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Coordination of Tongue Pressure and Jaw Movement in Mastication

Division of Oromaxillofacial Regeneration, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita City, Osaka, 565-0871, Japan

View larger version (49K): [in a new window]   Figure 1. Location of pressure sensors and a constructed plate. (Ch.1) Position 5 mm posterior to the incisive papillae. (Ch.2) One-third anterior between incisive papillae and posterior edge of the palate. (Ch.3) One-third posterior between incisive papillae and posterior edge of the palate. (Ch.4) One-third anterior between incisive papillae and Hamuller’s notch on the habitual masticatory side. (Ch.5) One-third posterior between incisive papillae and Hamuller’s notch on the habitual masticatory side. (Ch.6) One-third anterior between incisive papillae and Hamuller’s notch on the non-habitual masticatory side. (Ch.7) One-third posterior between incisive papillae and Hamuller’s notch on the non-habitual masticatory side.

View larger version (36K): [in a new window]   Figure 2. A raw tracing of tongue pressure and vertical movement of the jaw in total sequence of recording (A), and a representative cycle in the late stage of mastication (B), from which coordination of the tongue and jaw movements was analyzed. In the raw tracing of vertical jaw movement (A), an elongation of the closing phase in the first cycle of the early stage and the last cycle of the late stage of mastication, and a decrease of jaw opening in the eighth cycle of the late stage of mastication were seen (arrows).

View larger version (21K): [in a new window]   Figure 3. The coordination between tongue pressure produced at each sensor and jaw movement during a stroke in the late stage of mastication in the time course where the beginning of the opening phase was set to 0 sec. The closing phase was not indicated, because tongue pressure did not synchronize with it.

View larger version (23K): [in a new window]   Figure 4. Mean values (± SDs) of duration of tongue pressure and maximum magnitude of tongue pressure at each sensor in the early stage and late stage of mastication of gummy jelly. *P < 0.05. Duration of tongue pressure in the late stage is longer than that in the early stage. Magnitude of tongue pressure in the late stage is larger than that in the early stage.