Crowns And Bridges
There are many types of dental crowns available; dental crowns are made of metal, ceramic or a combination. Each type of crown comes with specific advantages and disadvantages which must be considered before arriving at a final decision. Several factors contribute to choosing the right crown including patient health, location in the mouth and patient habits.
The most common metal dental crown is made of gold alloy. Depending on the composition of the alloy, the resulting crown may be yellow or silver in color.
Metal crowns are extremely durable. They are commonly made of a gold alloy which is easy to work with, making it easy for the dentist and the dental lab to create a good fit. Gold crowns will not chip and are very unlikely to break. Their wear rate is very similar to that of a natural tooth, making them a good choice for a tooth that will be abutting against a natural tooth during chewing. A disadvantage of the all-metal crown is appearance. Because of this, metal crowns are commonly placed on back teeth only.
All ceramic crowns are most commonly manufactured from porcelain. Because of their translucency, all-ceramic crowns are a preferable choice for top, front teeth. Although aesthetically pleasing, all ceramic crowns are not as durable as metal crowns. If the restoration is of a primary chewing tooth or if the patient has a history bruxism, an all-ceramic crown may not be the best choice.
Combination of Metal and Ceramic
When both strength and beauty are required, a combination of both metal and ceramic may be the best choice. If used for a molar, the metal crown may be wrapped in a porcelain veneer. The metal portion of the crown will still be visible at the gum line and on the chewing surface
A second option is to use a porcelain-fused-to-metal crown (PFM). The crown is first crafted out of metal and then covered in porcelain. The biting surface of the crown is made of porcelain and is matched to the patient’s bite.
A dark line maybe visible around the outer edge of the crown and the porcelain may chip. If the porcelain of the crown chips, the entire crown will require replacement. The porcelain surface of the crown may also cause wear to the teeth on which is mates during chewing.
Choosing the right dental crown must be done after careful research and consultation with a trusted dental professional.