Resting dental plaque pH values after repeated measurements at different sites in the oral cavity.

G F Huang, M K Guo
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Abstract

Plaque pH measurements can be used to detect individual's caries susceptibility and the cariogenic potential of ingested foods. However, repeated measurements with a touch electrode at a single site may affect the metabolic state of the dental plaque and result in changes of its inherent pH values. The purposes of this study were to evaluate the influence of repeated measurements of resting plaque pH values and to determine the pH values at different interdental sites. Eleven dental students participated in the study. The dental plaque was built up after thorough oral hygiene care. The subjects were then instructed to maintain a normal diet but to refrain from any oral hygiene care for the next 48 hours. Measurement of plaque pH was performed with an antimony electrode at 6 interproximal sites, including central spaces between the upper and between the lower central incisors, and the area between the second premolar and the first molar in each quadrant. At each tested site, measurements were taken 5 times at 0, 10, 30, 45 and 60 min. The results showed that the plaque pH became slightly alkaline at all the tested locations after repeated measurements. However, only the lower incisor area showed a significant change in pH values. Interdental plaque on the lower arch showed higher pH values than did that on the upper arch. There was no significant difference between the pH values on the right and left corresponding sites as determined using the Wilcoxon signed ranks test.

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在口腔不同部位反复测量后的静息牙菌斑pH值。
牙菌斑pH值测量可用于检测个体的龋易感性和所摄入食物的致龋潜力。然而,用触摸电极在单个位点重复测量可能会影响牙菌斑的代谢状态并导致其固有pH值的变化。本研究的目的是评估反复测量静息牙菌斑pH值的影响,并确定不同牙间位置的pH值。11名牙科学生参与了这项研究。牙菌斑是在彻底的口腔卫生护理后形成的。然后要求受试者在接下来的48小时内保持正常饮食,但不要进行任何口腔卫生护理。用锑电极在近端间的6个位置测量牙菌斑pH值,包括上切牙和下切牙之间的中心空间,以及每个象限第二前磨牙和第一磨牙之间的区域。在每个测试点,分别于0、10、30、45和60 min测量5次。结果表明,反复测量后,所有测试点的斑块pH值都呈微碱性。然而,只有下切牙区域的pH值发生了显著变化。下牙弓的牙间菌斑pH值高于上牙弓。经Wilcoxon符号秩检验,左、右对应位点的pH值无显著差异。
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