A 20-year-old man complains of spontaneous pain in the 24 tooth, which arose suddenly and persists for about 15 minutes. Objectively: the distal surface of the 24 tooth exhibits a deep carious cavity with overhanging walls. The cavity is filled with light softened dentin and communicates with the tooth cavity. The cold stimulus causes acute, slowly abating pain. Percussion causes no pain response. Select the best method of treatment: