Effects of increased occlusal vertical dimension on the jaw-opening reflex in adult rats |
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| Affiliation: | 1. Postgraduate Student, Department of Orthodontic Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan;2. Professor, Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan;3. Assistant Professor, Department of Orthodontic Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan;4. Assistant Professor, Department of Oral and Maxillofacial Surgery, Yokohama City University Graduate School of Medicine, Fukuura, Kanazawa-ku, Yokohama, Kanagawa, Japan;6. Professor, Department of Oral and Maxillofacial Surgery, Yokohama City University Medical Center, Urafunecho, Minami-ku, Yokohama, Kanagawa, Japan;5. Professor, Department of Orthodontic Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo-ku, Tokyo, Japan;1. Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan;2. Department of Forensic Medicine, Graduate School of Medicine, University of Tokyo, Tokyo, Japan;3. Department of Advanced Clinical Science and Therapeutics, Graduate School of Medicine, University of Tokyo, Tokyo, Japan;1. Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan;2. Department of Forensic Medicine, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;3. Department of Advanced Clinical Science and Therapeutics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;1. Tenured Lecturer, Prosthodontics, Department of Surgery, Faculty of Medicine, University of Salamanca, Salamanca, Spain;2. Associate Professor, Prosthodontics, Department of Surgery, Faculty of Medicine, University of Salamanca, Salamanca, Spain |
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| Abstract: | ObjectiveMalocclusion with deep overbite and facial esthetics improve when facial height is intentionally increased during orthodontic extrusion of the posterior teeth. Thus, a better understanding of post-treatment stability of increased occlusal vertical dimension (iOVD) in adult patients is important. We focused on the jaw-opening reflex (JOR), which plays an important role in the control of jaw movements during mastication, and investigated the effects of iOVD on the JOR in rats with an electrophysiological technique.DesignOne hundred and twenty 13-week-old male Wistar rats were randomly divided into control and experimental groups. Rats in the experimental group received a 2-mm buildup of composite resin on the maxillary molars at 13 weeks of age. The JOR was induced by low-intensity electrical stimulation of the left inferior alveolar nerve. The electromyographic responses were recorded from the digastric muscle at 13, 14, 15, 17, 19, and 23 weeks of age. JOR properties including latency, duration, and peak-to-peak amplitude were measured and compared between the groups.ResultsThe latency of the JOR was significantly longer and the peak-to-peak amplitude was significantly smaller in the experimental group than in the control group from 14 to 19 weeks of age, while the reflex duration was not significantly different. Intra-group comparisons of the latency and peak-to-peak amplitudes among rats 14–19 weeks of age were significantly different between the experimental group and the control group.ConclusionsiOVD affected the latency and amplitude of the JOR but not the duration. The JOR adapted after 10 weeks of iOVD. |
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| Keywords: | Jaw-opening reflex Rat Occlusal vertical dimension |
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