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A 15-year-old girl complains of toothache that persists for a day and increases on biting. Objectively: in the 36 tooth there is a deep carious cavity non-communicating with the dental cavity. No reaction to the thermal stimuli is observed, probing of the carious cavity floor is painless. Vertical percussion is markedly painful. Gingival mucosa in the area of the 36 tooth is unaltered. X-ray presents with no alterations. Make the diagnosis: