若年性虚弱骨における食餌療法に関する実験的研究 : 下顎骨について

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In considering maximum bone volume, calcium plays an important role. Male Wistar rats, 8-week-old corresponding to human puberty, therefore, were given highly calcium-deficient diet and low calcium-deficiency diet for three weeks and juvenile bone debility was induced in them. Then the food was changed to standard diet and maintained for three weeks. The state of bone architecture was then investigated. The results were as follows : I. Body weight All of the control group, highly calcium-deficient diet+standard diet group, and low calcium-deficiency diet + standard diet group showed gradual increase in body weight through out the experiment period and so significant differences were found among the three. II. X-ray findings A. Macroscopic observation 1. Alveolar bone region and mental region As compared with the control group, the highly calcium-deficient diet+standard diet group showed insufficient thickness of the alveolar bone towards the incisal edge, poor development of the mental ridge, irregular arrangement of trabeculae, and decrease in the number of trabeculae on the whole. The low calcium-deficiency diet+standard diet group, as compared with the highly calciumdeficient diet+standard diet group, showed a tendency to increase in thickness of the alveolar bone towards the incisal edge, more development of the mental ridge, more regularity of arrangement of trabeculae on the whole, and a tendency to increase in the number of trabeculae. As compared with the standard diet group, about the same findings were observed. 2. Mandibular inferior margin As compared with the control group, the highly calcium-deficient diet+standard diet group showed irregular arrangement of trabeculae, extreme decrease in their number, and indistinct masseter muscle ridge. The low calcium-deficiency diet+standard diet group, as compared with the highly calciumdeficient diet+standard diet group, the finding of recovery in bone architecture was marked. B. Bone density by X-ray Significant differences were found between the control group and the highly calciumdeficient+standard diet group (p<0.01), and between the control group and the low calcium-deficiency diet+standard diet group (p<0.05), and the control group showed higher values. Significant differences were also found between the highly calcium-deficient+standard diet group and the low calcium-deficiency diet+standard diet group (p<0.05), and the low calcium-deficiency diet+standard diet group showed higher values. III. Hematologic examinations No significant differences were found in any group in electrolyte and biochemical examinations. Homeostatic mechanism was suggested to be involved in this. IV. Histopathologic findings As compared with the control group, the highly calcium-deficient diet+standard diet group showed many findings of bone resorption and clear decrease in bone volume. The low calcium-deficiency diet+standard diet group, as compared with the highly calcium-deficient diet+standard food group, showed marked findings of recovery of bone architecture and approximated the control group. V. Scanning electron microscope investigation The highly calcium-deficient diet+standard diet group, as compared with the control group, showed enlarged resorption sites of the bone adjacent to the periodontium. On the bone matrix, findings of increase of incomplete bone lacunae were seen on the whole mandibular bone. The low calcium-deficiency diet+standard diet group, as compared with the highly calcium-deficient diet+standard diet group, showed narrower width of the periodontium on the whole, and the bone architecture inside the bone showed recovery similar to the level in the control group. On the basis of the foregoing findings, intake of sufficient calcium and securing maximum bone volume in the growth process in the childhood stage to puberty would enable recovery of bone that may suffer calcium deficiency.
九州歯科学会の論文
1996-12-25

著者

木村孝一
九州歯科大学小児歯科学講座

若年性虚弱骨における食餌療法に関する実験的研究 : 下顎骨について

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