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To investigate the parent’s knowledge practice related to dental plaque index of preschool children, questionnares and examination were conducted for 312 preschool cildren of 3-5 years old and their parents in Taegu from 1st to 30 of September, 1991. The average dental plaque index for 312 preschool children who were examined was 1.90 it showed a bad oral hygiene. cildren dental plaque index of parents use a correct brushing method and high brushing frequency, the more dental plaque index was reduced. children dental plaque index of parents who had experienced a preventive dental visits was decreased too. The more parents make children brush tooth on time frequently and the more children who follow parent’s advice on tooth brushing well, the more children’s dental plaque index showed reduction. dental plaque index of children who eated meat, vegetables and fruits evenly was decreased. the more parents who control time of children’s sugar intake, the more cildren’s dental plaque index showed significant reduction(P<0.05). the more mother have a job, the more cildren’s dental plaque index decreased significantly(P<0.05). the cildren who talk frankly brushing frequency in a day differed from parent’s an answer. the more brushing frequency increased, the more dental plaque index was decreased with statistically significant difference(P<0.001). The results obtained in this study suggest that a high dental plaque index have a great influence on children’s oral hygiene. parents’s answer on oral health practice differed from children’s, so it need an education to practice in practice.
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