Endodontics · single question
What is the primary purpose of a dental post (dowel) in an endodontically treated tooth?
Show answer and explanation
Correct answer: B. Increase the retention of the core buildup
A dental post (dowel) is placed to retain the core buildup when insufficient coronal tooth structure remains. It does NOT strengthen the root — in fact, posts can weaken roots (risk of root fracture from stress concentration). The ferrule effect (2mm of dentin above the margin encircled by the crown) is what resists root fracture — NOT the post. Dowel = retention of core; ferrule = resistance to fracture.
- A. ❌ The ferrule effect (circumferential band of tooth structure above the crown margin) resists root fracture — not the post itself.
- B. ✅ CORRECT – The primary function of a post is to retain the core buildup in a tooth with minimal remaining coronal structure.
- C. ❌ Posts do not replace pulp function.
- D. ❌ Posts do NOT increase root strength — they actually increase fracture risk when poorly placed.