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Dental crowns/Caps/Bridge..

Dental crown restores the tooth to its normal shape, size, and function. Reasons you may need a crown:You have a cavity that is too large for a filling You have a tooth that is cracked, worn down, or otherwise weakened Post root canal treatment You want to cover a discolored or badly shaped tooth and improve your smile .Bridges and crowns are fixed prosthetic devices that are cemented onto existing teeth or implants, by a dentist or prosthodontist. Crowns are used most commonly to entirely cover or "cap" a damaged tooth or cover an implant. Your dentist may recommend a crown to:A crown can also be placed on top of an implant to provide a tooth-like shape and structure for normal oral function. Porcelain or ceramic crowns can be matched to the color of your natural teeth. Other materials include gold and metal alloys, acrylic and ceramic. These alloys are generally stronger than porcelain and may be recommended for back teeth. Porcelain fused to metal is often used because it is both a strong material and attractive in its appearance. A bridge is mounted onto a space where teeth are missing and is attached onto a tooth or implant. These teeth, called abutments, serve as anchors for the bridge. A replacement tooth, called a pontic, is attached to the crowns that cover the abutment. As with crowns, you have a choice of materials for bridges. Your dentist can help you decide which is best for you, based on the location of the missing tooth (or teeth), its function, aesthetic considerations and cost.



Types of crowns:

Stainless steel ..

crowns are prefabricated crowns that are used on permanent teeth primarily as a temporary measure. The crown protects the tooth or filling while a permanent crown is made from another material. For children, a stainless steel crown is commonly used to fit over a primary tooth that's been prepared to fit it.

Metals:

used in crowns include alloys that have a high content of gold or platinum, or base-metal alloys (for example, cobalt- chromium and nickel-chromium alloys). Metal crowns withstand biting and chewing forces well and probably last the longest in terms of wear down. Also, metal crowns rarely chip or break. The metallic color -- and the high price of gold -- is the main drawback. Metal crowns are a good choice for out-of-sight molars.

Porcelain-fused-to-metal :

dental crowns can be color matched to your adjacent teeth (unlike the metallic crowns). However, more wearing to the opposing teeth occurs with this crown type compared with metal or resin crowns. The crown's porcelain portion can also chip or break off. Next to all-ceramic crowns, porcelain-fused-to-metal crowns..

All-ceramic or all-porcelain

dental crowns provide better natural color match than any other crown type and may be more suitable for people with metal allergies. All-ceramic crowns can be used for front and back teeth.