アブストラクト(24巻2号:神奈川歯学)

神奈川歯学

Japanese

Title : 咀嚼運動における咬頭嵌合位付近経路の客観的評価方法の試みについて
Subtitle : 原著
Authors : 玉置勝司, 兼松恭規, 服部善崇, 遠藤ゆかり, 渡辺英男, 山村雅章, 藤田忠寛, 青木英夫
Authors(kana) :
Organization : 神奈川歯科大学補綴学教室第三講座
Journal : 神奈川歯学
Volume : 24
Number : 2
Page : 404-411
Year/Month : 1989 / 9
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」咬合の診断は, 上下顎の歯列模型から得られる静的情報のみならず, 顎口腔系における下顎の機能的情報からもあわせて評価することが重要である. 下顎運動に関しては, 従来より多くの研究者によって報告されているが, なかでも咀嚼運動は歯牙, 咀嚼筋および顎関節などの顎口腔系諸器官と上位中枢との協調動作によって営まれるリズミカルな反射運動で, 下顎の最も生理的な機能運動と考えられている. したがって, 咀嚼運動は顎口腔系の機能を把握する対象運動として注目され, 種々の方面から検討されている. とりわけ, 咬頭嵌合位付近の運動については, 咬合と密接に関連するということで古くより関心が持たれ, 歯牙の接触滑走の有無や咬頭傾斜角度との関連性などの点から詳細に報告されている. また, 歯牙(歯根膜)を圧迫する方向によって, フィードバックされる反射パターンに違いが生じるという生理学的な見地からも, 咬頭嵌合位付近は咬合要素の影響を反映した臨床的に診断価値の高い運動経路の一つであると考えられる.
Practice : 歯科学
Keywords : 咀嚼運動, 開・閉口経路, 咬頭嵌合位付近, 等確率偏差楕円

English

Title : A Study of Objective Assessment for Pathways in Areas of Intercuspal Position during Masticatory Movements
Subtitle : Original article
Authors : Katsushi TAMAKI, Kiyonori KANEMATSU, Yoshitaka HATTORI, Yukari ENDO, Hideo WATANABE, Masaaki YAMAMURA, Tadahiro FUJITA, Hideo AOKI
Authors(kana) :
Organization : Department of Crown & Bridge Prosthodontics, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 24
Number : 2
Page : 404-411
Year/Month : 1989 / 9
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : Masicatoy function is the result of a highly complicated neuromuscular activity which coordinates in stomatognathie system. Functional directions of masticatory cyeles in areas of intercuspal position (IP) were objectively evaluated on each stroke obtained through the Sirognathograph Analyzing System (S.G.G. / A.S. ; Siemens,W. Germany). Twenty seven dantate subjects were selected at random from students and staff members of Kanagawa Dental College. A piece of chewing gum was given to each subject to masticate it for a minute on one side and on the other side respectively. A total of masticatory cycles were successively recorded into S.G.G. / A.S.. A statistical analysis, the equal probability for ellipstical variations, was made on the angular measurements from opening and closing phases of each cycle within 3mm from onset and terminus in areas of IP during masticatory movements. Four characteristic features of angular measurements are presented in Fig. 4 to 7, namely, subjects who showed different types in position and forms by plotted angles within 80% of total amounts. The following results were obtained from this study. 1. Functional directions of masticatory cycles are clearly recognized in areas of IP from opening and closing phases during masticatory movements. 2. An application of the equal probability for ellipstical variations seems to be efficient for the functional analysis of masticatory cycles. 3. A classification of different types of plotted angles contributes to become a basis for diagnosis of masticatory function and occlusion.
Practice : Dentistry
Keywords :