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口内牙齿表面菌斑的原位pH既能反映细菌代谢产酸的能力,也反映局部环境缓冲和转运酸的能力。本研究使用钯-微触电极测量龋活跃者(CA)和无龋者(CF)在用10％蔗糖溶液漱口前后菌斑的原位pH,以评价原位pH测定在判断个体龋易感性中的作用。结果表明,龋活跃组菌斑pH在漱糖前后各时间点均较无龋组低;龋活跃组与无龋组在漱糖后菌斑下降的最低pH相近,但龋活跃组菌斑pH回升速度慢,导致低pH水平持续时间长。上颌牙菌斑pH水平较下颌牙菌斑pH水平低,而左右侧牙菌斑pH水平大致相同,提示唾液在维持菌斑pH水平中的主导作用。
The in situ pH of dental plaque on the surface of the oral cavity reflects both the ability of the bacteria to metabolize the acid and the ability of the local environment to buffer and transport the acid. This study used a palladium-microelectrode to measure the in situ pH of plaque before and after gargling with 10% sucrose solution on carious active caries (CA) and caries-free (CF) to assess in situ pH measurements in determining caries susceptibility In the role. The results showed that the plaque pH value of the active caries group was lower than that of the caries-free group at each time point before and after the gargle, while the lowest pH value of the plaque drop in the caries-active group and the caries-free group was similar, Slow, resulting in long duration of low pH levels. The level of dental plaque in maxillary plaque was lower than that in dental plaque and the plaque pH was about the same in left and right plaque, suggesting that saliva plays a leading role in maintaining plaque pH.