成長期ラットの下顎骨に対する食物の硬軟の影響に関する研究 : 骨塩量, 強度ならびに形態変化

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概要

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• The purpose of this research was to study the influence of the difference in dietary physical consistency, which is the representive factor of local environmental factors, on the morphology, the bone mineral levels and the physical strength of the mandibular bone in the growth stage. Three-week-old rats of Wistar strain were used. Thirty rats were randomly divided into three groups : the hard diet group (control group), the kneaded diet group and the powdered diet group. All of the rats were fed for six weeks. After six weeks, the rats were sacrificed. Roentgenographic lateral cephalograms were taken to investigate the morphological changes of the mandible, and the mineral content of the mandibular bone by the microdensitometry method and mandibular physical strength by compressive test were examined. The results were as follows, 1. The average compressive strength of each diet was 64.8 kg/cm^2 for the control group and 1.9 kg/cm^2 for the kneaded diet group. 2. There were no significant difference in body weight between the control group, the kneaded diet group and the powdered diet group throughout the experimental period. 3. The lateral cephalometric analysis showed the morphological changes at the mandibular ramus, including angular process. Morphologic reduction was found significantly in coronoid process of kneaded diet group and in coronoid process, condyle and angular process of powdered diet group. 4. The bone mineral content of alveolar bone and mentum was significantly lower in both the kneaded and the powdered diet group. Meanwhile at the region of the mandibular lower margin and angular process, the content was significantly lower in powdered diet group. 5. Compressive strength of mandible was significantly lower in kneaded diet group and powdered diet group. The strength declined with decreasing of physical strength of diet. From these results, it is suggested that the difference of dietary physical consistency influences not only morphological chages but also alteration in internal characteristic of mandibular bone in the growth stage.

• 九州歯科学会の論文
• 1994-02-25

著者

• 高橋 忠

  九州歯科大学大学院歯学研究科

関連論文

• 成長期ラットの下顎骨に対する食物の硬軟の影響に関する研究 : 骨塩量, 強度ならびに形態変化 : 主論文の要旨
• 成長期ラットの下顎骨に対する食物の硬軟の影響に関する研究 : 骨塩量, 強度ならびに形態変化

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