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INTRODUCTION The aim of this study was to evaluate the volume of irrigant extrusion by different final agitation techniques in experimental models of immature teeth. METHODS Fifteen single roots of mandibular premolars with a length of 14 mm and an open apex were used to form 6 groups according to the final agitation technique group 1, positive pressure and no agitation; group 2, ultrasonic agitation with Irrisonic (Helse Dental Technology, Santa Rosa de Viterbo, Brazil); group 3, ultrasonic agitation with Irrisonic Power (Helse Denta