乳歯齲蝕の疫学調査に関する統計的研究
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概要
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71, 756 teeth of 4, 016 children one to five years old living in Tokyo Metropolis were studied. These subjects were classified into groups of monthly age as follows: the one-year-old group with the interval of 3 months, two, three, and four-year-old groups with the interval of 4 months respectively, and five-year-old group, 6 months. Carious teeth were studied with the use of df. The following results were obtained.<BR>1. Change of each statistic value of general df teeth according to monthly age.<BR>The rate of possessors of df teeth markedly increased in one-year-old children to those in the beginning of the age of three, reaching the maximum value in those in the latter half of the age.<BR>The average number of df teeth per person slowly increased in one-year-old children to those in the beginning of the age of two, followed by a marked increase in those over the age.<BR>The rate of df teeth increased slowly in one-year-old children, and markedly in those over the age of two.<BR>The average number of tooth surfaces with df per person slowly increased in one-year-old children to those in the begining of the age of two years, followed by a marked rise in those over the age.<BR>The rate of tooth surfaces with df slowly increases in one-year-old children and those in the beginning of the age of two, and considerably increased in those over the age up to the end of four years of age.<BR>The rate of df teeth according to kinds of teeth markedly increased in deciduous upper middle incisors, deciduous lateral incisors, and deciduous canine teeth in one-year-old children to those in the beginning of the age of three.<BR>The first and second upper deciduous molars were rarely affected by caries in one-year-old children to those in the beginning of the age of two, but there was a marked increase in caries in those over the age of two and a half.<BR>Deciduous lower middle incisors, lateral incisors, and canines were rarely affected by caries in children under the beginning of the age of wo, and there was a slow increase in the values in those over the age.<BR>In deciduous lower first and second molars, the values were extremely low in children under the beginning of the age of two, but there was a marked increase in the values in children over the age.<BR>2. Correlations in statistic values of df.<BR>Highly significant correlations were found in values of general df, in values of df according to the kinds of teeth, and between each value of general df and that of df according to the kinds of teeth.<BR>Factor analysis of each statistic value of general df revealed no remarkable difference in proportion occupied by each valuable in one factor.<BR>3. Relationship between the rate of possessors of df teeth and other values of df.<BR>The rate of possessors of df teeth is to be called X, the average number of df teeth per person Y<SUB>1</SUB>, the rate of df teeth Y<SUB>2</SUB>, the average number of tooth surfaces with df per person Y<SUB>3</SUB>, the rate of tooth surfaces with df Y<SUB>4</SUB>, the rate of df in the upper deciduous middle incisors Y<SUB>5</SUB>, the rate of df in the upper deciduous lateral incisors Y<SUB>6</SUB>, the rate of df in the upper deciduous canines Y<SUB>7</SUB>, the rate of df in the upper deciduous first molars Y<SUB>8</SUB>, the rate of df in the upper deciduous second molars Y<SUB>9</SUB>, the rate of df in the lower deciduous middle incisors Y<SUB>10</SUB>, the rate of df in the lower deciduous lateral incisors Y<SUB>11</SUB>, the rate of df in the lower deciduous canines Y<SUB>12</SUB>, the rate of df in the lower deciduous second molars Y<SUB>14</SUB>.
- 有限責任中間法人 日本口腔衛生学会の論文