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BACKGROUND Post-operative pain (PP) following pulpectomy is of concern for endodontic patients and dentists. AIM The current study evaluated the intensity of PP following pulpectomy in primary maxillary molars, using two irrigation needles. DESIGN One hundred patients in ages ranging from 6 to 9 years requiring pulpectomy for asymptomatic primary teeth with non-vital pulp were included in the study. The participants were randomly assigned to two groups of 50 patients each, according to the type of irrigation needle used, that is, a co