Fracture Strength of Endodontically Treated Teeth with Flared Root Canals and Restored with Different Post Systems

doi:10.1111/j.1708-8240.2006.00060.x

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Wiley InterScience

Journal of Esthetic and Restorative Dentistry

Volume 19 Issue 1, Pages 30 - 36

Published Online: 23 Jan 2007

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Fracture Strength of Endodontically Treated Teeth with Flared Root Canals and Restored with Different Post Systems

paulo césar maccari , dds, ms, phd* dúcia caldas cosme , dds ^† hugo mitsuo oshima , dds, ms, phd ^‡ luiz henrique burnett jr., dds, ms, phd ^§ rosemary sadami shinkai , dds, ms, phd ^¶

*Assistant professor, Department of Prosthodontics and Department of Restorative Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
^† Graduate student, Department of Prosthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
^‡ Associate professor, Department of Dental Materials, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
^§ Associate professor, Department of Restorative Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
^¶ Associate professor, Department of Prosthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil

Correspondence to Dr Rosemary S Shinkai, Av. Ipiranga 6681, Prédio 6, Faculdade de Odontologia—PUCRS, 90619-900—Porto Alegre, RS, Brazil. Tel./Fax: +55 51 3320-3626; e-mail: rshinkai@pucrs.br

ABSTRACT

Background: Many post systems are available to clinicians, yet no consensus exists about which one is better in restoring endodontically treated teeth.

Purpose: This study evaluated the fracture strength of teeth with flared canals and restored with two fiber-reinforced resin systems (glass fiber: FRC Postec [Ivoclar Vivadent, Schaan, Liechtenstein]; quartz fiber: D.T. Light-Post [Bisco Dental Products, Schaumburg, IL, USA]), and one custom cast base metal (Ni-Cr) post and core system.

Methods: Thirty anterior teeth had their crowns removed below the cemento-enamel junction and were endodontically treated. The canals were prepared for post fixation, and the canal walls were flared using a taper diamond bur. The prepared roots were randomly divided into three groups according to the post system. All posts were cemented with an adhesive resin cement. For the fiber-reinforced resin posts, cores were built up using microhybrid composite. Metallic crowns were luted using zinc phosphate cement. Specimens were loaded at 45 degrees in a universal testing machine at a crosshead speed of 0.5 mm/min until failure. The mode of failure was classified as repairable or nonrepairable.

Results: Teeth restored with cast posts had fracture strength twice that of teeth restored with resin posts. Fiber-reinforced resin posts failed at a compressive force comparable to clinical conditions, but all failures were repairable.

Conclusion: Fracture strength and mode of failure in anterior teeth with flared canals varied according to the type of post used to support a crown.