Bacteriemia during endodontic treatment in relation to the technique of biomechanical preparation: randomized clinical trial

Abstract

OBJECTIVE: The aim of this randomized clinical trial was to evaluate the frequency of bacteriemia during endodontic treatment, with comparison between two techniques for biomechanical preparation of the root canal system. MATERIALS AND METHODS: The sample comprised 50 patients aged 16 to 52 years, of both genders, which were divided into 2 groups with 25 patients each. Group I underwent biomechanical preparation by the step-back technique, and Group II was treated by the rotary technique with nickel-titanium instruments (K3). Patients were submitted to antisepsis of the oral cavity with chlorhexidine digluconate and three samples of blood were collected for blood culture: preoperatively, immediately after the biomechanical preparation and 10 minutes later. The significance level adopted was 5.0%, and analysis was performed by descriptive and inferential statistics by means of the Fisher's exact test, Fisher-Freeman-Halton test and Student's t test. Data were analyzed on the Statexact and SPSS softwares. RESULTS: All blood cultures achieved before and immediately after preparation were negative. On the other hand, with regard to the blood cultures collected 10 minutes after preparation, one (4%) positive case was found for Group I. However, this difference was not statistically significant (p = 0.50). CONCLUSION: The frequency of bacteriemia was low and observed just for Group I.OBJETIVO: O objetivo deste ensaio clínico randomizado foi avaliar a freqüência de bacteriemia durante o tratamento endodôntico comparando duas técnicas de preparo biomecânico do sistema de canais radiculares. MATERIAIS E MÉTODOS: A amostra constou de 50 pacientes, com idade variando entre 16 e 52 anos e de ambos os sexos, sendo dividida em 2 grupos de 25 pacientes. No Grupo I, realizou-se o preparo biomecânico através da técnica escalonada com recuo progressivo programado, e, no Grupo II, por meio técnica rotatória, empregando instrumentos de níquel-titânio (K3). Os pacientes realizaram anti-sepsia da cavidade bucal com gluconato de clorexidina e foram realizadas três coletas de sangue para hemoculturas: no pré-operatório, imediatamente após o preparo biomecânico e 10 minutos depois. O nível de significância foi de 5,0%, e foram utilizadas técnicas de estatística descritiva e inferencial através dos testes exato de Fisher, Fisher-Freeman-Halton e "T" de Student. A análise dos dados foi realizada através do programa Statexact e SPSS. RESULTADOS: As hemoculturas tomadas antes e imediatamente após o preparo, foram todas negativas. Já nas hemoculturas, realizadas 10 minutos após o preparo, foi encontrado um caso (4%) positivo no Grupo I. Esta diferença, entretanto, não foi estatisticamente significante (p = 0,50). CONCLUSÃO: Concluiu-se que a freqüência de bacteriemia foi baixa e observada apenas no Grupo I.