A 7-year-old boy was brought to the dentist. Objectively his gums are hyperemic and bleeding, the teeth are mobile and covered in plaque, their roots are exposed, periodontal pockets are pathologic and filled with granulations. The child is registered for regular check-ups with the pediatrician. According to the mother, lately the child’s condition has been deteriorating. The boy presents with diabetes insipidus and exophthalmos. What provisional diagnosis can be made?