The following are the results of our investigation on decayed and lost teeth and food preference, which was carried out on a total of 4, 138 fifth-grade pupils (2, 028 boys and 2, 110 girls) in the elementary schools of
Koto
Ward, Tokyo in the 37th year of Showa (1962).
1. As for their decayed and lost teeth, the comparison between national figures and those of the pupils in
Koto
area reveals the following:
1) The cases of untreated dental caries among
Koto
pupils amount to 65.4%, lower than the national average by more than 10%.
2) The number of decayed teeth per capita is 0.7 in
Koto
, about 1 fewer than the national figure.
3) When dental caries is observed under different classes of C
1, C
2, C
3 and C
4, the percentages of the decayed teeth under C
1, C
2, C
3 and C
4 against the total number of teeth are respectively 3.7%, 1.7%, 1.4% and 0.4%. Compared with the national percentages, those of C
1, C
2 and C
3 are respectively about 60% of the national ones, while C
4 takes up almost the same percentage as the national one.
4) The lost teeth among the
Koto
pupils account for 0.4% of the total number of teeth, somewhat higher than the national percentage.
5) As viewed from the above records, the status of dental sanitation for the pupils in
Koto
Ward is considered to be better than the national status.
2. As the result of our investigation on the unbalanced diet habit of the pupils in
Koto
area, it is known that the unbalanced diet occurs more frequently in those who are free of dental caries than in those who have decayed teeth.
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