A 10-year-old child has fallen and hit stairs with his teeth. An appointment with a dentist was made only 2 days later. There are complains of cold stimulus causing sharp pain. Objectively: the 11th tooth has transversal defect at 2/3 of the crown, the pulp is significantly exposed. Probing causes sharp pain. Percussion is painful, the tooth is mobile. The gums are slightly hyperemic. What method of treatment should be used in this case?