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 shaped to fit a dental crown. After your tooth has been shaped, an impression will be made and sent to a dental lab for a crown to be made to your exact 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 a bridge instead of a single crown.