مقایسه اثر آدامس بدون قند حاوی بی‌کربنات و آدامس بدون قند معمولی بر بزاق و بزاق تحریکی دهان

 Introduction: One of the most expensive and prevalence of chronic diseases is dental caries. In etiology of the dental caries, four factors: 1) carbohydrates, 2) Bacteria, 3) the decrease of pH and 4) host resistant time have been considered. Oral saliva has an important and main role in wetting of oral cavity and controlling of the four factors. The factor of pH and rate of saliva affect the growth and the effect of bacteria on carbohydrates. Therefore, increasing of pH of the saliva is the important factor in controlling dental caries. In the literature, It has been seen That sugar – free sodium bicarbonate containing chewing gum increase the pH of saliva so we evaluate this idea in this research. Objective: The aim of the present study is to compare the effects of conventional sugar-free chewing gums and sugar free sodium bicarbonate chewing gum and their effects on salivary PH that which is wanted to enhanced salivary pH through the usage of these 2 kinds of chewing gums specially containing bicarbonate being a cheep way to protect dental caries.  Materials and Methods: Sixty volunteers, 60% male and 40% female were selected. After unstimulated, saliva was collected, from chewing either a standard or bicarbonate containing gum and 30 min after finishing the chewing. The salivary pH was measured with pH meter for each sample and was measured for stimulated saliva after 30 min of chewing the gums. Statistical analyses used in this research were:1) paired t – test and 2) analysis of variance (ANOVA). Results: With the standard sugar free gum, the mean peak salivary pH was 7.12 with the bicarbonate gum the peak salivary pH was 7.50. The increase in salivary pH was greater for the bicarbonate gum and there was not any significantly difference for the mean peak of stimulated saliva between two groups.  Conclusion: The increasing in salivary pH with bicarbonate chewing gum can have implications for oral health and prevention of dental caries. It should be evaluated in longitudinal studies and long – term follows.