アブストラクト(29巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : 開閉口運動における下顎頭の回転および滑走運動に関する研究
Subtitle : 原著
Authors : 畠山夕子, 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 : 29
Number : 1
Page : 48-59
Year/Month : 1994 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 下顎の機能的な運動様相を知ることは, 生理的な咬合機能の完成を目指す歯科医学の分野では, 最も基本的な課題であり, 従来多くの研究者によりその運動様式が調べられている. 咀嚼や発音などにおける複雑な下顎の運動も, 下顎頭の基本的な動きとして観察すると, その回転運動と滑走運動によって微妙に調節されていることが知られている. しかし下顎頭の回転および滑走がどのようなバランスで発現し, また咬合の変化などにどのように対応しているのかといった問題については不明な点が多い. それらの運動に影響を及ぼす要因の1つとして咬合の不正が考えられ, この咬合の不正は顎関節の機能不全を引き起こすとともに, その機能不全を介して全身の健康にも重大な影響を及ぼす可能性が示唆されている. 歯科矯正学はこれら顎機能不全の原因となる咬合の不正を改善するとともに, 顎関節の機能に調和した咬合を完成することを目標としている.
Practice : 歯科学
Keywords : 開閉口運動, 滑走運動, 回転運動, 顎関節内障, 顎顔面骨格形態

English

Title : A Study of Condylar Rotation and Translation During Mandibular Opening and Closing Movement
Subtitle :
Authors : Yuko HATAKEYAMA, Yoshii Suzuki
Authors(kana) :
Organization : Department of Orthodontics, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 29
Number : 1
Page : 48-59
Year/Month : 1994 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Condylar movement consists of a combination of rotation and translation. These two basic movements cooperate with each other during opening and closing movements in normal occlusion. In this study, the harmony of rotation and translation in forty-three malocclusion subjects including temporomandibular joint dysfunction was examined by means of a computer aided diagnostic axiograph (CADIAX, Gamma Co.Ltd., Wien, Austria) system. Components of rotation and translation at each stage of condylar movement were calculated as percentages of maximum opening value. Results indicated that a harmony between condylar rotation and translation changed through the influence of TMJ dysfunction. Maximum rotation value (γmax) was smaller in locked joint subjects than in normal subjects while maximum translation value (Smax) was smaller in locked joint subjects and in malocclusion with normal condylar function than in normal subjects. That five combination patterns of condylar rotation and translation during opening and closing movements were found; straight type, concave type, convex type, over-rotation type and changing character type. A predominant appearance as observed i.e., the magnitude of rotation and translation of condylar movements was correlated with morphological characters of mandible. From these findings, it was suggested that the examination of rotation and translation movements of the condyle during opening and closing could (or might) provide important informations which would be pertinent to the diagnosis and functional analysis of malocclusions.
Practice : Dentistry
Keywords :