Procedure whereby a tooth is covered to strengthen a damaged tooth. The tooth may have been damaged by decay, or have a previous restoration that has fractured. Root canalled teeth are also crowned if sufficient tooth is missing or if the dentist feels that the tooth will last longer by protecting it with the crown. There are several types of crowns. The dentist and patient will make the decision as to which one is best for the patient. This involves several phases. One in which the dentist prepares the tooth and a temporary crown is fabricated and used to temporize the tooth while the crown is being processed in a dental laboratory. The second step is inserting the permanent crown. Failing to return to have the permanent crown placed can cause damage to the underlying tooth due to weakness and poor fit of the temporary crown.