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Fracture of the thin mesial incisal angles was ac- companied by normal or slightly increased overjet as seen in (FP1, FP2 and FP3), where fracture involving the thick distal incisal angle or the mesio-distal incisal edge were accompanied with increased overjet as seen in FP4, FP5, FP6 and FP7.
The anatomy of the incisal edge of the central incisor reveals that the distal incisal angle is thicker and more rounded than the mesial incisal angle, which consequently makes it prone to fracture with relatively less impact forces than the distal angle.