アブストラクト（27巻4号：神奈川歯学）

神奈川歯学

Japanese

Title　： 下顎開閉口運動時の下顎頭の限界運動による不正咬合の性格づけに関する研究 - 正常咬合者および上顎前突者, 下顎前突者の比較 -
Subtitle　： 原著
Authors　： 村居聖子, 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　： 27
Number　： 4
Page　： 465-479
Year/Month　： 1993 / 3
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 「緒言」咬合の不正は, 単に上下顎歯の対咬関係の異常や, 歯に加わる咬合力の不適を招来するばかりでなく, 運動器官としての下顎骨の機能に影響し, 関節の機能不全や顎顔面頭蓋の姿勢や成長発育, ひいては全身の健康にも重大な影響を及ぼすことが示唆されている. 歯科矯正学においては, これらの原因となっている咬合の不正を改善するとともに, 正常な下顎の機能を回復し, 各個体毎の正常咬合を完成することを治療目標としている. しかし, 咬合の異常と顎顔面骨格の機能, とりわけ, 関節の運動機能との関連性については不明な点が多いため, 実際に矯正治療を進める上での具体的な指針がないのが現状と思われる. 一方, 近年, 咬合不正といわゆる顎関節症発現との関連性が重視され, その解明が歯科臨床における最も重要な課題のひとつとなっている. いわゆる顎関節症は咬合の不正ばかりでなく, 筋肉の不調和や精神的ストレスなど多くの原因によって発症する顎関節の機能不全症であると考えられる.
Practice　： 歯科学
Keywords　： 開閉口運動, 回転運動, 滑走運動不正咬合

English

Title　： A Study of the Rotatory and Translatory Components of Condylar Movement in the Normal and Malocclusion Subjects
Subtitle　：
Authors　： Seiko MURAI, Yoshii Suzuki
Authors（kana）　：
Organization　： Department of Orthodontics Kanagawa Dental College
Journal　： Kanagawa Shigaku
Volume　： 27
Number　： 4
Page　： 465-479
Year/Month　： 1993 / 3
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： Abstract : Functional mandibular movements consist of a combination of condylar rotation and translation and are regulated by the function of the masticatory muscles. The relationship between these two basic components of condylar border movement was studied during opening and closing movement in 14 normal occlusion subjects without any signs of temporomandibular joint dysfunction. In addition to the normal occlusion subject, 7 Class II and 10 Class III subjects with no signs of TMJ dysfunction were also examined. Condylar movements were recorded by means of a computer aided diagnostic axiograph(CADIAX)sy tem as described by E.Phiehslinger(1991). Translation and rotation components at each stage of condylar movement were calculated as a percentages of maximum opening value. Results indicated a highly linear relationship between condylar rotation and anterior translation during opening and closing in normal occlusion subjects, although in some cases, a predominant appearance of translation movement in initial and final stages of condylar movement were observed. The same linear relationship was found in Class II and Class III subjects while there were some exceptions of which the predominance of translation at the initial stage of opening movement in Class II subjects, and the predominance of rotation at the final stage of closing movement in Class III subjects. Maximum translation value(Smax)was smaller in Class III subjects, than those in normal and Class II subjects, while there was no significant difference in the values of maximum rotation(γmax). It was found that the magnitude of translation and rotation of condylar movement was correlated with morphological characters of the mandibule, particularly the mandibular length rather than the vertical height of the ramus. From these findings, it was suggested that the examination of translation and rotation movements of the condyle during opening and closing can provide important information which are pertinent to the diagnosis and functional analysis of malocclusions.
Practice　： Dentistry
Keywords　：