The aim of this study is to evaluate the effect of different irrigation activation methods on postoperative pain using visual analog scale (VAS) using Xp-endo Finisher, EndoActivator and Passive ultrasonic irrigation activation techniques with traditional irrigation method.

In this study, Traditional Irrigation (GI), Xp-endo Finisher (XPF), Passive Ultrasonic Irrigation (PUI), EndoActivator (EA) techniques will be used for irrigation activation. Twenty-five maxillary or mandibular single root and canal-shaped nonvital teeth will used in each group. Root canals will be prepared with TF-Adaptive system. Four different activation techniques will be applied during final irrigation. The canal treatments will be completed in one stage and postoperative pain analysis will be taken with VAS (Visual Analog Scale) scale after 12-24-48 hours. Statistical analysis will be performed with Mann Whitney-U test.

Vaious irrigation activation techniques have been used endodontic practice. These techniques are used to improve the activity of solutions. The selected techniques in this study are accepted as efficient methods for activation. However, postoperative pan is an important issue for clinicians. Thus, Traditional Irrigation (GI), Xp-endo Finisher (XPF), Passive Ultrasonic Irrigation (PUI), EndoActivator (EA) techniques will be used for irrigation activation. All techniques remove hard and soft tissue remnants successfully. The clinician expect to eliminate the postoperative pain. Therefore, a possible increase in pain due to activation technique may limit the use of these methods. The pain scores will be measured using the scale and statistically analyzed.

Inclusion Criteria:

• nonvital tooth
• single rooted tooth

Exclusion Criteria:

• tooth not requiring root canal treatment
• patients under 18 years old
• vital tooth
• tooth having more than 1 canal