Porcelain crowns, often referred to as caps, are one of the strongest long-term solutions used to restore a single tooth. It restores function and aesthetic to heavily repaired or broken teeth, and also helps to maintain the physical integrity of a tooth after root canal treatment. They are recommended where and when the use of conventional fillings as the final restoration will most likely result in failure. Crowns are highly aesthetic, and can be used on any teeth. Once bonded in place, a well maintained crown can last for well over 15 years. There are predominantly two types of porcelain crowns. Full ceramic crowns are used where aesthetics are a priority, and porcelain fused to precious metal crowns are used when extra strength is required.