JOURNAL OF DENTAL HEALTH

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The follow-up examination was continued in infants 1 year and 6 months old and living in Tokyo for 1 year and 6 months. The selected subjects were at the period characterized by a remarkable increase of caries. The relation between increased caries teeth and their physical development during the study period was researched.
An examination of the correlations between number of increased decayed teeth, that of increased carious teeth surfaces, and physical-development-index (Quetelet, Kaup-index, Rohrerindex, Brugsch, the rate of incremental physical height, the rate of incremental physical weight, the rate of incremental girth of the chest) during the study period showed the rate of incremental physical weight could be an important subtractive factor in consideration of the mentioned relation. It was estimated that the rate of incremental physical weight was reduced by about 1% as carious teeth increased by one, and by two for carious teeth surfaces.
Futhermore, the physical weight development was degraded as the caries increased regardless of tooth type. On the relation between the susceptibility to caries and the rate of incremental physical weight, the increased rate was the lowest when lower primary canines, least susceptible, were affected by caries attack, followed by lower primary lateral incisors and by lower primary central incisors. On the other hand, the rate was the relatively high in upper primary central incisors and lower primary second molars. However these rates were lower than the rate observed in caries-free teeth.
Therefore, increased decayed primary teeth has been demonstrated to be in a close relation with physical weight development.

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Schoolchildren were asked to use dentifrices containing three different agents for one year: the agents were sodium monofluorophosphate, sodium monofluorophosphate plus dextranase, and sodium monofluorophosphate plus sodium phosphate. The caries prevention effects of these dentifrices were studied. The group of children who used dentifrice containing 0.76% sodium monofluorophosphate showed a 25.5% caries inhibition rate, and a statistically significant difference was observed in the rate of DF surfaces which increased during the test period in contrast to the control group. A significant difference was also found between the group of children who used dentifrice containing sodium monofluorophosphate alone and another group of children who used dentifrice containing sodium monofluorophosphate plus dextranase (15, 000 units/g dentifrice added to sodium monofluorophosphate). An addition of dextranase resulted in an increase of 16.8% in the rate of caries inhibition. Another group of children who used dentifrice containing sodium monofluorophosphate to which 3% sodium phosphate was added showed a 4.6% higher caries inhibition rate than that shown in the group using dentifrice containing sodium monofluorophosphate alone, but there was no statistically significant difference in the rate of increased DF surfaces between these two groups. Furthermore, the caries prevention effects by tooth type and tooth surface were also evaluated for these three kinds of dentifrice. Moreover, it was confirmed that a continuous use of these four dentifrices over the period of one year did not result in oral anomalies either subjectively nor objectively.

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