A Study on the Measurement of the Biting Pressure and Masticatory Efficiency in Children

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  • 小児の咬合力, 咀嚼能力の測定に関する研究

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Abstract

We measured the biting pressure and masticatory efficiency using A. T. P. particles for 80 children, their ages ranging from 3 to 5 years, and who visited the Department of Pedodontics Kyushu Dental College Hospital.<BR>The results were as follows:<BR>1. The mean of the biting pressure for a 3 year old boy was 14.00 Kg, for a 4 year old boy 15.64 Kg, and for a 5 year old boy 21.33 Kg. For a 3 year old girl it was 13.70 Kg, for a 4 year old girl 15.21 Kg, and for a 5 year old girl a 20.40 Kg.<BR>2. Masticatory efficiency was measured by spectrophotometer and the mean of the masticatory efficiency for a 3 year old boy it was 0.096 Abs, for a 4 year old boy 0.113 Abs, and for a 5 year old boy 0.127 Abs. Fora 3 year old girl was 0.092 Abs, for a 4 year old girl 0.111 Abs, for a 5 year old girl 0.117 Abs. We made a calibration curve and changed the percentage froman expression of the regressive line, Y=0.726 X. The result was that the mean of the percentage from a 3 year old boy was 7.00%, from a 4 year old boy 8.20%, for a 5 year old boy was 8.47%. For 3 year old girl was 6.69%, for 4 year old girl 8.05%, and for 5 year old girl 8.49%.<BR>3. The coefficient of the correlation of the biting pressure and the masticatory efficiency for 3 year old children was 0.613, the coefficiency of the correlation for 4 year old children was 0.332, and the coefficient of the correlation for 5year old children was 0.530. Thc whole is 0.635. (p<0.01)

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