Evaluation of the Effect of Oolong Tea on the Mean Salivary pH of Students of Gorgan Faculty of Dentistry: A Double-blind Randomized Controlled Clinical Trial

Evaluation of the effect of Oolong tea on the mean salivary pH of Students of Gorgan Faculty of Dentistry in 2024

Clinical trial with two arm parallel group, randomized and double blind

After determining the salivary pH of the participants, a person who is aware of the numbering of the glasses and the block allocation of the numbers provides them to the participants. To prepare tea, 4 grams of dry oolong tea is poured into 150 ml of boiling water. After putting the lid on the container for three to five minutes, we pass the solution through the filter. 150 ml of boiling water is used to prepare the placebo. 150 ml of each substance (oolong tea or placebo) was separated and after reaching room temperature, the distributor gave it to the participants without knowing the contents of each glass. Due to the fact that containers with non-transparent lids are used, the candidate will not notice the color of oolong tea or placebo. Sampling will be done in the Department of Oral and Dental Diseases of Gorgan Faculty of Dentistry between 10 AM and 12 PM. Volunteers are asked to comfortably swallow a glass of oolong tea or placebo. For sampling, each person is asked to pour their immobilized saliva (in a sitting position) into the test tube through the lower lip within 3 minutes and every 60 seconds before consuming tea, 1, 5 and 10 minutes after consuming tea. Sampling will be done in separate tubes. A digital pH meter will be used to evaluate saliva pH.

Willingness to participate in the study, Systemically healthy, Not taking medicine in the past month, Having good oral hygiene, Absence of gingivitis, periodontitis and active tooth decay. ​

Oolong tea/placebo group

Salivary pH

50 healthy students of Gorgan Faculty of Dentistry aged between 20 and 30 who are eligible to the study will be selected by randomized sampling and after obtaining their informed consent, they will be distributed into two groups of 25 people by block randomization method. 50 random numbers will be generated with R software. The two groups will be as follows: Elang tea group: (1,5,9,10,11,21,41,38,12,29,13,23,43,34,2,3,8,31,17,30) Placebo group: (6,7,16,25,27,33,35,20,40,46,22,15,50,45,4,14,19,32,28,18)

This study is a double-blind randomized controlled clinical trial study, which the participants and distributors of the oolong tea and placebo are not aware of the arrangement of people in the groups.