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.
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.
- Florian Braun: Effectiveness of removing subgingival concrements from root surfaces when processing with Er: YAG laser radiation and detection by fluorescence spectroscopy. (PDF; 870 kB) Dissertation, Ludwig Maximilians University of Munich, July 2006.