Journal of Prevention and Treatment for Stomatological Diseases ›› 2017, Vol. 25 ›› Issue (9): 560-564.doi: 10.12016/j.issn.2096-1456.2017.09.003

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Experimental study on the effects of green tea on salivary flow rate and pH value

Yuanhong LI(), Xinyi FANG, Yu QIU, Lei CHENG()   

  1. West China School of Stomatology Sichuan University, Chengdu 610041, China
  • Received:2016-08-03 Revised:2016-11-02 Online:2017-09-20 Published:2018-09-03

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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

CLC Number: 

  • R780.2

Table 1

The experimental time record"

记录形式 时间段
t0 饮水/茶前
t1 饮水/茶后1~5 min
t2 饮水/茶后5~10 min
t3 饮水/茶后10~15 min
t4 饮水/茶后15~20 min
t5 饮水/茶后20~25 min
t6 饮水/茶后25~30 min
t7 饮水/茶后30~35 min
t8 饮水/茶后35~40 min
t9 饮水/茶后40~45 min

Figure 1

Women salivary flow rate after drinking different concentration of green tea"

Table 2

Saliva flow rate of women after drinking different concentration of green tea x?± s,mL/min"

组别 时间段 平均值 F值 P值
t0 t1 t2 t3 t4 t5 t6 t7 t8 t9
清水组 0.32 ± 0.15 0.28 ± 0.16 0.26 ± 0.11 0.27 ± 0.12 0.26 ± 0.10 0.26 ± 0.12 0.26 ± 0.12 0.27 ± 0.10 0.25 ± 0.12 0.22 ± 0.11 0.27 ± 0.12 1.38 0.19
低浓度茶水组1） 0.25 ± 0.13 0.27 ± 0.13 0.25 ± 0.11 0.27 ± 0.13 0.31 ± 0.15 0.31 ± 0.15 0.31 ± 0.22 0.28 ± 0.14 0.27 ± 0.12 0.30 ± 0.17 0.28 ± 0.14 0.67 0.73
中浓度茶水组1） 0.25 ± 0.11 0.29 ± 0.12 0.27 ± 0.12 0.27 ± 0.12 0.30 ± 0.14 0.31 ± 0.15 0.26 ± 0.10 0.30 ± 0.12 0.27 ± 0.12 0.27 ± 0.15 0.28 ± 0.12 0.75 0.66
高浓度茶水组 0.26 ± 0.17 0.25 ± 0.16 0.24 ± 0.13 0.25 ± 0.13 0.26 ± 0.13 0.24 ± 0.11 0.24 ± 0.11 0.25 ± 0.15 0.24 ± 0.12 0.25 ± 0.13 0.25 ± 0.13 0.11 0.99
平均值 0.28 ± 0.14 0.28 ± 0.13 0.27 ± 0.11 0.28 ± 0.12 0.29 ± 0.12 0.29 ± 0.12 0.27 ± 0.14 0.29 ± 0.12 0.27 ± 0.11 0.27 ± 0.14 0.27 ± 0.142） 0.702） 0.872）
F值 1.45 0.33 0.35 0.16 1.74 2.02 1.65 0.95 0.45 1.79 5.202） （F = 1.62,P = 0.03）3）
P值 0.23 0.80 0.78 0.91 0.16 0.11 0.18 0.41 0.71 0.15 0.002）

Figure 2

The curves of the salivary pH-time"

Table 3

Saliva pH after drinking the tea in different concentrations x?± s"

组别 时间段 平均值 F值 P值
t0 t1 t2 t3 t4 t5 t6 t7 t8 t9
清水组 7.38 ± 0.36 7.51 ± 0.41 7.42 ± 0.34 7.44 ± 0.35 7.38 ± 0.37 7.41 ± 0.35 7.41 ± 0.34 7.41 ± 0.35 7.41 ± 0.39 7.37 ± 0.40 7.38 ± 0.54 0.51 0.56
低浓度茶水组1） 7.23 ± 0.32 7.27 ± 0.30 7.31 ± 0.47 7.25 ± 0.41 7.24 ± 0.38 7.30 ± 0.37 7.20 ± 0.34 7.23 ± 0.35 7.22 ± 0.37 6.97 ± 1.29 7.22 ± 0.42 0.87 0.40
中浓度茶水组1） 7.19 ± 0.22 7.27 ± 0.32 7.23 ± 0.31 7.24 ± 0.35 7.22 ± 0.33 7.22 ± 0.30 7.26 ± 0.34 7.22 ± 0.37 7.22 ± 0.30 7.26 ± 0.36 7.23 ± 0.31 0.75 0.63
高浓度茶水组1） 7.33 ± 0.36 7.30 ± 0.39 7.21 ± 0.41 7.19 ± 0.36 7.20 ± 0.40 7.19 ± 0.37 7.20 ± 0.38 7.22 ± 0.35 7.22 ± 0.39 7.13 ± 0.41 7.24 ± 0.34 1.18 0.31
平均值 7.28 ± 0.33 7.30 ± 0.37 7.27 ± 0.36 7.25 ± 0.34 7.25 ± 0.34 7.26 ± 0.36 7.25 ± 0.38 7.27 ± 0.43 7.30 ± 0.48 7.24 ± 0.71 7.27 ± 0.422） 1.142） 0.332）
F值 2.46 2.80 2.11 1.48 2.00 3.20 2.42 2.26 2.49 2.22 3.502） （F = 0.85,P = 0.57）3）
P值 0.06 0.04 0.10 0.22 0.12 0.02 0.07 0.08 0.06 0.09 0.022）
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