Crown - 3/4 Cast High Noble Metal - Dental Procedure Code Description
The term "crown" is used to describe the portion of your tooth that extends above the gumline - in other words, the portion of the tooth that can be seen in a healthy mouth. It is also used more colloquially to describe the dental procedure of having a prosthetic "crown" placed over a decayed, chipped, cracked, or otherwise damaged tooth.
With this dental procedure code, the prosthetic crown fitted to the tooth is completely constructed of high noble metal, but only covers 3/4 of the tooth's overall surface. A crown that includes high noble metal is designated as such because at least 60% of its composition is of the noble metals gold, platinum, palladium, and silver. Of that 60%, at least 40% of that percentage needs to be gold in order to earn this distinction from the American Dental Association. Noble metals are known to interact with human tissue well, and hold up to corrosion and oxidation better than other metals. The higher the percentage of noble metals, the less likely a crown is to corrode or oxidize.
In this procedure, the entire biting surface of the tooth is covered with high noble metal, along with a portion of the tooth that rests alongside the tongue. For cosmetic reasons, the healthy portion of the tooth that faces your cheek (and is visible when smiling), is left intact. At times, the top ridge of the crown that covers the biting surface may be seen in particularly wide smiles. Because a 3/4 crown only covers a portion of the tooth, less of the tooth needs to be removed, resulting in greater aesthetics while still benefiting from the strength of the metals used.
To prepare for this type of crown, a dentist will first remove any decayed or weakened areas of the tooth, and reduce its overall shape to accommodate the crown. A mold of your bite will then be made, so the custom crown can be fabricated off-site at a dental lab. If desired, a temporary crown can be fitted until the custom crown is completed.
Once the custom crown arrives at the dentist's office, any temporary crown used as a place-holder will be removed, and you will be fitted with the new crown.