Abstract
Recently, the growth and development of the oral cavity in childhood have come to notice. It is important to know the effect of calcium intake on the jaw.
The authors therefore gave calcium deficient food to three-week old rats of the Wistar strain and induced a state of bone debility in them. The rats were then given a mixed food of the calcium-rich cattle bone and standard food and the effect on bone construction in the mandibular condyly at growth stage was investigated.
The results were as follows;
1. Based on the radiological findings, it was found administration of high calcium food resulted in larger mandibular condyle shape and an increase in and regularity of the trabeculae.
2. Based on the findings from analysis with an X-ray microanalyzer, it was found that administration of high calcium food increased both the relative Ca ratio and the relative P ratio. The minimum values in the calcium-deficient food group and the values of the calcium-deficient food group and high calcium food group approximated those of the control group.
3. Based on the histopathological findings, it was found that administration of high calcium food showed regular borders of the chondrocyte layers, decrease in hypertrophic chondrocytes, increase in the calcified matrices surrounding hypertropic chondrocytes, active formation of the trabecular, and that the trabecular were thin. However, it was unsatisfactory to compare with the control group.
4. Based on the scanning electron microscopic findings, it was found that administration of high calcium showed a decrease of chondrocyte layers, active formation and an increase width of the trabeculae. However compared with the control group, it was still unsatisfactory.
On the basis of the foregoing findings, administration of a calcium-rich cattle bone to debelitated bone tissue in the mandibular condyle at growth state accelerated the growth of bone constrcution. The state of the restoration was shown to be insufficient.
