Examination method of buffer capacity of saliva and examination instrument of buffer capacity of saliva

摘要

To provide an examination method of buffer capacity of saliva and an examination instrument of buffer capacity of saliva, by which the buffer capacity of saliva of a subject can be examined simply without being influenced by an amount of saliva and preciously without being influenced by the subjectivity of an examiner, an end portion of an absorptive material in a predetermined shape, containing a pH indicator at least having one or more color transition range of pH 4.0 to 7.0 and an acid, is dipped in saliva to allow the saliva to penetrate into the absorptive material, and a buffer capacity of the saliva is examined from a distance where a color to be exhibited by the pH indicator has changed by the penetrated saliva from a predetermined place of the absorptive material and a distance where the saliva has penetrated from a predetermined place of the absorptive material. It is preferred that the absorptive material is an absorptive material having a property such that, when the absorptive material with a constant lateral cross-sectional area is made to stand upright to a water surface and its end portion of 10 mm is dipped in water, a penetration distance of water is from 10 to 200 mm under the conditions at a temperature of 23 DEG C and at a humidity of 50 % for 5 minutes; and that the acid contained in the absorptive material has a normality of 0.005 to 5.0 N.