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The purpose of this study was to investigate the fracture resistance of roots by using intraorifice barriers with glass fiber–incorporated ProRoot MTA and Biodentine.The diametral tensile strength and compressive strength of ProRoot MTA and Biodentine were determined after incorporation of 5 wt% and 10 wt% alkali resistant (AR) glass fiber powder into both cements. On the basis of higher diametral tensile strength and compressive strength values, ProRoot MTA and Biodentine with 5 wt% AR glass fiber were selected for further testing as intraorifice barriers. The 14-mm-long root specimens obtained from extracted mandibular premolars (n = 60) were prepared with nickel-titanium rotary files and obturated with gutta-percha + AH Plus sealer. After removal of coronal 3 mm of root fillings, the roots were grouped with respect to the intraorifice barrier material (n = 12/group): (1) ProRoot MTA, (2) ProRoot MTA with 5 wt% AR glass fibers, (3) Biodentine, (4) Biodentine with 5 wt% AR glass fibers, and (5) control (no intraorifice barrier). The specimens were loaded vertically at 1 mm/min crosshead speed until vertical root fracture occurred. The data were evaluated statistically by using 2-way analysis of variance and Tukey tests.Both incorporation of glass fiber and the type of material significantly affected fracture resistance (both P = .002). Roots with glass fiber–reinforced Biodentine barriers showed the highest fracture strength (P = .000).Incorporation of 5 wt% AR glass fiber can significantly improve the reinforcement effect of ProRoot MTA and Biodentine when used as intraorifice barriers.ProRoot MTA exhibited tensile strength values inferior to Biodentine.AR glass fibers improve mechanical properties of Biodentine and ProRoot MTA.Fiber incorporation into calcium silicate–based cements improves the reinforcing effect.