Microbiota of preterm infant develops over time along with the first teeth eruption.

Objective: The temporal growth of the infant microbiome in the early years of life influences short- and long-term infant health. The aim of this longitudinal study was to investigate bacterial dynamics in the microbiome of preterm infants during tooth eruption.

Methods: Saliva samples from normally delivered ( = 24) and preterm infants ( = 31) were collected 30 days after birth and after the eruption of two primary mandibular incisors.

[Risk factors of dental caries among young children in Pudong New District, Shanghai].

Porpose: To establish a prospective cohort of kindergarten children and longitudinally study the causes of early childhood caries.

Methods: Cluster random sampling was used to select a kindergarten in the urban and suburban areas of Pudong New District of Shanghai, a total of 240 small-class children joined the study. Chi-square test, analysis of variance, binomial logistic regression model and general linear regression model was used to analyze caries of the cohort children at baseline and 1 year after follow-up with SPSS 21.