A post and core buildup is a restorative dental procedure that reconstructs a severely compromised tooth following endodontic treatment, providing the internal retention and coronal geometry necessary to support a definitive restoration such as a dental crown.
Why a Post and Core Buildup Is Needed
Root canal therapy removes pulp tissue but also requires coronal access, often leaving behind minimal dentin and enamel. When the remaining tooth structure is insufficient — typically less than half of the original crown height — a post and core system replaces what was lost, enabling the tooth to be reliably restored rather than extracted.
Components of the System
- Post: A rod cemented into the prepared root canal space; materials include prefabricated fiber-reinforced resin (fiber post), metal alloys, or custom cast posts.
- Core: A buildup material — most commonly composite resin, glass ionomer, or amalgam — sculpted around the post to restore proper tooth form and height.
- Ferrule: The circumferential band of sound natural tooth structure that encircles the core at the crown margin; an adequate ferrule of 1.5–2 mm is critical for fracture resistance and long-term crown retention.
Clinical Procedure
The clinician first confirms radiographically that root canal obturation is complete, then removes a controlled portion of the gutta-percha fill to create the post space while preserving an adequate apical seal. After the post is cemented with a resin-based luting agent, core material is built up to recreate ideal tooth geometry. The tooth is then prepared and an impression or digital scan is taken for definitive crown fabrication.
Material selection depends on the tooth’s position in the arch, remaining root length, esthetic requirements, and occlusal loading. Fiber posts are widely favored because their modulus of elasticity more closely approximates dentin than metal, distributing stress along the root and reducing the risk of catastrophic vertical root fracture — a factor especially important for anterior teeth and premolars subject to lateral forces.
A well-executed post and core buildup preserves a structurally weakened tooth and provides the stable, retentive foundation that allows it to withstand the demands of normal occlusion for many years.