Root canal – Root canal treatment leaves the tooth hollowed out and predisposes the remaining tooth to cracking. So, a tooth that has had a root canal almost always needs to be restored with a crown immediately to prevent it from fracturing.
Large filling – When a tooth has a cavity or fracture that involves half the width of the tooth or more, it needs to be covered with a crown.
Cracked tooth syndrome – when a patient has fractures inside a tooth that cause pain. A crown will hold the tooth together and redistribute the stress evenly throughout the tooth, eliminating the pain in most instances.
Broken cusps – Cusps frequently break off of teeth due to trauma or large existing fillings. Since the cusps are the part of the tooth that take the most stress during chewing, they need to be completely covered or the tooth or filling will keep fracturing.
Excessive wear of teeth – grinding teeth, acid erosion (typically caused by acid reflux or bulimia),
Undesirable appearance of teeth – unacceptable appearance due to color, shape, or spaces between teeth