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Adjustment of the Occlusal Vertical Dimension in the Bite-raised Guinea Pig

¹ Department of Oral Physiology and
² Department of Orthodontics, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565-0871, Japan;

View larger version (83K): [in this window] [in a new window]   Figure 1. Landmarks on a cephalometric radiograph and temporal changes in the OVD after fixation of the bite-raising appliance. (A) Landmarks on the trace of the cephalometric radiograph used for measurement of the OVD. So: The intersection between the posterior border of the basisphenoid and tympanic bulla. E: The intersection between the frontal bone and the most superior-anterior point of the posterior limit of the ethmoid bone. A: The most anterior point on the nasal bone. Po: The most posterior point on the cranial vault. Pg: A point on the most inferior contour of the lower border of the mandible, adjacent to the incisor. Gn: A point on the most inferior contour of the angular process of the mandible. U1: A point on the most anterior edge of the upper first molar. Mu: A point on the intersection between the maxillary bone and the mesial surface of the upper first molar. Ml: A point on the intersection between the mandibular alveolar bone and the mesial surface of the upper first molar. V: The intersection between the E-A line and the perpendicular to the E-A line through U1. T: The intersection between the Pg-Gn line and the U1-V line. V-T: Vertical dimension. A-Po: Antero-posterior length. Mu-Ml: Crown length. (B) The cephalometric radiograph on the day of fixation of the bite-raising appliance. There is a space of 3 mm between the upper and lower first molars. The arrow indicates the bite-raising appliance. (C) The cephalometric radiograph at 10 days after fixation of the appliance, i.e., the day of appliance removal. Note that the intermolar space was filled by eruption of the teeth. (D) The cephalometric radiograph at 5 days after appliance removal. Note that the OVD was reduced.

View larger version (24K): [in this window] [in a new window]   Figure 2. Temporal changes in the OVD, skeletal, and dental structures in the animals with the raised bite of 3 mm. (A) Temporal changes in the OVD measured as the length between V and T. (B) Developmental changes of the anteroposterior length of the cranium. (C) Temporal changes in the crown length measured as the length between Mu and Ml. The dotted and solid lines indicate the OVDs in the control and 3-mm-raised animals, respectively. The arrows indicate the day of appliance removal. Asterisks: Significant difference at p < 0.01 between the control and 3-mm-raised animals.

View larger version (23K): [in this window] [in a new window]   Figure 3. Temporal changes in the OVD, skeletal, and dental structures in the animals with the raised bite of 1.5 mm. (A,B,C) Data from the same kind of experiment as in Fig. 2, except that the raised bite was 1.5 mm.

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