Objectives: The study aimed to investigate fracture resistance and fracture mode in restorations of teeth with flared root canal. The effects of reinforcement the flared canal and post systems (non-precious cast post and two prefabricated posts) were evaluated. Material and methods: Maxillary central incisors with simulated flared root canal were restored in 4 different methods (n=10, each), compared with control group : normal root canal restored with cast post and core (group 1). 4 methods restoring the flared root canal were; morphologic cast post and core (group 2); composite resin reinforced + cast post and core (group 3); composite resin reinforced + stainless steel post + composite resin core (group 4) and composite resin reinforced + carbon fiber post + composite resin core (group 5). All posts were cemented with resin cement. The load was applied at 130 degree on lingual surface of core to obtain the fracture resistance. One way ANOVA and Scheffe's statistical analysis were performed at significant level = 0.01. Results: Normal root canal in group 1 significantly showed the strongest group (1,126.9+75.5 N). Reinforcement the flared canal in group 3 had significantly higher fracture resistance than morphologic post in group 2 (639.9+48.3 N and 489.4+48.7 N) and resulted in shallower depth of root fracture. All cast post and core groups had significantly higher fracture resistance than two prefabricated posts. Stainless steel and carbon fiber post showed no significant difference of fracture force (301.1+50.4 N and 299.5+55.4 N) which occurred in composite resin core. Conclusions: Reinforcement with composite resin increased fracture resistance in restoring teeth with flared root canal, though not as good as remaining dentin. Restorations with cast post and core were stronger but resulted in root fracture, while restorations with prefabricated post were weaker but resulted in composite core fracture.

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