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both roughness and wear for all periods evaluated, followed by Protemp 4 and Structur 3, meanwhile Dencor groups presented the highest roughness and wear values for all periods. Key wordsAcrylic resin, bis-acryl, brushing, composite resin, polishing, roughness, wear. Regardless of the technique applied for chemomechanical preparation, postoperative pain is a very relevant matter in endodontics. Objective To evaluate postoperative pain after endodontic treatment of necrotic teeth submitted to large apical preparation (LAP) using oscillat