著者

牟田 龍生

出版者

九州歯科学会

雑誌

九州齒科學會雜誌 : Kyushu-Shika-Gakkai-zasshi (ISSN:03686833)

巻号頁・発行日

vol.28, no.5, pp.559-581, 1975-01-31

被引用文献数

3

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As a result of experimental bite raising on 7 adult and 7 young monkeys, the histological observation on "relapse" after retention period was undertaken with following findings. 1. The bite raising was achieved by inferior backward rotation of the mandible. Then, alveolar bone was stabilized by the masticatory muscles, which acted on the alveolar bone via teeth under the newly established occlusion. 2. Concerning muscle tissue, differences were evident between adult and young monkeys. That is, the muscle tissue of adult monkeys revealed severe regressive change during bite raising and retention period, but no severe change revealed in the muscle tissue of young monkeys. 3. The adaptation of muscle tissue was rather difficult than that of bone tissue. 4. The adaptation of bone tissue was earlier and stronger than that of muscle tissue. 5. Even in five days after the bite raising, alveolar bone, zygomatic arch, mandibular angle and temporomandibular joint revealed bone resorption. Through the retention, these bones developed osteoblastic mechanism and increased stabilization longitudinally. This trend was more active in young monkeys. Additionally, the muscle insertion parts of adult monkeys accompanied the bone transformation. From the above findings, it is considered to be the adaptation difficulty of the muscle tissue that "relapse" after bite raising is induced. Therefore, the author proposed that the orthodontic treatment, which required jaw transposition, should be done during growth period as much as possible. Although the adaptation of muscle tissue was difficult after growth period, the capability was not completely denied