不同饮料对不同龋敏感儿童牙菌斑pH值的影响

Effects of Different Beverages on Plaque pH of Different Caries-sensitive Children

目的比较不同种类的饮料对龋敏感儿童及无龋儿童牙菌斑pH值的影响。方法采用微型蜂式pH指示电极原位测试儿童牙菌斑pH值。选择四川省成都市幼儿园3～5岁无龋儿童10名和龋敏感儿童10名作为研究对象,观察其饮用可口可乐、统一鲜橙多及乐百氏AD钙奶饮料后牙菌斑pH值的动态变化。结果无龋和龋敏感组儿童牙菌斑的静止pH值有统计学差异(P<0.05)。饮用饮料后,各组牙菌斑pH值均下降,约5～10min后达到最低值。无龋组儿童饮用3种饮料后pH最小值(pHmin)和pH下降幅度(△pH)均无统计学差异(P>0.05);龋敏感组儿童饮用3种饮料后pHmin、△pH则有统计学差异(P<0.05)。结论龋敏感儿童的牙菌斑产酸力较无龋儿童高。不同饮料对牙菌斑pH值的改变不同,其潜在的致龋能力存在差异。

Objective To compare the impacts of different beverages on plaque pH of caries-sensitive and caries-free children and to evaluate the applicability of in situ pH measurements in human dental plaque using Beetrode microelectrode. Methods The subjective population consisted of 20 children （aged 3-5 years）. Ten of them were caries-free （dmft=0）; the other were caries-active （dmft〉4）. The dental plaque pH were measured in situ with a pH microelectrode within I h after drinking three different beverages respectively. Then the resting pH value（pHrest）, minimum pH value （pHmin）, the range of the pH （ApH） was analyzed by ANOVA. Results There was a significant difference in pHrest between caries-free and caries-sensitive children. All the pH responses in the plaque following drinking three different beverages showed a classic Stephan-type response. The differences of the pHmin, ApH in sound sites were no statistic significance （P〉0.05） after drinking beverages in caries-free children. However the changes in the caries-sensitive group were more pronounced than the non-caries group. There were significant differences on the pHmin, ApH among different beverages（P〈0.05）, Conclusion The cariogenicity of plaque in caries-active children was stronger than that of the caries-free group. Different beverages have different potential cariogenicity.