A 27-year-old patient complains of the long-term pain in the 22 tooth caused by cold and hot food, as well as of spontaneous pain lasting for 30 minutes and occurring 3- 4 times per day, aggravating at night. Pain arose 3 days ago after preparation of the tooth for the acrylic crown. Objectively: the 22 tooth is intact, the thermal test causes acute long-lasting pain, percussion is painless. What is the optimal treatment tactics?