Radiologic measurements of angles to horizontal long axis of condylar head.

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Other Title
  • 顎関節軸位Ｘ線像における下顎頭長軸角度の変動

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An angle of horizontal long axis in condylar head determined by the axial image is a prerequisite for individualized technique of lateral transcranial projection and sagittal tomography. The measurement of this angle is influenced by several factors including projection angles to the condyle examined and base lines to the long axis of condyle. The objective of this study was to determine the significance of these two factors and to measure the variaton of this angle in Japanese individuals. Five human dry skulls were radiographed using projection angles which were perpendiculary to the planes ranged between orbitomeatal and acanthiomeatal lines. Images obtained were served to measure the angle of long axis to three different base lines including a line connected both sides of ear rod, and two lines refered by the anatomical landmarks situated in the median sagittal plane. Results showed that the projection angles and base lines used in this experiment did not have significant effects to the measurement of angle. The most variances of angles came from the individual difference of shape in the condylar head, which indicates that the individualized positioning is necessary in the lateral projection and sagittal tomography. The horizontal long axis of condylar head measured in the 150 patients suffered from temporomandibular joint arthritis, was 13-15 degree and ranged between-6 degree and 37 degree. This value corresponds equally to the one previously reported in Japanese normal population.

Journal

  • Shika Hoshasen

    Shika Hoshasen 26 (4), 327-332, 1986

    Japanese Society for Oral and Maxillofacial Radiology

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