PURPOSE To assess function by identifying changes in swallowing and masticatory performance in maxillary obturator prosthesis wearers. MATERIALS AND METHODS Sixty subjects were recruited for the study, of which 20 were obturator wearers, 20 were completely dentulous and 20 had removable partial/complete dentures with similar Eichner's Index. Swallowing ability was evaluated with and without o...

Objective. The aim of this study was to assess the relationship between subjective oral health status and lifestyle in elderly people living in Japan. Methods. Subjects were 5383 inhabitants of the Kagawa Prefecture, Japan, at the age of 75-100. Records of the number of remaining teeth and the data from self-reported questionnaire were analyzed statistically. Results. Remaining teeth were signi...

The relationship between the physical properties of solid food and the masticatory parameters is clarified. Eight solid foods of varying physical properties were chosen. Electromyography of the jaw-closing muscles and mandibular kinematics in eleven young subjects were recorded. The masticatory parameters were derived from the recorded data for the entire mastication process, for the first bite...

Purpose To describe and compare the temporal-spatial kinematic variables of mandibular movement during deliberate unilateral and habitual mastication in healthy young-adult individuals. Methods The study sample was composed of eight male healthy volunteers aged 19 to 24 years. The kinematic data were obtained using a motion analysis system - Qualisys Track Manager (QTM) ProReflex MCU. Recordi...

An EMG computer analysis system was developed to analyze the mandibular function. The system enabled measurements of the masticatory muscle's rhythm, activity, and power spectrum for the same EMG burst during mastication. This study revealed that a power spectrum analysis was able to be carried out by a fast Fourier transform algorithm of the isometric contraction components of EMG bursts durin...

To examine the relationships between masticatory force, electromyogram (EMG) of masticatory muscles, and jaw movement pattern, we quantitatively evaluated the effects of changing hardness of a chewing substance on these three variables. Cortically induced rhythmic jaw movements of a crescent-shaped pattern were induced by electrical stimulation of the cerebral cortical masticatory area in the a...

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われわれヒトを含めて哺乳類の身体は,皮 膚 に よって外部環境から隔てられた 個体 を形成 してお り,皮 膚にある外受容器 と眼,耳,鼻 にある遠隔 受容器によって外部環境の変化 を刺激 として受容 し,そ れに対する反応 として行動 を起す。この行 動は骨格筋の収縮によって実現 されるもので,外 部環境に対する個体 としての反応は,身 体内部の 筋,腱,迷 路にある固有受容器に対する刺激 とな り,こ れ らの受容器から身体の運動 と位置に関す る情報が中枢に送 られる(Sherrington1947)91)。 筋紡錘および腱紡錘は筋 と腱に存在する代表的な 固有受容器であり,こ れ らからの情報によって, 運動の円滑な遂行が反射性に制御 されていること が,多 数の研究者によって 明らかに されて いる (Matthews196463),Granit197027),Matthe...

Discovering hidden features in a representation without being fixated to a single perspective of viewing it is one of the crucial acts in creative activities. The process of designing through conceptual sketches is no exception; designers should be able to discover in an unexpected way visual/spatial features of sketched elements which were not intended when the elements were being sketched. Ho...