What does the Snyder test estimate the count of?

The Snyder test is specifically designed to estimate the count of oral lactobacilli, particularly Lactobacillus acidophilus, which is a significant indicator of dental caries activity. This test involves using a special medium that, when inoculated with saliva, allows for the growth of lactobacilli. The medium is typically a glucose-containing agar that is acidic in nature, encouraging the growth of these bacteria while inhibiting others.

The lactobacilli ferment the glucose, producing acid that can change the color of the medium, thus indicating the level of bacterial activity. A change in color demonstrates the presence and activity of these microorganisms, helping to evaluate an individual's susceptibility to dental caries and providing insight into oral health status. The result of the Snyder test can therefore be used to assess both the quantity of lactobacilli present and the potential risk for developing dental caries.