3-28. RADIOPAQUE LANDMARKS ON MANDIBULAR RADIOGRAPHS
a. Border of the Mandible. The border of the mandible is seen as a heavy
white line (see figure 3-30). A similar line does not appear on maxillary radiographs.
Figure 3-30. Border of the mandible.
b. External Oblique Ridge. The external oblique ridge is a white line of
variable density extending into the molar region as a continuation of the anterior border
of the ramus of the mandible (see figure 3-31).
Figure 3-31. External oblique ridge.