Measurement of Human Plaque Acidity: Comparison of Interdental Touch and Indwelling Electrodes

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Abstract
The pH of human dental plaque following ingestion of five reference foods was monitored for 120 min in 4 subjects using an interdental metal-metal oxide touch microelectrode concurrently with a glass indwelling interproximal electrode mounted in a removable acrylic partial denture. Time that pH remained given values, and time-pH unit area under these lines provided more separation among foods than did minimum pH or pH drop. Data obtained after 60 and 120 min gave similar results in terms of significant ordering of reference foods for the touch, but not the indwelling electrode system. The indwelling system detected a significantly greater magnitude and duration of pH fall after ingestion of all foods. However, ordering of an discrimination between pH falls induced by the foods was similar in both electrode systems.