Sometimes a large piece of tooth falls off, a condition which cannot be treated with bonding. In such scenario remaining tooth may not take pressure of chewing and break further, to prevent this dentist can grind the remaining tooth and fix a crown over it.
If the defect lies in smile zone you can opt for an all ceramic crown otherwise options like full metal and porcelain fused to metal crowns are also available. This procedure may take 2-3 sitting and is expensive than bonding or filling. But this procedure will prolong the life of the remaining tooth and avert the need for extraction. If the entire top of the tooth is broken off but the root is still intact, the dentist or an endodontist (a dentist who specializes in root canals) may perform root canal therapy and place a pin or a post in the canal, and then build up enough of a structure onto which a crown can be made. Later, the dentist can cement the crown over the pin or post-retained restoration.