Interdental plaque pH, recorded in six volunteers during and after rinsing for one, two, four, eight, and two x four min with 15 ml of a 7.3 mM (0.25%) sucrose solution, declined continuously the longer the substrate was in contact with the plaque. The addition of a sticky, non-fermentable substrate to powdered sucrose significantly increased the acidogenic response of interdental plaque.
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