الفهرس 
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Abstract
This study evaluated the effectiveness of XP-endo Finisher file in cleaning the canal after biomechanical preparation and compared it with Passive Ultrasonic irrigation. It also compared multiple activation techniques
with a single form of activation. Furthermore, it analyzed the sequences
of using them in regarding to cleaning.
Methods: A total of sixty freshly extracted human mandibular premolars
were used in this study. All the teeth were prepared using I-race rotary system and then were randomly divided into five groups (n=12) according to the final activation of irrigation technique as follow:
group 1 :( n=12) (negative control) conventional irrigation by
irrigating syringe.
group 2 :(n=12) Activation by passive ultrasonic irrigation.
group 3 :(n=12)Activation by XP-endo Finisher.
group 4 : (n=12) Activation by XP-endo Finisher then passive ultrasonic irrigation.
group 5:(n=12)Activation by passive ultrasonic irrigation then
XP-endo Finisher.