An 8-year-old boy complains of a dull pain in his lower right tooth. The pain appears in response to thermal stimuli and slowly abates after the stimuli are removed. Objectively on the approximal surface of tooth 46 there is a deep carious cavity. During necrectomy with a dental excavator, communication between the carious and dental cavities is detected. Probing of the communication area results in sharp pain and bleeding. What method of pulpitis treatment is recommended in this case?