DENTAL CROWNS IN SANTA CLARITA, NEWHALL, CA
Crowns (some times called caps), are coverings over the biting surface of the tooth.
They can be partial coverings or total coverings. The important point is to cover the part of the tooth that makes contact with its opponent the opposite arch. Crowns are needed when the amount of tooth structure has been compromised. This can occur by decay, breakage or endodontic treatment (a root canal). When the size of the filling approached one half of the biting surface of the tooth the remaining walls
are weakened and there becomes a good chance the tooth will fracture off one of the cusps. Crowns can be made of different materials for different applications.
Porcelain fused to metal crowns, are sometimes referred to as pfm’s. A pfm is composed of a thin metal shell that covers the tooth. Porcelain is then added to the
metal shell, creating the tooth’s structure and anatomy. They have been the staple of most crowns and bridges for years. The draw back to pfm’s is that the metal they are made out of is grey. We would like the finished product to be translucent like a natural tooth. While it can be done it is hard to mimic the translucency of nature with the underlying color being grey. Never the less they have given years of good service.
We now have porcelain crowns that are strong in there own right, and do not need
the strength of the under lying metal coping. There are three main categories of these new porcelains.
The first is called e-max, and is a lithium disilicate. These are the crowns that can be made while you wait in a dental office often made with a digital impression. They can be very esthetic. They are usually bonded to the tooth, which increases their strength.
A similar crown can be made of leucitite-reinforced glass-ceramic it is called an empress crown. This too can be milled in the dental office with a digital impression. It is very esthetic, but not as strong as the e-max crowns. It too is bonded to the tooth.
The gorilla in the room is the zirconium oxides. It can be used by itself for a crown
But is not as esthetic as the above two. It can also be used as the metal coping with
Other prettier porcelains layered on top of it getting rid of the grey base Its strength is around 1200 Mpa’s
Compared to e-max at 400, and empress at 100 MPa’s
A Prosthodonist can further discuses which is better for you