;Caption: Oral bacterium - Streptococcus mutans. S. mutans is a coccoid shaped, Gram-positive, facultative anaerobic bacteria that is part of the normal bacteria flora of the mouth. It can thrive in temperatures ranging from 18-40 degrees Celsius. It metabolizes sucrose to lactic acid and is a leading cause of tooth enamel decay. The acidic environment created in the mouth by this process is what causes the highly mineralized tooth enamel to decay. S. mutans is one of a few specialized organisms equipped with receptors for adhesion to the surface of teeth. Sucrose is utilized by S. mutans to produce a sticky, extracellular, dextran-based polysaccharide (glucan) that allows them to adhere to each other forming plaque. Other sugars (glucose, fructose, lactose) can be digested by S. mutans to produce lactic acid. It is the combination of plaque and acid that leads to dental decay.
Magnification*: x4,400
Type: SEM
Copyright 2006 Dennis Kunkel Microscopy, Inc.
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