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Statement of problem: Severely damaged teeth frequently require placement of a core before preparation to receive an indirect restoration. However, the choice of the core material may also influence the outcome although reliable research data are scare. Purpose: The purpose of this study was to evaluate the effect of short fiber-reinforced composite resin of endodontically treated teeth restored with and without root canal posts. Methods: Sixty human extracted maxillary incisors were sectioned at the cemento-enamel junction. The root canals were prepared and obturated with gutta percha. Three groups of direct complete crowns were fabricated (n = 20 per group); Group A: made from particulate filler composite resin (Corestore 2, Kerr, control), Group B: particulate filler composite resin with fiber post (Aestheti-Post; Bisco), Group C: made from particulate filler composite resin with fiber post and short polyethylene fibers substructure (Ribbond Inc.). After finishing and polishing, the specimens were stored in 100% humidity at 37°C for 24 hours before they were statically loaded with a cross-head speed of 0.5 mm/min until fracture. Data were analyzed with 1-way ANOVA followed by Ryan-Einot-Gabriel-Welsch multiple-range test (α=.05). Results: ANOVA revealed that restorations made from particulate filler composite resin with fiber post and short polyethylene fibers substructure had higher fracture resistance capacity (309 N) (p< 0.05) than restorations made from particulate filler composite resin with fiber post (258 N). Control group had significant lower fracture resistance (178 N) (P<0.05).Conclusion: Polyethylene fiber may be an effective and practical method for reinforcement of the composite core material of endodontically treated teeth.

Reinforcement effect of polyethylene fiber to composite cores of endodontically treated teeth