A research on epidemiology of multiple anterior malocclusions of children.

So far there are few report of large sample on epidemiology of children's multiple-anterior cross-bite malocclusions (MACBM) in China. We investigated the epidemiology of MACBM in 10075 3-11 years old children in Beijing Western District by random sampling. MACBM was confined to cross-bite malocclusions of (not including cross-bite on one side or on one individual tooth). The procedure of sampling was general survey in kindergarten and primary school, then the meeting of parents of suffering children, followed by checking their name, sex, age, cause, feed, bad habit and history of family in each teeth-age group (baby teeth group, the first stage group and later stage group of substituting teeth). All data were calculated by statistical analysis and T-Test. The statistical data showed that in the sample of 10,075 children the incidence of MACBM was 5.04% (the rate of male was 5.73%; the female 4.32%); the baby teeth stage group 7.15%; the first stage of substituting teeth group 5.74%; the later stage 2.99%. One third of suffering children were caused by genetic factor. Two third were acquired. Among those postnatal caused, which was ground insufficient was the main cause (31.1) 17.9% and 14.5% of suffering children were caused by bad habits and bad feeding posture, respectively. It is worth paying attention to the fact that only 2% of suffering children went to see dentists and no one of 119 cases of baby teeth stage was treated by a orthodontists in the place like Beijing Western District where the medical conditions and cultural background are much better than other places in China.(ABSTRACT TRUNCATED AT 250 WORDS)