Background: Coronal fractures of permanent incisors represent 18-22% of all traumas to dental hard tissues. This investigation aimed to compare shear bond strength of fractured maxillary central teeth that incisal edge were restored by using different methods. Methods: fifty-two human maxillary permanent central incisors were selected and divided into 3 experimental and 1 control groups. All the specimens in the experimental groups were sectioned from the incisal edge using diamond disk. Incisal fragments in first experimental group were rebounded with Panavia-F cement, in the second group at first incisal fragments were rebounded with Panavia-F and then bevel was performed on the reattachment line and then teeth were repaired with single bond adhesive and Z250 resin composite, in the third group incisal edge of all teeth were restored with Z250 composite resin utilizing its bonding agent (single bond). In the fourth group, intact teeth served as control. The maximum loads needed to break adhesive bond of reattached fragment were measured and then shear bond strength of every specimen was calculated. Statistical analysis was conducted by using Kruskal-wallis and Mann-whitney tests. Results: The mean and Std.Deviation shear bond strengths were 2.21 MPa for group 1, 4.05 MPa for group 2, 3.69 MPa for group 3, and 29.62 MPa for group 4. There was a significant difference between the shear bond strength of different groups.. Conclusion: Reattachment of a fractured fragment with Panavia-F cement as well as bevel might be more preferable in cases of dental trauma.

Keywords: Composite, Panavia-F cement, Single bond

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