JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Impacted canine tooth. Coloured computed dental radiograph (CDR) of an impacted upper canine tooth with extensive bone loss. The impacted tooth (brown at top) has not emerged through the gum at its usual time of eruption. It has become embedded in the bone (green, upper frame). The gums of the mouth have become diseased (gingivitis). Here, advanced gingivitis has caused the underlying bone to be eroded leaving the teeth (lower frame) with part of their roots exposed. This loosens the teeth. Computed dental radiography is a new (in 1997) X-ray technique that uses little radiation, requires no film and allows instantaneous viewing of the coloured image on a computer monitor.
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