红茶对沙特一组人群唾液中[具体物质1]和[具体物质2]水平的影响。 （你提供的原文中“and”前后应该有具体物质名称缺失了）
Influence of black tea on and levels in saliva in a Saudi cohort.
作者信息
Ramadan AbdelRahman M, Bakeer Hala A, Mahrous Mohamed S, Hifnawy Tamer M
机构信息
Periodontology and Oral Medicine, Preventive Dental Sciences Department Division of Periodontology, College of Dentistry, Taibah University, KSA.
Periodontology and Oral Medicine, Preventive Dental Sciences Department Division of Dental Public Health, College of Dentistry, Taibah University, KSA.
出版信息
J Taibah Univ Med Sci. 2019 Apr 2;14(2):179-186. doi: 10.1016/j.jtumed.2019.02.008. eCollection 2019 Apr.
OBJECTIVES
Dental caries are associated with high counts of S (SM) and (LB) and low saliva buffering capacity (BC). This study aimed to evaluate the antimicrobial activity of black tea on salivary cariogenic microflora, SM and LB species in an adult population. Antimicrobial activity was measured from the number of colony forming units (CFUs) of SM and LB, and BC of saliva.
METHODS
In this prospective experimental study, unstimulated saliva samples were acquired from the participants before, immediately after, and 1 h after drinking tea by collecting saliva in sterilised containers. Samples were taken to the laboratory for incubation and subsequent counting. SM and LB counts and BC of saliva were calculated using the caries risk test (CRT).
RESULTS
A total of 21 participants, 13 males and 8 females, with a mean age of 32.6 ± 8.02, were recruited in this study. Black tea had no significant effect on reducing the cariogenic bacterial counts ( > 0.05).
CONCLUSION
Based on this study, it can be deduced that black tea exhibits an insignificant antimicrobial effect against and bacteria.
目的
龋齿与高计数的变形链球菌（SM）和嗜酸乳杆菌（LB）以及低唾液缓冲能力（BC）相关。本研究旨在评估红茶对成年人群唾液致龋微生物、变形链球菌和嗜酸乳杆菌的抗菌活性。通过变形链球菌和嗜酸乳杆菌的菌落形成单位（CFU）数量以及唾液缓冲能力来测定抗菌活性。
方法
在这项前瞻性实验研究中，通过在无菌容器中收集唾液，在参与者喝茶前、喝茶后立即以及喝茶后1小时采集非刺激性唾液样本。将样本送至实验室进行培养并随后计数。使用龋病风险测试（CRT）计算唾液中变形链球菌和嗜酸乳杆菌的计数以及缓冲能力。
结果
本研究共招募了21名参与者，其中男性13名，女性8名，平均年龄为32.6±8.02岁。红茶对降低致龋菌计数没有显著影响（P>0.05）。
结论
基于本研究，可以推断出红茶对变形链球菌和嗜酸乳杆菌的抗菌作用不显著。
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