Assessment of Apical Extrusion using Rotary and Reciprocating Systems during Root Canal Retreatment.

Aim: The objective of this study was to assess apical extrusion after filling material removal using two systems, one rotary and one reciprocating.

Materials And Methods: A total of 34 extracted mandibular premolars with single roots were selected and, posteriorly, prepared and filled. Following material aging for 60 days, teeth were divided into two groups, according to the method used to remove root filling material: group I, ProTaper® Universal Retreatment instruments plus refining with the Hero 642® sequence and group II, WaveOne® instruments.