A 27-year-old man has had spontaneous pain from the lower right first molar for 2 days, and cold causes pain that lingers for about 30 seconds. The tooth is not tender to percussion, and the radiograph shows deep occlusal caries, mature roots and normal apical tissues. He wants to keep the tooth vital if possible. Under rubber dam the carious exposure bleeds heavily; after removal of the whole coronal pulp to the canal orifices, bleeding stops within 3 minutes with a sodium hypochlorite-soaked pellet. What is the most appropriate next step?