- 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.