Patient 12 years old, occurs with pain and swelling, the patient was already under antibiotic therapy when he came to the office 3 days treated by a colleague who wanted to extract a tooth, the patient responds with a recommendation with the desire to save the tooth. Tooth 16, Pulpal Dg: Previously treated pulp, Ap Dg: Symptomatic apical periodontitis,
Th: Retreatment of upper right first molar 16.