The purpose of this investgation was to study on the correlatiion between x-ray angulation and radiographic TIMJ space by transcranial radiography using Accurad-100. A dry skull with a complete maxillary and mandibular dentition, and a normal appearance of the mandibular condyles and glenoid fossa was selected for the study.
The skull was positioned in the TMJ angle board and the Denar Accurad-100, and serial transcranial radiography of the articulated mandible was taken.
The results were as follows
1. Transcranial radiography represented a cross sectional view of the shape of the lateral one-third of the condyle.
2. As the vertical angle of the projection was increased, the petrous line was positioned more inferiorly and the angle of the petrous line became steeper, and the proximal posterior _.clinoid process was positioned more inferiorly.
3. As the horizontal angle of the x-ray projection was directed more anteriorly from posterior, the petrous line became positioned rrore superiorly and the angle of the petrous line became less steep, and the proximal posterior clinoid process became positioned more anteriorly.
4. As the vertical angle of the projection was increased, all the TMJ spaces of anterior, superior, and posterior were gradually decreased. As the horizontal angle of the x-ray projection was directed more anteriorly from posterior, the posterior TMJ space was decreased, but the anterior TMJ space was increased.
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