成長発育期ラットの運動負荷による顎骨への影響
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概要
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The mechanism of action of physical exercise and calcium intake on the jaw bones at the growth and development stage has not yet been clarified. Four-week-old male rats of Wistar strain, therefore, were used, and running exercise and food of different calcium contents were given at the same time. Their effects on the jaw bones were then investigated. The results were as follows : I. Body weight In the normal diet group, no significant differences were found from the first week through the fourth week, the calcium deficient diet group with physical exercise showed lower values (p<0.01) than the calcium deficient diet group with no physical exercise. II. Bone density findings Bone density was measured to determine degrees of bone calcifiction. No significant differences were found in the normal diet group and in the calcium deficient diet groups. Significant differences were found between the normal diet group and calcium deficient diet groups and the normal diet group showed higher values (p<0.01). III. Histopathological findings In the normal diet group, no particular changes were found in the internal structure of jaw bones from the lingual alveolar bone, central alveolar bone, buccal alveolar bone, to the labial alveolar bone. In the calcium deficient diet groups, the lingual alveolar bone, central alveolar bone, buccal alveolar bone, and labial alveolar bone showed about the same findings. In the comparison between the normal diet group and calcium deficient groups, the whole lower jaw showed extensive decrease in bone quantity for the calcium deficient groups. IV. Scanning electron microscope findings In the normal diet group and calcium deficient diet groups, no morphological changes were found in the jaw bones from the lingual alveolar bone, central aleolar bone, buccal alveolar bone, to labial alveolar bone. V. Findings in physical strength of the lower jaw bone by compression In the normal diet group and the calcium deficient diet groups, significant differences were found and the normal diet group showed higher values (p<0.01). On the basis of the foregoing findings, it was found clearly that physical exercise given to rats at the growth and development stage did not affect the jaw bones. The nutrient have an effect on the jaw bones of the rats at the growth and development stage.
- 九州歯科学会の論文
- 1995-12-25