[In vitro experiments on plaque formation].

The mechanisms contributing to plaque formation have still not been adequately explained. An attempt therefore was made to form plaque in vitro in order to acquire a model for the processes and what influences them. Plaque forms in various stages, analogous to the natural condition when saliva and microorganisms are present on the surface of the teeth. Microorganisms from plaque formed in situ demonstrate a decreased ability for adhesion and cohesion when compared with free salivary microorganisms. Sucrose encourages more rapid and thicker plaque formation.