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Ferrule Effect

Ferrule Effect

[Ferrule Effect 


The term ferrule is derived from the combination of the Latin words for iron (Ferrum) and bracelets (Viriola) from (Brown 1993).  The ferrule effect * barrel hoop effect * is right as the 360-degree metal collar of the crown, which surrounds parallel structures of the dentin and is coronal to the preparation margin.

The result of these preparation designs is a strengthening of the form of resistance of the crown through the elongation  of the tooth structure (Sorensen JA, Engelman).

Teeth with 1.5 and 2 mm ferrules show significantly better survival rates than teeth with 0.5 and 1 mm ferrules (Libman & Nicholls 1995).


  1. Brown L, ed. (1993The New Shorter Oxford Dictionary on Historical Principles. Oxford, UK: Clarendon Press. 223.
  2. Sorensen JA, Engelman MJ. Ferrule design and fracture resistance of endodontically treated teeth. J Prosthet Dent 1990;63:529–36.
  3. Libman WJNicholls JI (1995Load fatigue of teeth restored with cast posts and cores and complete crownsInternational Journal of Prosthodontics 815561.

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