Dental filling polymerisation. Artwork of a cross-section of a human tooth, with a filling (white) being set using an ultraviolet light lamp tool. The pink light seen is used to guide the dentist, as the ultraviolet light is not visible. The ultraviolet light provides energy to break chemical bonds, causing the filling to set. The cross-section shows the tooth's internal anatomy, including the living tissue of the pulp (red) in the tooth's core and its roots (bottom). Within the pulp are venous (blue) and arterial (red) capillaries (small blood vessels), as well as nerves (orange). The filling replaces areas of the tooth lost to dental caries (tooth decay).
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