パノラマ X 線写真における下顎管およびオトガイ孔の X 線学的研究
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概要
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It is essential for dentisis to have a good knowledge of the anatomy of the mandibular canal and the mental foramen, especially while the mandible or mandibular teeth are being treated. In this study, the analysis of the width, position, and morphology of the mandibular canal and the position of the mental foramen was made radiologically. Panoramic radiographs showing distinct mandibular canal and no pathologic condition of the mandibular teeth were used for this study. The subjects for this study consisted of 308 males, aged 10 to 84. The results obtained are as follows : 1. Growth of width of the mandibular canal accelerated in the second decade. The width at the first and the second mandibular molar increased by aging. 2. Even when the inferior wall of the mandibular canal was found distinctly in all of the subjects, the superior wall of the mandibular canal appeared distinctly in only in 25.2%. The distinct appearance of the superior wall of the mandibular canal decreased by aging. The superior wall of the mandibular canal in the eighth decade appeared indistinctly in 90%. 3. The mandibular canal in the second decade was located at the midpoint between the mandibular molar root apex and the inferior mandibular cortex. The vertical distance between the root apex and the mandibular canal increased by aging. Then, the mandibular canal was to be located to the lower portion of the mandible by aging. 4. The mandibular canal did not always show a bilaterally symmetrical course. The mandibular canal showed a bilaterally symmetrical course in only 34%. 5. The mental foramen was located between the mandibular first premolar and the second premolar in 55%. The mental foramen located between the mandibular first premolar and the second premolar was predominant in the second decade. 6. The mental foramen showed a bilaterally symmetrical position in 70%. Therefore it can be said that the mental foramen is located almost in a bilaterally symmetrical position.
- 九州歯科学会の論文
- 1985-06-25
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- パノラマ X 線写真における下顎管およびオトガイ孔の X 線学的研究 : 主論文の要旨
- パノラマ X 線写真における下顎管およびオトガイ孔の X 線学的研究