A crown is a type of dental restoration used to restore weak teeth. Crowns are often needed when a large cavity threatens the ongoing health of a tooth. They are typically bonded to the tooth using dental cement. Crowns can be made from many materials, & are usually fabricated in a lab.
Crowns can be all porcelain, all gold or porcelain fused to gold. Gold is the strongest & longest lasting material. It can last twice as long as other materials. Porcelain fused to metal (PFM) is strong & has been proven over many years. All-porcelain crowns have been around for many years but have become the material of choice in last few years due to the improvements in material sciences & dentistry.
Crowns require two or more appointments. At the first appointment, precise drilling is done, impressions are taken to make plaster models & a temporary crown is placed. The permanent crown is fabricated in a dental lab. At the second appointment, the permanent crown is tried in the mouth & cemented in the mouth.