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4 hours after application of arsenic paste to the 36 tooth pulp, a 27-year-old patient complained of pain in the treated tooth. Objectively: on the distal surface of the 36 tooth the temporary filling is present. Percussion causes no pain response. Gingival papilla in the region of the 36, 37 teeth is hyperemic and edematous, its apex is necrotized. What is the optimal tactics of this patient management?