The ferrule effect
Stankiewicz, N.; Wilson, P.
Dental Update 35(4): 222-4 227-8
2008
ISSN/ISBN: 0305-5000 PMID: 18557498 Document Number: 615432
When the supra-marginal dentine of a root-filled tooth is engaged by a crown, it may create a stronger tooth/restoration complex. This has been termed the ferrule effect. This paper reviews the current evidence for this effect and examines the influence various post and core materials have on it. Means of achieving a ferrule are discussed and the importance of planning for failure is considered. Provision for the ferrule effect when restoring root-filled teeth with a post-retained crown may optimize the strength of the restored tooth.