| Objectives:In the condition of three different feeding patterns:the breastfeeding,the mixture and the artificial feeding, to analysis the relationship between colonization of S.Mutans and feeding pattern, to detect S.Mutans strain's genotype of the mothers and their chideren and to analysis the source of the spread of S.Mutans in the infant and early childhood' oral cavity.Methods:1.90 pairs of 6-36 months old babies and their mothers in Lanzhou were randomly selected and the related feeding information was obtained by questionnaire. Using Dentocult SM chorionicgonadotropin to test S.Mutans in oral saliva of the children and their mothers respectively.2.The S.Mutans strains were isolated from the mouth of the children and their mothers. Then the AP-PCR was adopted to detect the S.Mutans'genotype, to observe the number of the S.Mutans' genotype and to analysis the same genotype of the mother-children.Results:1.The incidence of S.Mutans colonization in breastfeeding way is lower than that of others. The S.Mutans' variation trend between the mother and children in the breast feeding exists positive correlation (P<0.05), but there are no difference between the mixture and artificial feeding styles(P>0.05). The gender in infant has no influence on S.Mutans colonization(P>0.05).2.According to the AP-PCR, there are the same S.Mutans genotypes between the mother and their children in the three groups respectively. Individual infants'S.Mutans genotype was different from their mother's.Conlusion:Breast feeding can delay the colonization process of S.Mutans in infant and early childhood oral cavity compared with mixture feeding and artificial feeding. Gender has no influence on S.Mutans colonization of the infants. The vertical transmission from the mothers to their children exists in three groups respectively. There are other sources of the S.Mutans in the infant and early childhood.
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