Prosthodontics & Occlusion · single question
What is the purpose of a FERRULE in a crown restoration?
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Correct answer: B. Ferrule provides resistance to root fracture by encircling remaining tooth structure
✓ B) Ferrule provides resistance to root fracture.
FERRULE = circumferential band of crown material that encircles the external dimension of remaining coronal tooth structure. Minimum: 1.5–2mm of tooth structure above the finish line (ferrule height). Function: resists root fracture by distributing stress from the post-core-crown system onto the tooth structure. 'Dowel is for RETENTION of core; FERRULE is for RESISTANCE to root fracture.' Without adequate ferrule: any lateral force on the crown → splits the root. The ferrule effect is THE most critical factor for long-term success of endodontically treated crowned teeth.
FERRULE = circumferential band of crown material that encircles the external dimension of remaining coronal tooth structure. Minimum: 1.5–2mm of tooth structure above the finish line (ferrule height). Function: resists root fracture by distributing stress from the post-core-crown system onto the tooth structure. 'Dowel is for RETENTION of core; FERRULE is for RESISTANCE to root fracture.' Without adequate ferrule: any lateral force on the crown → splits the root. The ferrule effect is THE most critical factor for long-term success of endodontically treated crowned teeth.
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