L. MORGAN / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY L. MORGAN / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Illustration of a premolar tooth prepared by a dentist for the fitting of a dental crown. The tooth has been filed down to a peg-shaped stump. A crown is an artificial cap that fits over the remaining part of a prepared tooth, strengthening it and giving it the shape of a natural tooth. Crowns are used to restore teeth that have been broken, or weakened by decay or large fillings.
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