オトガイ下‐頭頂方向撮影法による顎関節のエックス線学的研究　　下顎頭形態の分析

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タイトル別名
  • Radiographic studies on the temporomandibular joint by means of submento-vertical projection. Morphological analysis of the mandibular head.
  • morphological analysis of the mandibular head
  • 下顎頭形態の分析

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To comprehend the morphology of the mandibular head (MH), area and S/L ratio of the MH, each were measured for size and shape on the Xeroradiography at the submentovertical projection. Further evaluation was performed from the measurement of the ratio of the major axis of MH to the minor axis, and the adjacent interior angle at each intersection which was made by the center line and the outline of the MH (Each central angle was 22. 5°).<BR>The comparison between the results of the patients so-called TMJ arthrosis and those of normal volunteers was mentioned below.<BR>1) The average MH area of the patients was 118. 37 mm2, and was smaller than that of normal volunteers (120. 88 mm2), especially in the patients with pain and sound at TMJ (96. 87 mm2).<BR>2) The difference of MH area between left side and right side was not significant in either the patients or normal volunteers. In the patients who had both sound and pain, there was a tendency for symptoms to be found at the smaller side.<BR>3) The average of S/L ratio in the patients with sound was 2. 40, and was significantly higher than the average in the patients with pain (2. 34).<BR>4) The ratio of the major axis of the MH to the minor axis (0. 41) was significantly higher in the patients with sound (p<0. 05).<BR>5) The average of the interior angle at the internal part of MH (93.30°) was significantly higher in the patients with sound (p<0. 05).<BR>Those results suggest that the morphology of MH was related with the occurrence of sound at TMJ, and MH was approaching a round and small shape in the patients with sound.

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