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When a tooth had decayed excessively, has broken or is brittle due to previous treatments an artificial crown is often best to replace the damaged natural crown. This procedure takes two or three office visits. The choice of materials for the
Provided that the roots and bone structure that support the tooth are healthy and strong, a dentist can prepare the tooth for the crown by reshaping it to precise design principles to accommodate a crown.
If the foundation for a crown is too weak, root canal therapy is required so that a metal post may be placed in the root(s) for additional support. If however, the bone that supports the root of the tooth is too weak, the dentist may not recommend the placement of a crown at all, as the tooth may only last a few more years.
The crown must be carefully fabricated to fit the prepared tooth and also fit against the opposing tooth to ensure a correct bite. Accordingly the dentist, must take accurate measurements in the form of impressions of both jaws and the actual bite which the ceramic laboratory needs to work with. At the conclusion of the preparation appointment the tooth which is to be crowned is covered with a temporary crown made of acrylic or sometimes a soft aluminium in order to protect and stabilize it until the next appointment.
At the second visit, the dentist will check and fit the crown over the prepared tooth and if all is well, the dentist will cement it permanently. The durability of crowns depends on many factors but generally the structure of a crown is able to last a lifetime. However, it is common for crowns to need replacement after 20 years of service.
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