Tuesday, 17 December 2013

Dental Crown


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A crown is a type of dental restoration which completely caps or encircles a tooth, restores shape and size, strength, and improves its appearance. When a large cavity threatens the ongoing health of a tooth, crowns can be fully encased the entire visible portion of a tooth that lies at and above the gum line. Crowns are bonded to the tooth by dental cement. Crowns are often used to improve the strength or appearance of teeth and can be made from many materials using indirect methods. The indirect method allows use of intense restorative materials requiring time consuming fabrication methods requiring intense heat, such as firing porcelain. In this method, with dental impression of a prepared tooth, dentist fabricates the crown outside of the mouth, and then the crown can be inserted at a subsequent dental appointment. As new technology, CAD or CAM density is a part of crown and bridge fabrication. Metal (for example gold), porcelain fused to metal and ceramic are some types of crowns. Gold crown is one type of the crowns that is popular because of the relatively similar costs and the aesthetic benefits. For back teeth, the all-metal or PFM crowns are better choices, than ceramic crowns. The other benefit of all-metal or PFM is color that is same as natural teeth, and look just like teeth. Crowns are usually durable and last at least seven and even much longer. Up to 40 years or so!


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