MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Dental X-ray. X-ray of a man's full set of teeth showing repairs, including crowns (one seen at left), post crowns (one seen at right) and fillings (two seen at top right). Crowns are a type of dental restoration that cover the visible part of a tooth. When supported by a metal peg drilled into the tooth they are known as post crowns.
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