompleted teeth exist.
- 九州歯科学会の論文
- 1989-02-25
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- 矯正力による歯牙移動が歯根形成中の隣在歯に与える影響に関する実験的研究 : 主論文の要旨
- 矯正力による歯牙移動が歯根形成中の隣在歯に与える影響に関する実験的研究