### What is Post and Core? Post and core is a dental restoration procedure often performed after a root canal to save a tooth that has lost a significant amount of its internal structure. ### Why is it Needed? When a large portion of a tooth is removed, a post and core can help keep a dental crown in place. Dental crowns are placed on top of teeth to protect them from further damage or infection. ### The Procedure 1. **Root Canal**: During a root canal, the dentist removes the pulp-filled cavity inside the tooth. 2. **Post Placement**: A post is inserted into the canal where the root used to be. This post helps retain the core of the tooth. 3. **Core Build-Up**: The core replaces the missing tooth structure and supports the crown. ### Types of Post and Core There are two types of post and core procedures: 1. **Prefabricated Post and Core**: Usually completed in one appointment. 2. **Cast Post and Core**: Usually requires two appointments. ### When is it Recommended? A post and core procedure is recommended when more than 50% of the tooth's original structure is removed. If enough tooth structure remains, this procedure is not necessary. ### Pros and Cons **Pros**: - Helps retain the dental crown - Reconstructs missing tooth structure **Cons**: - Requires a root canal first - Not needed if enough tooth structure remains