A crown is a cap that is made from various materials used to cover and protect a tooth that has been heavily decayed or damaged. A crown is structurally stronger and will last longer than most fillings. A bridge is multiple crowns connected together to fill in the area of a missing tooth or teeth.
During a crown. appointment, all decay will be removed and the tooth will be specifically shaped to fit a dental crown. After your tooth is shaped, an impression will be made of the tooth and sent to a dental lab for a new crown to be made to your measurements. A temporary crown will be made for you until the permanent crown is received.
The same process will be done during a bridge procedure except the end result will be to replace a tooth/teeth in addition to capping the adjacent teeth.