الفهرس 
Title
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Abstract
Objectives: The aim of this prospective randomized clinical trial was to compare the degree of post-operative pain and analgesic intake at 0, 4, 12, 24, 48, 72-h and 7 days after the use of two different irrigation needles.Subjects and Methods: Thirty eight participants diagnosed with symptomatic or asymptomatic irreversible pulpitis in mandibular posterior teeth received single-visit root canal treatment and were divided randomly into two groups according to the type of needle used during irrigation either NaviTip 29-gauge, 27 mm with End-Vented needle (EVN) or NaviTip 31-gauge, 27 mm with Double Side-port Irrigator Tip (SVN). Post-operative pain was measured using Numeric Rating Scale (NRS) pre-operatively, immediate post-operatively and at 4, 12, 24, 48, 72-h and 7 days. Placebo and analgesic intake was recorded at the different time intervals.Results:There was a statistically significance difference in post-operative pain between both groups at 12, 24, 48 and 72-h post-operatively. A significant increase in pain level was recorded after4-h compared to the immediate post-operative in the end-vented needle group, followed by a gradual decrease in pain levels until pain disappeared at 7 days with no difference in medication (placebo and/or analgesic) intake post-operatively between both groups