ORIGINAL ARTICLE

 

Effect of post length on endodontically treated teeth: fracture resistance

 

 

Jefferson Ricardo Pereira^I; Accácio Lins do Valle^II; Talita Magro Juvêncio^III; Thais Maria Freire Fernandes^III; Janaina Salomon Ghizoni^IV; Marcus Vinícius de Reis Só^V

^IDDS, MSc, PhD, Department of Prosthodontics, Dental School, University of South of Santa Catarina, Brazil
^IIDDS, MSc, PhD, Department of Prosthodontics, Bauru Dental School, University of São Paulo, Brazil
^IIIDDS, Department of Prosthodontics, Bauru Dental School, University of Sao Paulo, Brazil
^IVDDS, MSc, PhD, Department of Periodontology, Dental School, University of South of Santa Catarina, Brazil
^VDDS, MSc, PhD, Department of Endodontics, Dental School, Federal University of Rio Grande do Sul. Brazil

Correspondence to

 

 

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ABSTRACT

AIM: This study compared the fracture resistance of endodontically treated teeth restored with posts and cores systems with different post lengths.
METHODS: Sixty extracted intact canines were randomly divided in 6 groups of 10 teeth each, as follows: groups 1, 2 and 3 were restored with custom cast post-and-core, and groups 4, 5 and 6 were restored with prefabricated post and composite resin core, with different post lengths (5.0, 7.5 and 10 mm, respectively). A compressive load was applied at a 45-degree angle to the long axis until failure occurred.
RESULTS: Two-way analysis of variance (á=0.05) showed statistically significant difference between the groups (p<0.001). However, when the mean fracture forces for the groups were compared (group 1: 254.4 N; groups 2, 3, 4, 5, 6 331.7 N, 434.7 N, 405.4 N, 395.6 N and 393.8 N, respectively), no significant differences could be detected among the three groups restored with prefabricated post and group 3.
CONCLUSIONS: This study showed that an increased post length in teeth restored with prefabricated posts does not significantly increase the fracture resistance of endodontically treated teeth. On the other hand, endodontically treated teeth restored with custom cast-post and core showed significant increase on fracture resistance when the post length is increased.

Keywords: post and core technique, composite resin, fracture strength.

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Acknowledgements

This study was supported by FAPESP.

 

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Correspondence to:
Jefferson Ricardo Pereira
Rua Rio Grande do Sul, 1901 - apto 303
Mar Grosso Laguna SC
CEP: 88790-000 Brazil
Phone: +55 (48) 36471571
Fax: +55 (14) 36264088
E-mail: jeffripe@rocketmail.com

Received for publication: April 09, 2010
Accepted: July 26, 2010