Single crowns on the natural teeth are usually done to stop cracks on the teeth and sensitivities that results from the cracks, or to protect the teeth from fracturing and seal the teeth after root canal therapy.  Though crowns can be done on the teeth without the existing root canal treatment, we highly recommend that any tooth that may be undergoing the crown treatment be treated with root canal therapy first.  The scientific studies and practice of the dentistry over the years by all dentist have shown that any teeth that has undergone crown treatment without a prior root canal always end up needing the root-canal treatment.  This is due to the fact that the procedure of making a crown cause unavoidable stress to the pulp (nerve) inside the tooth, more so than when a tooth is receiving a filling.  The nerve then slowly dies over time without the person being aware of it. Then one day the person may notice a sudden intensive pain.  If the root canal has to be done after the crown is already on the tooth, the crown will have to be replace after the root canal especially if a lot of crown structure is lost during the root canal therapy.  How much crown structure will be lost during the root canal depends on the actual anatomy and location of the nerve at that time. 

Fixed Bridgework (Attached Multiple Crowns) Bridgework can be used to replace one of more missing tooth space.  The advantage is that the space will be restored with the type of bridge that can be cemented (glued) in so that one does not have to remove the bridge before bedtime like the Removable Partial Dentures.  The disadvantages include having to cut down on the nearby teeth to be able to put a bridge.