Crowns
Crowns are full coverage restorations that are used to cover a tooth that is likely to break, or is too broken down to be restored with a filling.  They are most commonly done after root canal treatment, or when a large filling wears out.  The larger hole made by a cavity that has to be treated, the more likely a crown will be needed.  Even after filling is put in a large cavity, a tooth is more likely to break.  Keep in mind that the jaw muscles are the strongest in the human body.  Teeth are subjected to tremendous pressures.  Crowns ride over the weekend tooth, providing strength and protecting the tooth against breakage.  A broken or cracked tooth is a far more serious matter and much more difficult to treat.  Crowns prevent this, as well as making for a nice smile.  
It takes two appointments to restore a tooth with a crown. In the first, any decay is removed from the tooth and it is shaped to accept the crown.  Then an impression is made of the tooth for use in fabricating a crown.  Between the two visits the crown is made, usually of high-strength porcelain over metal alloy, all ceramic material, or gold.  During this time a temporary crown is worn.  In the second visit, this temporary crown is removed and the permanent crown is adjusted as needed then cemented into place.
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