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アブストラクト（24巻4号：神奈川歯学）
Japanese
| Title ： | 矯正的歯の移動に伴う有髄歯と根充歯の根吸収 |
|---|---|
| Subtitle ： | 原著 |
| Authors ： | 佐藤巌, 鈴木祥井 |
| Authors（kana） ： | |
| Organization ： | 神奈川歯科大学矯正学教室 |
| Journal ： | 神奈川歯学 |
| Volume ： | 24 |
| Number ： | 4 |
| Page ： | 601-617 |
| Year/Month ： | 1990 / 3 |
| Article ： | 原著 |
| Publisher ： | 神奈川歯科大学学会 |
| Abstract ： | 「緒言」 歯科矯正治療による正常な咬合への誘導は種々のメリットを含むが, その一方で歯根の吸収というきわめて都合の悪い現象を伴うことがある. McLanghlimによれば, 歯根吸収は矯正治療の既往があったほとんどの歯に認められる, とされている. 歯根吸収には, 生じても第二セメント質で修復されてしまう一時的なものから, 歯根の半分近くを失うに至る高度なものまで種々な程度のものがある. これらの程度と矯正力の適用条件との関連はいまだ解明されていない. 年齢や性差, 食性, 歯周疾患, 外傷など, 経験的にも指摘される要因が少なからず存在するが, これらは推測の域を出ない. 近年, 矯正治療の範囲が拡大され, いわゆる成人矯正もよくおこなわれるようになった. 成人は, 当然のことながら, 小児に比べて組織の活性が低下していて, 矯正力に対する反応も異なる. さらに, 増齢的に歯髄処置が施された歯も増加する. |
| Practice ： | 歯科学 |
| Keywords ： | 有髄歯, 根充歯, 根吸収, 歯の移動, セメント質 |
English
| Title ： | Root Resorption of Vital and Endodontically Treated Teeth in Orthodontic Movement |
|---|---|
| Subtitle ： | |
| Authors ： | Iwao SATOH, Yoshii Suzuki |
| Authors（kana） ： | |
| Organization ： | Department of Orthodontics Kanagawa Dental College |
| Journal ： | Kanagawa Shigaku |
| Volume ： | 24 |
| Number ： | 4 |
| Page ： | 601-617 |
| Year/Month ： | 1990 / 3 |
| Article ： | Original article |
| Publisher ： | Kanagawa Odontological Society |
| Abstract ： | [Abstract]: Orthodontic tooth movement frequently induces the resorption of the tooth root, although valuable information concerning the relationship between the root resorption and force magnitude, duration and types of tooth movement and the condition of periodontium obtained. However, it is incompletely known that the situation of candidated tooth itself of orthodontic movement in which pulpectomized non-vital condition influence the process of root resorption and subsequent repairing. Thus, the study was conducted to clarify the effect by the pulpectomy accompanied with tooth movement on the process of root resorption and regeneration of periodontium. A hundred and fifty Wister rats, weight 180～200g, 6 weeks old, were used as experimental animals. Prior to experimental tooth movement, first molars of 50 rats were recived pulpectomy on both sides followed by filling of root cannal (first group) and those of another 50 rats on single side (second group). Maxillary first molars of the other 50 rats were saved as a vital dental pulp control (third group). The first and the third groups of animals were then subjected to experimental tooth movement with the interproximal insertion of elastic rubber as described by Waldo (1953) for 3days, 1, 2, 3 and 4weeks. After tooth movement was terminated, animals were sacrificed by ether inhalation or by perfusion of glutaraldehyde fixation solution. The upper jaw from each rat was dissected and prepared specimens for non-decalcified section and light microscopic section. Root resorption and regeneration of cementum were evaluated quantitatively using the modular system for semiautomatic quantitative evaluation of images on the light microscopic section. Occurence of external root resorption with multinucleated odontoclast associated with experimental tooth movement in pulpectomized tooth were lesser and later than those of vital teeth. these findings suggest that the dental pulp plays an important role in the processes of root resorption and remodeling of cementum associated with orthodontic tooth movement. |
| Practice ： | Dentistry |
| Keywords ： |
