Hi:There are three options to do a root canal once a crown is cemented:1. Try to remove the crown without damage: unlikely possiblity2. Go through the crown. Most likely and least invasive3. Go through the gum and the bone to get to the bottom of the tooth (Apicoectomy). Most invasive.Best,Dr. Maddahi
Yes, there is. It is call an apicoectomy. This procedure is a surgical procedure through you gum and bone to get to the root. I only recommend this procedure after the standard root canal through the tooth (crown) is performed. It is far more conservative to go through the crown than gum and bone. Usually crowns can last for years even with a filling in the hole of the crown.