2215 Plaque and saliva pH pre and post toothbrushing
F. SCHAFER1, J.A. NICHOLSON1, P. ABRAHAM1, T. COX1, J. HOLT2, D. GILLAM3, E. WEADER3, and D. SAVAGE3, 1Unilever Oral Care, Bebington, United Kingdom, 24-Front Research Ltd, Capenhurst, United Kingdom, 34-Front Research Ltd, Chester, United Kingdom

Objective: To measure the correlation between plaque and saliva pH before and after tooth brushing measured with a standard pH meter and a new saliva test strip. Method: Two studies were carried out. In study 1, subjects were asked to refrain from brushing their teeth for 24h. Then, plaque and saliva samples were taken and subjects brushed their teeth with a fluoride toothpaste. Further plaque and saliva samples were taken 5 min and 10 min after brushing. The pH of the samples was measured immediately after collection using a standard pH electrode. In addition, saliva pH was also determined with a new saliva test strip and a colour reference scale. Study 2 was identical to study 1 but samples were collected about 1.5 min and 4 min post brushing. Study 1 was completed by 25 subjects and study 2 by 20 subjects; study participants were male and female healthy adult volunteers. Subjects carried out the experimental procedures twice in both studies. Results: Saliva pH after tooth brushing increased significantly by a mean value of 0.5 pH units (after 1.5 min, measured by pH meter), p<0.001. This was mirrored by the findings obtained with the saliva test strip (pH change: 0.6 units), p<0.001. Significant correlations (p<0.05) were found between the readings obtained with the saliva test strip and the pH of saliva and plaque measured with a pH meter. Conclusion: Changes in oral pH can be monitored using a new saliva test strip. The reading obtained with the strip showed significant correlations with saliva and plaque pH.

Seq #230 - Diagnosis of Salivary Disorders
10:15 AM-11:30 AM, Friday, 12 March 2004 Hawaii Convention Center Exhibit Hall 1-2

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