Eur Endod J. 2017; 2(1): 24 | DOI: 10.5152/eej.2017.17009

Fracture Strength of Flared Root Canals Restored with Different Post Systems

Vanessa Gehrcke¹, Milene De Oliviera², Fernando Aarestrup³, Maíra Prado⁴, Carolina Oliveira De Lima¹, Celso Neiva Campos^1
1Department of Dental Clinic Federal University of Juiz de Fora School of Dentistry, Juiz de Fora, MG, Brazil
²Department of Restorative Dentistry, Federal University of Juiz de Fora School of Dentistry, Juiz de Fora, Brazil
³Department of Immunopathology and Clinical Immunology, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil
⁴Department of Metallurgic and Materials Engineering, Federal University of Rio de Janerio, Rio de Janerio, RJ, Brazil

Objective: To evaluate the fracture resistance of different intra-radicular post systems in flared root canals.
Methods: Sixty human canines were used. The coronal portion was removed and the root length was standardized at 17 mm. Canals were prepared and filled with gutta-percha/AH Plus sealer. Roots were embedded in self-polymerising acrylic resin blocks. According to the material used, the teeth were randomly divided into three groups (n=20): glass fibre post (GFP): GFP and Z350 resin composite core; pre-fabricated metal post (PMP): PMP and Z350 resin composite core; and cast metal core (CMC): CMC with silver-tin alloy. Coronal reconstruction involved fabrication of metal copings. Samples were submitted to mechanical compression testing at 45º in a universal test machine. Fracture pattern was evaluated under a stereoscope. The fracture strength values were submitted to one-way analysis of variance (ANOVA) and Tukey tests (α=0.05).
Results: There was no statistically significant difference between the resistance values among groups (P=0.193). With regard to fracture pattern, GFP showed 55% and PMP 45% of Type I fractures, which considered repairable or favourable, whereas MCC presented 50% of Type V, which was considered irreparable or unfavourable.
Conclusion: Glass fibre and pre-fabricated metal posts have good fracture resistance to compression and may be used for restoring flared root canals, since they presented fractures mainly involving the filling core, thus facilitating later repair.

Keywords: Endodontic post, endodontically treated teeth, fracture resistance, restoration, tooth preparation

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