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Characteristics of Mastication in the Anodontic Mouse

¹ Department of Oral Physiology, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565-0871, Japan;
² Clinical Laboratory, Osaka University Dental Hospital, Yamadaoka, Suita, Osaka 565-0871, Japan; and
³ Department of Oral Anatomy, Faculty of Dentistry, Hiroshima University, Hiroshima 734-8553, Japan;

View larger version (74K): [in this window] [in a new window]   Figure 1. The skull and hematoxylin-eosin staining of the stomatognathic structures of the normal (A,B,C) and op/op mouse (D,E,F). (A,D) The skulls of the normal and op/op mice. Note: A wide intermaxillary space occurs at the anterior part of the oral cavity, and an intermaxillary contact arises at the posterior part in the op/op mouse (D). (B,E) Hematoxylin-eosin staining of the stomatognathic structures at the frontal plane in the normal and op/op mice. (C,F) Molar tooth and the periodontal ligament. Though the molars are surrounded by periodontal ligament in the normal mouse (C, arrow), the molars in the op/op mouse are completely embedded in the alveolar bones and lack periodontal ligament around the tooth (F, arrow). The crown enamel has been removed by decalcification. Bars indicate 10 mm (A,D), 1 mm (B,E), and 200 µm (C,F). Al, alveolar bone; I, incisor; M, molar; and T, tongue.

View larger version (29K): [in this window] [in a new window]   Figure 2. Jaw movements and EMG activity in the masseteric and digastric muscles in mice feeding on paste balls. (A) Normal mouse feeding on paste balls. The masticatory sequence is divided into two stages: incision and chewing. (B) Jaw movements and EMG activity in the op/op mouse during paste feeding. The masseteric discharges were sometimes absent in the incision (arrowhead). (C) The area between the vertical dotted lines in (B) is shown on an expanded time base. (D) Averaged traces (10 cycles) synchronized to the peak point of the vertical jaw movement (vertical dotted line) in the op/op mouse. Hor, horizontal jaw movement; Ver, vertical jaw movement; Mass, EMG of the masseteric muscle; Dig, EMG of the digastric muscle; Ave Mass, averaged EMG of the masseteric muscle; Ave Dig, averaged EMG of the digastric muscle.

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