fracture resistance of over flared endodontically treated central incisors restored with multiple prefabricated and custom-made glass fiber posts

Objectives: this study aimed to evaluate the fracture resistance of over flared endodontically treated bovine central incisors restored with prefabricated and custom-made glass fiber posts, using the multi-post approach. materials and methods: sixty-eight crownless over flared endodontically treated incisors were used for this study. the depth of prepared post space was 10 mm, and the remaining dentin thickness of the roots was 1 mm. the samples were randomly divided into four groups (n=17): group 1: two prefabricated glass fiber posts; group 2: prefabricated glass fiber post + braided glass fiber; group 3: braided glass fiber; group 4: no post. static load was applied at a crosshead speed of 0.5 mm/min at 135º angle relative to the root longitudinal axis until fracture. the data were analyzed using one-way anova and post hoc tukey’s test at a significance level of p<0.05. results: groups 3 and 4 exhibited the maximum (981 n) and minimum (461 n) fracture strength values, respectively. the differences between group 4 and other groups were significant (p<0.001), but the differences between groups 1, 2, and 3 were not significant (p>0.05). conclusion: multiple prefabricated and custom-made glass fiber posts significantly increased the fracture resistance of crownless endodontically treated central incisors with over flared root canals.