歯を水平的に移動させうる最小の力に関する組織学的研究
スポンサーリンク
概要
- 論文の詳細を見る
The most fundamental questions involved in discussing the effect of oral soft tissue pressure on tooth positioning, with the matters of the final tooth positioning and relapse after orthodontics treatment taken into consideration, are the degree of oral soft tissue pressure and a minimum force magnitude of tooth movement. Without clarifying these point, discussion on the relationship between the oral soft tissue pressure and the positioning of tooth will not be fruitful. Many studies have been reported on the magnitude of the oral soft tissue pressure. No report, however, has yet been made on histological investigation of a minimum force of tooth movement. The author, therefore, undertook a histological study on a minimum force of tooth movement, as a basic research leading to clalification of the relationship between the tooth positioning and the oral soft tissue pressure. For the experiment, three groups of monkeys, cynomolugus monkey, with three monkeys in each group, were used. Different pressures, 10g, 3g, and 1g, were applied on the lateral lowere first molar. The duration of the experiment were 14 days for 10g group and 3g group, and 21days for 1g group. In order to stabilize the pressure to be applied for the experiment, a fistular was bored in the cheek and the pressure was applied on the tooth through it extraoraly. Upon completion of the experiment, the monkeys were put to death. Undecalcified sections by plastic embedding with Methylenblue-Fuchsin staining and microradiograms of the sections were made and examined histologically to determine tooth movement. The results were as follows : 1. With the application for 14 days of the pressure of 10g or 3g, the lateral lower first molars of the subjects were caused to move. With the application of 1g even for 21 days, however, no tooth movement was observed. 2. Major histologic changes observed were : resorption of the alveolar bone, degeneration of the periodontal membrane, and proliferation of the young connective tissue. The type of bone resorption was a mingling of osteoclasia and osteolysis in the tension side only in the case of osteoclasia in the pressure side. 3. Histologic changes were most significant in the predicular region of teeth. The boundary and degree of the changes, however, varied with the magnitude of the force applied. 4. Active bone formation in the lateral side of the alveolar bone in the tension side, heretofore reported, was not observed in this experiment. Based on the foregoings, the experiment indicated a possibility that the soft tissue pressure such as of the lips, the cheeks and the tongues cause tooth movement.
- 九州歯科学会の論文
- 1977-05-31
著者
関連論文
- 50. 上顎前方牽引の効果について
- 52. 歯周疾患に罹患している歯に対する小矯正(第 39 回九州歯科学会総会講演抄録)
- 52 歯周疾患にり患している歯に対する小矯正 (Minor Tooth Movement)
- 当科における下顎前突症の外科的矯正治療 : 治療方針と症例報告
- 歯を水平的に移動させうる最小の力に関する組織学的研究 : 主論文の要旨
- 歯を水平的に移動させうる最小の力に関する組織学的研究
- 上顎前方牽引装置の効果について : とくに, F.K.O., chin cap との比較について
- 47. 悪習慣により生じた不正咬合の治験例(第 36 回九州歯科学会総会講演抄録)
- 30. 上顎前方牽引の効果について(第 2 報)(第 36 回九州歯科学会総会講演抄録)
- 26. 矯正装置を使用せずに主訴が改善された症例(一般講演抄録)