The same tooth #20. If it had already been endodontically treated, what should be done next?

Correct answer: A. Post, core, and crown

• A. Correct. An endodontically treated posterior tooth with significant loss of structure typically needs a post (for retention in a compromised tooth), a core build-up, and a full-coverage crown to protect it from fracture.
• B. A core and crown may suffice when adequate coronal tooth structure remains, but with extensive loss a post is indicated for retention.
• C. Extraction is unnecessary if the tooth is restorable.
• D. An endo-treated tooth needs definitive coronal restoration; doing nothing risks fracture.