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J Conserv Dent. 2018 Nov-Dec;21(6):613-617. doi: 10.4103/JCD.JCD_204_16.

Does ferrule thickness influence resistance to fracture of endodontically treated teeth?

Author information

Department of Restorative Dentistry, School of Dentistry, University of Pernambuco(FOP/UPE), Camaragibe, PE, Brazil.



Teeth with severe crown destruction and endodontically treated may or may not present a circular strip of dental tissue located in the cervical region called ferrule.


The aims of this study were to evaluate ferrule thickness influence on endodontically treated teeth (ETT) resistance to fracture.

Materials and Methods:

A total of 30 bovine incisor teeth were selected, endodontically treated and randomly distributed, according to the ferrule thickness: G1- no ferrule, G2 - 1 mm, and G3 - 2 mm. All the teeth were restored with prefabricated posts and composite resin. Resistance to fracture was established as the compression strength at 45° tilt at the lingual surface of the crown.

Statistical Analysis Used:

Data were analyzed using ANOVA and Tukey's test.


Resistance to fracture of G1 and G2 were significantly higher than that of G3 (P < 0.001). The pattern of fracture, common to all groups, occurred at the composite resin on the coronary portions.


Ferrule thickness can influence the resistance to fracture of ETT.


Dental restoration failure; dentistry; fatigue fracture

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