アブストラクト（55巻1号：神奈川歯学）

神奈川歯学

Japanese

Title　： 歯冠歯根統合モデルを用いた歯の移動の三次元解析 : 一塊遠心移動法による上顎臼歯部の評価
Subtitle　： 原著
Authors　： 北園優歩1), 小林優2), 不島健持1)
Authors（kana）　：
Organization　： 1)神奈川歯科大学大学院歯学研究科高度先進口腔医学講座歯科矯正学分野, 2)神奈川歯科大学大学院歯学研究科顎顔面病態診断治療学講座口腔外科学分野
Journal　： 神奈川歯学
Volume　： 55
Number　： 1
Page　： 16-28
Year/Month　： 2020 / 6
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 「緒言」三次元的な歯の移動の標準装置として, マルチブラケット装置が広く臨床応用されているが, 臼歯部の遠心移動を行う上でマルチブラケット法にはいくつかの欠点があると考えられる. 第一に, マルチブラケット装置は, ワイヤーとブラケットスロット間に一定の遊びが存在することにより, 側方歯の遠心傾斜を引き起こす. 側方歯がそれぞれ遠心傾斜することで, ワイヤーとブラケットスロット間の摩擦が大きくなり, 歯の移動効率を抑制する懸念がある. また, 遠心への傾斜移動は歯根膜の遠心歯頸部や近心根尖部などへの応力集中により硝子様変性を引き起こすと考えられ, 効率的な歯の移動を阻害する可能性がある. われわれは, 口蓋に適用する歯科矯正用アンカースクリューを併用し, 上顎臼歯部を一塊として遠心移動を行う新しい方法(一塊遠心移動法)を考案した.
Practice　： 歯科学
Keywords　： 遠心移動, 歯科矯正用アンカースクリュー, 統合モデル, 歯根の移動分析

English

Title　： Three-dimensional analyzing system of tooth movement by using crown-root integrated model : Assessment of en-masse distalization of the upper molars
Subtitle　：
Authors　： Yuho KITAZONO1), Masaru KOBAYASHI2), Kenji FUSHIMA1)
Authors（kana）　：
Organization　： 1)Division of Orthodontics, Department of Highly Advanced Stomatology, Graduate School of Dentistry, Kanagawa Dental University, 2)Division of Oral and Maxillofacial Surgery, Department of Dentomaxillofacial Diagnosis and Treatment, Graduate School of Dentistry, Kanagawa Dental University
Journal　： Kanagawa Shigaku
Volume　： 55
Number　： 1
Page　： 16-28
Year/Month　： 2020 / 6
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract] This study aimed to assess three-dimensional tooth movement using a reconstructed crown-root integrated model, in cases treated by the en-masse distalization of the upper molars. Eight female patients, aged 20 years and 9 months old on average, with Angle's Class II malocclusion participated in this study. They were treated by the en-masse distalization of the upper molars from the first premolar to the second molar, which were integrated as a grouped mass. At an initial recording, the upper molars were reconstructed using CT data, with digital models of the upper casts (DM-T1) being reconstructed from the 3D Scanner data. The crown area of each tooth of the CT model was replaced with the corresponding crown of the DM-T1. Consequently, the crown-root integrated models were reconstructed. At the recording after the en-masse distalization, digital models of the upper casts were reconstructed as DM-T2. Each crown-root integrated model was superimposed on the corresponding crown of the DM-T2. As a result, tooth movement was analyzed three-dimensionally. For the translation of the upper first molar, distal movement was, on average, 2.6 +- 0.8 mm at the crown and 2.3 +- 0.7 mm at the root apex. In the sagittal direction, the upper first molars showed an average distal tipping of 0.9 +- 4.0°. The integrated segment of the upper molars whole was rotated an average of 2.1 +- 3.1° posterior-superiorly in the sagittal plane and an average of 1.3 +- 2.3° posterior-laterally in the horizontal plane. Migration speed of the upper first molar at the crown and the root apex were an average of 0.3 mm/month and 0.2 mm/month, respectively. Through reconstructing a crown-root integrated model, a three-dimensional system for analyzing teeth movement was established. It was demonstrated that the en-masse distalization of the upper molars was by a bodily movement as a whole. The efficacy of the clinical application was suggested.
Practice　： Dentistry
Keywords　：