Abstract:

Objective The purpose of this study was to compare the effects of different concentrations of green tea on salivary flow rate and pH value. Methods 20 healthy college students aged from 18 to 25 were included in this study, at State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University. Salivary flow rate and pH value were measured between 21: 00 and 22: 00 after drinking water, low, medium, and high concentration of green tea. Results Female salivary flow rates in low and medium concentration group were significant higher than that in high concentration group and water group (F=5.20, P < 0.01). There was no significant difference in male salivary flow rates among 4 groups (F=1.810, P=0.143). Salivary pH value in 3 green tea groups were lower than that in water group (F=3.50, P=0.02), with no significant difference among them. Conclusion Low and medium concentration green tea prevent decrease of salivary flow rate in healthy women but not in males. Salivary pH lowers after drinking different concentrations of green tea.

Key words: Green tea, Salivary flow rate, Salivary pH, Caries, Demineralization

摘要：

目的 探讨饮用清水及不同浓度绿茶对唾液流速及pH值的影响。方法 纳入18~25岁全身健康状况良好的在校大学生20人为研究对象,受试者于晚上9：00-10：00分别饮用清水和低、中、高浓度绿茶后,测定一定时间段内唾液流速和pH值。结果 饮用中、低浓度绿茶水后,女性口腔健康者中唾液流速高于高浓度茶水组和清水组（F=5.20,P < 0.01）;男性口腔健康者各组别差异无统计学意义（F=1.81,P=0.14）。饮用低、中和高浓度茶水后的唾液pH值要低于清水组（F=3.50,P=0.02）,各浓度茶水组的差异无统计学意义。结论 中、低浓度绿茶水可预防女性口腔健康者唾液流速降低,而对男性无明显作用。饮用各浓度绿茶水后,唾液pH值降低。

关键词: 绿茶, 唾液流速, 唾液pH值, 龋齿, 脱矿