乳牙菌斑液pH值与患龋状况及摄糖频率的关系

The relationship between the pH of dental plaque fluid in the primary teeth and caries status,sugar exposure frequency

目的分析乳牙菌斑液pH值与患龋状况及摄糖频率之间的关系。方法将93名北京城区3～5岁儿童，根据患龋情况分为重症婴幼儿龋（Severe Early Childhood Caries，S—ECC）组47名，dt≥5；无龋（Caries Free，CF）组46名，dmft=0。分别收集集合菌斑，应用离子选择性微电极法测定受试者乳牙菌斑液pH值，并进行组间比较；对两组受试者每日摄糖频率进行调查，分析菌班液pH值与摄糖频率的关系；并在S—ECC组分析菌斑液pH值与dt的关系。结果S—ECC组菌斑液pH均值低于CF组，差别有统计学意义；S—ECC组患儿每日摄糖频率高于CF组；乳牙菌斑液pH值与摄糖频率呈负相关关系；S—ECC组菌斑液pH值与dt相关（P〈0、05）。结论乳牙菌斑液pH值与摄糖频率呈负相关关系，并且S—ECC组儿童与CF组儿童相比，其菌斑液有更大的致龋潜能。

Objective To analyze the relationship between pH of dental plaque fluid in the primary teeth and caries status, sugar exposure frequency. Methods Subjects were 93 of 3 - 5 years old children lived in Beijing area. According to their caries status, they were classified into two groups： severe early childhood caries group, dt≥5, n= 47; caries free group, dmft = 0, n = 46. Plaque samples were collected from subjects respectively. Micro- electrode technique was used to test pH of dental plaque fluid. The information of daily sugar exposure frequency of children was obtained from a standardize questionnaire filled by their parents. The relationship between pH of dental plaque fluid and daily sugar exposure frequency was analyzed, the relationship between pH of dental plaque fluid and dt in the S- ECC group was also analyzed. Results The mean value for pH was lower in the S- ECC group, the difference between mean values was found to be statistically significant（ P 〈 0.05）. There was an inverse relationship between pH of dental plaque fluid and sugar exposure frequency in primary dentition. In the S- ECC group, there was an inverse relationship between pH of dental plaque fluid in the primary teeth and dt value. Conclusion There was an inverse relationship between the pH of dental plaque fluid and sugar exposure frequency in primary dentition. Dental plaque fluid from the S- ECC group shows a stronger cariogenic potential than that from the CF group.