The aim of this study was to perform a clinical and microbiological evaluation of teeth with incomplete apexogenesis and traumatic necrosis that were treated with a revascularization technique, evaluating the microbial reduction after the use a double antibiotic paste. Furthermore, the investigation also aims to identify the presence of Enterococcus faecalis and Porphyromomas gingivalis within the root canal system.

This investigation is a longitudinal prospective interventional study of a series of cases. Patients who sought treatment at the Faculty of Dentistry from June 2011 to September 2015 were selected. They should have one permanent tooth with traumatic necrosis.

Inclusion Criteria:

• They should have one permanent tooth with traumatic necrosis, which in turns should show color alteration, fistulae, periapical lesion, and/or internal or external root resorption, pain, or absence of pulp response to sensitivity tests at a clinical examination to be considered necrotic. Male and female patients who had not undergone antibiotic therapy 3 months before the treatment were included and clinical and radiographic examinations confirmed pulp necrosis.

Exclusion Criteria:

• Patients who did use antibiotics
• Patients who did loss of temporary coronary sealing between treatment sessions
• Patients who give up the research