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New Animal Model for Studying Mastication in Oral Motor Disorders

¹ Division of Oral Physiology,
² Removable Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, 5274, Gakkocho-dori 2, Niigata 951-8514, Japan; and
³ Division of Orthodontics and Biomedical Engineering, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1, Sakamoto, Nagasaki 852-8588, Japan;

View larger version (60K): [in a new window]   Figure 1. A typical masticatory sequence of a freely behaving mouse chewing chow pellets. Vertical (Vert), horizontal (Horz), and antero-posterior (A-P) components of the jaw movement are shown in a time sequence synchronized with the left masseter (LMAS), right masseter (RMAS), and right digastric (RDIG) electromyograms. At the bottom, jaw movement trajectories were reconstructed in the sagittal plane during food intake, chewing, and the next food intake. Arrows above three traces indicate the time period for each drawing.

View larger version (23K): [in a new window]   Figure 2. Movement orbits of five successive chewing cycles in the frontal and sagittal planes when a mouse was fed chow pellets (upper) and bread (lower). The three strokes in a chewing cycle are evident in the sagittal view.

View larger version (19K): [in a new window]   Figure 3. Precise relationships between jaw movements and masticatory muscle activities during the chewing of pellets (A) and bread (B). From top to bottom, the traces show vertical (Vert), horizontal (Horz), and antero-posterior (A-P) components of the jaw movement, and rectified and smoothed electromyogram activities of the left masseter (LMAS: thick dotted line), right masseter (RMAS: thick line), and right digastric (RDIG: thin dotted line) muscles.