A 12-year-old girl complains of spontaneous pain in tooth 16 with short periods of remission (10-20 minutes) that developed 4 days ago. The pain increases at night and irradiates to the upper right jaw. Examination revealed a deep carious cavity in 16, the dentin is soft, the probing is painful at all points of the cavity floor, vertical percussion is slightly tender, the pain increases in response to thermal stimuli. EPT is 25 microamperes. Make the diagnosis: