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Concrete , also stone (e) , is a medical term that describes a deposit in the form of a solid mass that is formed by previously dissolved substances remaining in a hollow organ or in a body fluid.

Concrements are, for example, gallstones , urinary stones , kidney stones , vaginal stones and salivary stones . Goiter stones can also occur in birds .

In dentistry , dark, hard deposits on the root surface are referred to as calculus. It is formed from the secretion of the gingival pockets and can be distinguished clinically from tartar mainly by its color. Because of the chronic inflammation (chronic periodontal disease ) that such a build-up in the pocket causes, light bleeding occurs repeatedly. The blood components are deposited in the concrement and ensure the characteristic brown-black color. This composition makes concrement stronger than tartar and therefore more difficult to remove.


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