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目的 本实验通过检测６４ 名１３ 岁左右正畸与正常儿童的龋活性，以了解矫治与龋活性的关系。方法 检测方法包括变链菌菌落数的测定、菌斑产酸能力的测定和唾液缓冲能力试验，用团体 Ｔ 检验的方法进行统计。结果 正常儿童组口腔内变链菌数目明显少于正畸儿童组，而唾液ｐ Ｈ 值明显大于正畸儿童组，统计学上有显著性差异（ Ｐ＜ ０ ．０１） 。两组之间菌斑产酸能力无统计学显著性差异。正常儿童组唾液缓冲能力虽然高于正畸儿童组，但两组之间也无显著性差异（ Ｐ＜ ０ ．０５） 。结论 结果提示正畸儿童对龋病的易感性增加。
Objective The purpose of this experiment is to detect the caries activity of 64 children aged 13 and over to understand the relationship between correction and caries activity. Methods The method of detection included Streptococcus mutans colonies number determination, plaque acid production ability test and salivary buffer capacity test, using the method of group T test statistics. Results The number of S. mutans in normal children group was significantly less than that in orthodontic children group, while the salivary pH value in saliva group was significantly higher than that in orthodontic children group. There was a statistically significant difference (P <0.01). There was no statistically significant difference in the ability of bacteria to produce acid between the two groups. Although the saliva buffering capacity of normal children group was higher than that of orthodontic children group, there was no significant difference between the two groups (P <0.05). Conclusion The results suggest that orthodontic children have an increased susceptibility to dental caries.