A 13-year-old child has been suffering from pain in the left inferior molar induced by cold stimuli for several months. Objectively: on the masticatory surface of the 37 tooth there is a carious cavity with overhanging enamel edges filled with circumpulpar dentin. The cavity is filled with light softened dentin. Probing of the cavity floor is somewhat painful. Cold stimuli cause short-term pain. Make a provisional diagnosis: