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An Involvement of Trigeminal Mesencephalic Neurons in Regulation of Occlusal Vertical Dimension in the Guinea Pig

¹ Department of Oral Physiology,
² Department of Fixed Prothodontics,
³ Department of Oral Anatomy,
⁴ Department of Removal Prothodontics,
⁵ Department of Orthodontics, and
⁶ Department of Oral Radiology, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565-0871, Japan;
⁷ Department of Oral Physiology, Comprehensive Dental Research Laboratory, Matsumoto Dental University, Shiojiri, Nagano 399-0781, Japan;

View larger version (85K): [in a new window]   Figure 1. Cephalometric radiograph (A) and landmarks on the trace of it (B).

View larger version (21K): [in a new window]   Figure 2. An example of an extracellular unit recording from a MesV neuron. (A) The neuronal responses to ramp stretch. The uppermost and second traces indicate the single-unit activity and firing rate, respectively. The bottom trace shows the vertical jaw movement. (B) The neuronal responses to palpation to the masseter muscle. The MesV neuron responds to gentle palpations to the masseter muscle (bars on the top trace).

View larger version (103K): [in a new window]   Figure 3. Distribution and numbers of MesV neurons. (A,B) Examples of localization of MesV neurons in naïve control (A) and MesV-lesioned animals (B). Each dot indicates location of a MesV neuron. (C,D) Nissl-stained sections obtained from naïve control (C) and MesV-lesioned animals (D). (E) Distribution of cell bodies of MesV neurons in 6 naïve controls (open columns) and 7 MesV-lesioned animals (filled columns). Bars on the symbols indicate SEM. Note that about 70% of neurons are coagulated throughout the MesV. (F) The numbers of MesV neurons in naïve controls (N = 6) and MesV-lesioned animals (N = 7). The horizontal bars show the mean of each group.

View larger version (18K): [in a new window]   Figure 4. Temporal changes in the OVD, skeletal, and crown length in naïve controls, bite-raised controls, and bite-raised MesV-lesioned animals. (A) Temporal changes in the OVD measured as the length between V and T. (B) Developmental changes of the anteroposterior length of the cranium measured as the length between A and Po. (C) Temporal changes in the crown length measured as the length between Mu and Ml. The arrows indicate the day of removal of the appliance. *P < 0.05 compared with naïve controls. **P < 0.01 compared with naïve controls. +P < 0.05 compared with bite-raised controls. ++P < 0.01 compared with bite-raised controls. Bars on the symbols indicate SEM, and values on symbols in (A) indicate the number of animals.