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Crowns
Crowns are the restoration of choice when there is not enough tooth structure to support a filling.
Once a filling occupies 50% or more of the width of a tooth, a crown is indicated. Crowns surround the tooth bracing it together, whereas a large filling acts as a wedge, weakening the tooth.
Teeth with large fillings are prone to breaking or splitting.
You may need a crown for the following reasons:
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Your tooth has a large cavity.
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Your tooth has had root canal therapy.
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Your tooth has a large, weak filling.
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To replace a failing or unacceptable existing crown.
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For cosmetic improvement.
Crowns can be made of several different materials each of which may be indicated for different situations:
 
We used cosmetic all porcelain crowns to replace old porcelain baked to metal crowns on this patient. Note the dark lines along the gums on before picture. There is no dark line with all porcelain crown just as there is no line with all porcelain veneer
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