Zamzam Rouaa, Karkoutly Mawia, Bshara Nada
Pediatric Dentistry Department, Faculty of Dentistry, Damascus University, Damascus, Syria.
BDJ Open. 2023 Sep 13;9(1):44. doi: 10.1038/s41405-023-00170-8.
This study aimed to evaluate salivary pH changes after consuming three types of milk in children aged 3-5 years. The null hypothesis was that no statistically significant difference would be noted in the salivary pH between high-protein, full-fat, and sweetened milk groups at different time points.
This was a double-blind, pilot randomized controlled crossover trial. 30 Children have undergone three experimental sessions with a 1-week washout period. Each child was given 250 mL of one of the following types of milk: high-protein, full-fat, or sweetened milk. The salivary pH was measured at the baseline (t) after 5 (t), 10 (t), 15 (t), 30 (t), and 60 (t) minutes of milk consumption, using a pH saliva indicator strip.
There is a sharp drop in salivary pH after 5 min of sweetened (P < 0.05) and full-fat milk consumption (p < 0.05). However, the initial drop in the salivary pH was found to remain above the critical level. For the high-protein milk group, salivary pH decreased slightly after 5 min but was similar to that at the baseline (p = 0.573). In the high-protein milk group (p < 0.05), the salivary pH was slightly greater than the baseline value at t.
The study shows an initial suggestion that milk is a non-cariogenic beverage, even when sugar is added. Furthermore, high-protein milk has a protective effect from dental caries.
本研究旨在评估3至5岁儿童饮用三种类型的牛奶后唾液pH值的变化。无效假设是在不同时间点，高蛋白、全脂和甜牛奶组之间的唾液pH值无统计学显著差异。
这是一项双盲、先导性随机对照交叉试验。30名儿童接受了三个实验阶段，中间有1周的洗脱期。每个儿童被给予250毫升以下类型的牛奶之一：高蛋白、全脂或甜牛奶。在饮用牛奶后5分钟（t）、10分钟（t）、15分钟（t）、30分钟（t）和60分钟（t）时，使用pH唾液试纸条在基线（t）测量唾液pH值。
饮用甜牛奶（P < 0.05）和全脂牛奶（p < 0.05）5分钟后，唾液pH值急剧下降。然而，发现唾液pH值的初始下降仍高于临界水平。对于高蛋白牛奶组，饮用5分钟后唾液pH值略有下降，但与基线时相似（p = 0.573）。在高蛋白牛奶组（p < 0.05）中，t时刻的唾液pH值略高于基线值。
该研究初步表明，即使添加了糖，牛奶也是一种非致龋性饮料。此外，高蛋白牛奶对龋齿有保护作用。
