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Dental Crowns and Bridges
Jun 14, 2019| 
A crown (often referred to as a “cap”) is typically used to restore a tooth that is too badly decayed, broken or cracked to be restored with a filling. The existing tooth is reshaped, removing the damaged or diseased portion, and a crown shaped to resemble a real tooth is placed over top.
Crowns and Bridges: Besides being used to restore damaged teeth, crowns are needed for teeth that have had root canals.
They are also placed on dental implants to replace missing teeth. Crowns traditionally have been made entirely of gold or porcelain that is fused to a gold substrate for extra strength. While these are both excellent approaches, new technology allows for crowns to be made entirely from high-strength ceramic and porcelain which enables better color matching to existing teeth and, in many cases, can be done in one visit instead of two.
Why are dental crowns needed?
Badly decayed teeth.
Fractured or chipped teeth.
A missing tooth (or teeth).
To cover a dental implant.
Desire for a more permanent solution than dentures.
Correcting the “sunken face” look associated with missing teeth.
Dental Bridges
As the word implies, a “bridge” literally bridges the gap created by one or more missing teeth. A bridge is comprised of two crowns for the teeth on either side of the gap and a false tooth (or teeth) in between. These false teeth are called pontics and can be made from gold, alloys, porcelain or a combination of these materials. The resulting dental bridge is supported by natural teeth or implants.
Bridges are needed not merely for cosmetic reasons, but because a missing tooth can cause serious problems with shifting teeth. A gap between your teeth can also make it difficult to chew and speak clearly—particularly when teeth are missing in the front or rear of your mouth.
Types of dental bridges:
1.Traditional bridges
Are the most common. A crown is made for the tooth (or implant) on either side of the missing tooth, with a pontic (false tooth) in between. Material used is either porcelain fused to metal or ceramic.
2.Cantilever bridges
Are used when there are adjacent teeth on only one side of the missing tooth (or teeth). The process and materials are similar to those used in traditional bridges.
3.Maryland bonded bridges
Are made of plastic teeth and gums supported by a metal framework, Metal wings on each side of the bridge are bonded to the existing teeth on either side.
4.Zirconia bridges
Are made from Zirconium oxide, an extremely tough dental ceramic. Compared to conventional bridges, there is less tooth sensitivity, no gray coloration around the edge of the gums, and no problems with allergic reactions.