アブストラクト（14巻3号：神奈川歯学）

神奈川歯学

Japanese

Title　： 顎外固定による矯正力の光弾性学的研究
Subtitle　： 原著
Authors　： 藤田晃
Authors（kana）　：
Organization　： 神奈川歯科大学矯正学教室
Journal　： 神奈川歯学
Volume　： 14
Number　： 3
Page　： 221-234
Year/Month　： 1979 / 12
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 「緒言」 弾性体の応力分布を知る方法はいくつかあるが, 光学的模型を用いてこれを可視的に検討するものに光弾性実験法がある. この実験方法の礎は1815年英国物理学者D.Brewsterによって築かれ, 1920年頃には英国の工学者E.G.Coker, L.N.Filonらによってその実用化が確立された. その後, 実験方法及びモデル材料の改良, 開発等が進んだ結果, それらは機械, 土木, 建築等多くの分野で盛んに応用され, 数々の貢献をしている. 医学における光弾性学の応用は, 1940年, Alexander及び, Milchらの整形外科での研究が先駆的のものであるとされている. それらは大腿骨の応力分布に関する実験であったが, これによって光弾性実験法の医学における応用の可能性が明らかにされた. 歯科医学においては, 医学の分野におけるよりも早く, 1935年にZakがはじめて光弾性実験法を導入して以来, 多岐にわたって利用されてきている.
Practice　： 歯科学
Keywords　：

English

Title　： Apstruct Photoelastic Study of the Force Occured by Cervical Traction
Subtitle　：
Authors　： Akira Fujita
Authors（kana）　：
Organization　： Department of Orthodontics, Kanagawa Dental College
Journal　： Kanagawa Shigaku
Volume　： 14
Number　： 3
Page　： 221-234
Year/Month　： 1979 / 12
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： On the occasion of the distal movement of upper molar using Kloehn type cervical headgear, orthodontists know only experientially that the length of outer bow and the angulation between outer bow and inner bow influence on the form of tooth movement. So, three dimentional photoelastic study was undertaken on the purpose of clarifying the form of the upper molar movement by using Kloehn type cervical headgear. The length of outer bow was short, medium and long ; angulation between the outer bow and inner bow was 0, 30, 60 degree upward respectively. Experimental model teeth were constructed with ARALDITE CT-200 and HT-901. These experimental teeth were embedded into the concrete. After loading orthodontically and freesing the stress, the sample teeth were sliced in 3 mm. thickness. FUSO's stress analyzer was used in order to assess the distribution of orthodontic stress caused by cervical traction. Results were as follows : (1) The form of tooth movement was able to be controled by changing the length of outer bow and the angulation between outer bow and inner bow. (2) Mesial crown torque of upper molar tooth was increased by shortening the length of outer bow. (3) Bodily movement of upper molar was possible when the length of outer bow was short. (4) Upper molar tooth thave tend to tip distally when the angulation between outer bow and inner bow was O degree. This tendency was remarkable especially when the length of outer bow was short. In consequence, it was suggested that the length of outer bow and the angulation between outer bow and inner bow have to be adjusted according to the form of tooth movement intended, especially, when using kloehn type cervical traction gear. Orthodontic treatment mainly includes the tooth movement or the tooth loading. Therefore, it is indispensable problem for the orthodontics that the relation between orthodontic force and bone response are made clear. So, this three dimentional photoelastic study seemed to be useful to analyze the orthodontic stresses.
Practice　： Dentistry
Keywords　：