A comparative evaluation of the resistance to vertical root fracture after removal of separated instruments using three instrument retrieval systems: An <i>in vitro</i> study.

Hence, the roots from which separated instruments were retrieved using the Ultrasonic U files (Group A) were the most resistant to vertical root fracture and were statistically highly significant when compared with those roots wherein the separated instruments were retrieved using the ET 25 Ultrasonic retreatment tips (Group B) [ Table 2 and Graph 2 ].

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