A 9-year-old boy complains of a spontaneous pulsing and irradiating pain in his lower right teeth that slightly abates when cold is applied. Objectively, tooth 46 has a deep carious cavity with soft floor, located within the parapulpar dentin. Probing of the cavity floor is acutely painful. Percussion of the tooth is painful. The boy was diagnosed with acute purulent pulpitis of tooth 46. What treatment method should be chosen in this case?