A 9-year-old child complains of pain in the left mandibular molar that occurs during eating. The masticatory surface of the 75 tooth exhibits a carious cavitiy filled with softened dentin and localized within parapulpar dentin. The cavity communicates with the tooth cavity. Probing at the site of communication causes acute pain and moderate bleeding. Percussion of the tooth causes no pain response. Radiography revaled no periodontal alterations in the 75 tooth. Select the method of treatment: