A 30-year-old woman came to a dentist with complaints of an unpleasant bursting sensation in her upper right tooth. Heat makes this sensation worse. Objectively, the masticatory surface of tooth 17 has a deep carious cavity that communicates with the pulp chamber. Docp probing is painful. Percussion of tooth 17 is mildly painful. X-ray shows slight widening of the periodontal fissure at the root apices Electric pulp testing-70 microamperes. What diagnosis can be made in this case?