Predictive factors of endodontic success in treatments performed by undergraduate/Fatores preditivos do sucesso endodontico em tratamentos realizados por alunos de graduacao/Factores predictivos del exito endodontico en tratamientos realizados por un estudiante

Introduction and objective: There are still few studies that accurately address endodontic success and which failures actually impact the endodontic treatment outcome. Determine success rate and predictive factors for successful endodontic treatment and retreatment by undergraduate students of the same learning level. Materials and methods: The preservation records (12 months) of the endodontic treatments performed in the Faculty of Dentistry of Pelotas were verified, indicating the success or failure of the treatment. Predictive variables in the outcome of successful endodontic treatment or retreatment were: tooth, number of channels, dental crown, symptoms, pulp diagnosis, radiographic periapical index. The treatment-related variables were: instrumentation technique, number of sessions and apical instrumentation limit. Results: 136 endodontic treatments were performed with a follow-up of at least 12 months. The evaluation showed that endodontic success was influenced by the number of sessions (P = 0.015), initial diagnosis and dental group (P = 0.014). It was also observed that the higher the initial radiographic periapical index, the worse the endodontic prognosis (P < 0.001). Conclusion: The success rate of endodontic treatment was 96.7% for cases of vital pulp, 87.5% for cases of pulp necrosis and 92.9% for retreatments. These indices were influenced by type tooth, initial diagnosis, initial radiographic periapical index and the number of visits used in the treatment. Keywords: Endodontics, success endodontic, root canal therapy, Pulpitis, Retreatment, Dental Pulp Necrosis. Introducao e objetivo: Ainda sao escassos os estudos que avaliam com exatidao o sucesso do tratamento e retratamento endodonticos e quais as falhas que realmente impactam no desfecho dos mesmos. Determinar o indice e os fatores preditivos para o sucesso de tratamentos e retratamentos endodonticos, realizados por alunos de graduacao com o mesmo nivel de aprendizado. Materiais e metodos: Foram verificados os registros de proservacao, com pelo menos 12 meses, dos tratamentos endodonticos realizados na Faculdade de Odontologia de Pelotas, analisando o sucesso ou o fracasso endodontico, de acordo com criterios clinicos e radiograficos. As variaveis preditivas no resultado do sucesso do tratamento foram: dente, numero de canais, coroa dentaria, sintomas, diagnostico da polpa e indice periapical radiografico. As variaveis relacionadas ao tratamento foram: tecnica de instrumentacao, numero