When a tooth is heavily decayed or filled with filling material, it is more likely to fracture and lose considerable tooth substance. The greater risk is that a fracture line may go below the margin of the gum, which makes restoration more difficult or near impossible.
Crowns may be made from several different materials including gold, porcelain and metal, with metal and porcelain being the most common types.
Bridge: A bridge allows the dentist to replace lost teeth without the use of a denture or dental implant. To put it more simply, a false tooth is held in place by being attached to a tooth that sits alongside.
Post Crown: When the top of a tooth is lost due to decay there may be very little for the crown to hold onto. To gain ‘retention’ as dentists call it, a post is placed inside the tooth, which forms a peg on top of the tooth and acts as a seat for the crown. Post crowns have a shorter lifespan than normal crowns, as the roots may be brittle and weaker. Usually a post crown is a better option than having the tooth extracted with a subsequent denture or bridge.