Ferrule Definition — ORE Part 1 MCQ
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Correct answer: D — A circumferential band of sound coronal tooth structure engaged by the crown
Explanation lettering: D = shown as A · E = shown as B · B = shown as C · A = shown as D · C = shown as E
A ferrule is the circumferential band of remaining sound coronal tooth structure that is encircled and engaged by the crown. It braces the tooth–core complex and improves resistance to functional loading and fracture; clinically, a continuous ferrule of approximately 1.5–2 mm is commonly sought where feasible. B is the post, which lies within the root canal and principally helps retain a core rather than constituting a ferrule. C is the post’s luting cement. D is the core, which replaces missing coronal structure but is not residual tooth tissue. E describes an occlusal contact, unrelated to the cervical tooth structure engaged by a crown.
Reference: Mamoun JS. On the ferrule effect and the biomechanical stability of teeth restored with cores, posts, and crowns. European Journal of Dentistry. 2014. https://pubmed.ncbi.nlm.nih.gov/24966784/