[Effects of fluoride on expression of survivin during rats' dental germ development].

Purpose: This study was to investigate the expression of survivin in dental germ development of SD rats with fluorosis, and explore the effects of fluoride on survivin expression and the pathogenic mechanism of dental fluorosis.

Methods: Forty-five SD rats (pregnant for 10 days) were randomly divided into control group, experimental group 1 and group 2. Drinking water with fluoride concentration of 0, 50, 150 mg/L was provided for rats accordingly.

[A study of oral health behaviors among 65 to 74 years old people in Shanxi province].

Purpose: To assess the oral health behaviors among 65 to 74 years old people in Shanxi province, and provide a base line for oral health service.

Methods: Four hundred and five old people aged from 65 to 74 in Shaanxi province was selected according to the Third National Oral Health Investigation Criteria and the oral health behaviors of them were investigated by questionnaire. SPSS 13.