, por sua dedicação à Endodontia, por sua contribuição à minha formação acadêmica e por ter realizado tanto pela nossa profissão.À Profa. Dra. Andiara De Rossi, por sua contribuição e observações na qualificação.À Profa. Dra. Raquel Assed Bezerra Segato, por sua contribuição na minha formação.Ao Prof. Dr. Idomeo Boneti Filho, por sua contribuição na minha formação acadêmica e profissional.À Profa. Dra. Angela Cristina Cilense Zuanon, por sua dedicação e motivação na minha formação profissional e pessoal.Ao Prof. Dr. Kleber Cortez Bonifácio, por sua amizade e incentivo para a realização do doutorado. AbstractIntroduction: Epidemiological studies have demonstrated a high prevalence of periapical lesion in different countries, stating that it is a health problem that affects great part of the world population. Aim: The aim of this randomized clinical study was to conduct a comparative evaluation after endodontic treatment of permanent teeth with chronic periapical lesion completed in a single session or in two sessions with 14-day calcium hydroxide interappointment intracanal medication, using cone beam computed tomography (CBCT). Methodology: Twenty-six pairs of teeth from 13 patients treated at the Endodontics Clinic of Ceuma University (UniCeuma), São Luís, MA, Brazil, were selected and randomly assigned to two groups (n=13/group) by simple random sampling (draw). In Group I, the teeth were instrumented and filled in the same session, while in Group II, after instrumentation, an intracanal medication (Calen ® paste) was used for 14 days between
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