乳歯の咬合力に関する実験的研究
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概要
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An experimental measurement has been conducted on the biting force of individual deciduous teeth of the children 4 to 5 years of age having normal deciduous dentition and of those having dentition separated by the developmental spaces. The measurement was done by using a specially designed springed apparatus. 1) The approximate values of the biting force for individual deciduous teeth in the lower jaw having normal dentition were expressed as follows. name of the tooth biting force in kilogram male female central incisor 4.9 4.7 lateral incisor 4.9 4.6 cuspid 7.2 6.8 first molar 11.0 10.8 second molar 16.0 15.7 2) The biting force of the deciduous anterior teeth having developmental spaces between them was expressed as follows. name of the tooth biting force in Kilogram male female central incisor 4.0 4.0 lateral incisor 4.0 3.9 cuspid 6.0 5.9 3) The difference in the biting forces between both halves of the normal dentition was not found significant and both values were considered generally equal. 4) The sex difference in the biting force of the normal deciduous dentition was considered generally significant, and the biting force in the male exceeded that in the female, the more the further backward the teeth involved. 5) The deciduous anterior teeth having developmental spaces had definitely lesser values of the biting force than the corresponding normal teeth indicating that the biting force could be greatly influenced by the presence or absence of the contact point between the teeth even in the deciduous dentition.