Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
Vol. 12, No. 1, 2013, pp. 1-4
Bioline Code: os13001
Full paper language: English
Document type: Research Article
Document available free of charge
Brazilian Journal of Oral Sciences, Vol. 12, No. 1, 2013, pp. 1-4
© Copyright 2013 - Brazilian Journal of Oral Sciences
Fracture resistance of endodontically treated teeth restored with different intraradicular posts with different lengths|
Pereira, Jefferson Ricardo; Neto, Elias Manoel Ribeiro; Pamato, Saulo; do Valle, Accácio Lins; de Paula, Vitor Guarçoni & Vidotti, Hugo Alberto
Aim: This study compared the resistance to fracture of endodontically treated teeth restored with different intraradicular posts with different lengths and full coverage metallic crowns.
Methods: Sixty extracted human canine teeth were randomly divided into 6 groups. Groups CP5, CP75
and CP10 were restored using custom cast post and core (CP) and groups PF5, PF75 and PF10 were restored with provisional pre-fabricated tin post (PF) and composite resin core at 5 mm, 7.5 mm and 10 mm of intraradicular length, respectively. The specimens were submitted to dynamic cyclic loading and those that resisted to this load were submitted to load compression using a universal testing machine. Compressive load was applied at a 45-degree angle to the long axis of the tooth until failure.
Results: Kruskal-Wallis one-way analysis of variance by ranks showed statistically significant differences among the groups (p<0.0001). However, when the means were compared using the Tukey’s test, significant differences were noted between groups CP5 and CP10 and between groups CP10 and PF5. All groups presented root fractures and post displacements during mechanical cycling. All teeth in groups CP5 and PF5 failed the dynamic cycling test.
Conclusions: This study showed that increasing intraradicular post length also increases resistance to fracture of endodontically treated teeth. On the other hand, most endodontically treated teeth restored with pre-fabricated tin posts (provisional posts) failed in the dynamic cycling test.
post and core technique; prosthesis failure; mechanical stress
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