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Oral Health & Preventive Dentistry

Edited by Prof. Dr. Jean-François Roulet, Prof. Dr. Dr. Niklaus P. Lang, Prof. Dr. Palle Holmstrup

Official journal of the Academy of Minimally Invasive Dentistry, the World Congress of Microdentistry, and the European Society of Preventive Dentistry

ISSN (print) 1602-1622 • ISSN (online) 1757-9996


Summer 2008
Volume 6 , Issue 2

Pages: 159-164
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Course of Changes in Salivary pH-Values after Intake of Different Beverages in Young Children

Azrak, Birgül / Willershausen, Brita / Meyer, Nadja / Callaway, Angelika

Purpose: The aim of the study was to determine possible differences in decrease of pH-values of whole saliva, following the intake of different beverages. Materials and Methods: Twelve boys and 13 girls (4.9 ± 0.9 years old) participated in this study. A dental examination was performed (dmft). Orange juice (pH = 3.67), instant fennel tea (pH = 7.38), whole milk (pH = 6.84) and mineral water (pH = 5.88) were tested. All beverages were given at the same time of day. Salivary pH and buffering capacities of the beverages were determined with a portable pH-meter. Immediately after intake of a beverage, and 5, 10, 15 and 25 minutes later, whole saliva was collected, and the pH-value was measured again. The statistical evaluation was performed using the Wilcoxon test for paired samples. Results: Fifteen children had healthy dentitions. Ten subjects had a mean dmft of 1.1 ± 2.3. The mean base salivary pH was 7.09 ± 0.07, without differences between the children with and without dental decay. Mineral water led over the whole period of measurements to a significant rise in salivary pH (P < 0.05). Orange juice caused a significant reduction in the salivary pH during the first 10 minutes. After intake of instant tea or milk, significant reductions were found in the period of 5 to 10 minutes. After the intake of instant tea, the reduction was still significant after 15 minutes. During the period of 5 to 10 minutes, the change in pH (ΔpH) in whole saliva differed significantly only between consumption of mineral water and other beverages (P < 0.01). Conclusion: With regard to dental health, a regular consumption of orange juice or sweetened instant teas should be discouraged.

Keywords: children, instant tea, milk, orange juice, salivary pH

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