Introdução: A limpeza e modelagem, são etapas de extrema importância na instrumentação dos canais radiculares para que se tenha um tratamento endodôntico feito com excelência. Com o objetivo de otimizar o tempo de trabalho e apresentar um material de qualidade, foram criadas as limas de NiTi (Niquel Titânio) que asseguram um tratamento endodôntico com sucesso. Os blocos de acrílico são usados para que tenha uma padronização dos canais simulados. Objetivo: Esta pesquisa teve como objetivo comparar as limas Reciproc Blue e V-File, após o seu segundo uso. Métodos: foram utilizados 40 blocos de acrílico, divididos em quatro grupos (n=10) de acordo com o número de usos de cada instrumento: REC1, REC2, VF1 e VF2. Antes do preparo do canal radicular, a patência dos canais foi verificada com uma lima K #10. Imagens fotográficas do pré e pós-operatório foram obtidas para posterior sobreposição e análise em software de imagem (Adobe Photoshop CS5.1). A análise estatística foi feita utilizando teste T e o teste Mann Whitney. Resultados: mais resina foi removida do lado externo no começo da curva pelo instrumento Reciproc Blue em todos os pontos examinados (p < 0.05). Em relação a distância de transporte do canal, não houve diferenças significativas em nenhum dos pontos. O instrumento Reciproc Blue apresentou preparos mais largos e menos conservadores. Conclusão: Ambos os instrumentos (Reciproc Blue e V-File) são seguros para o preparo de canais curvos, oferecendo uma limpeza e modelagem eficaz. Contanto o instrumento V-File apresentou preparos mais conservadores.
Objective: The cleaning and shaping of root canals is undeniably a step of great importance for the success of endodontic treatment. With the aim of optimizing the time and quality of this step, numerous instruments of different materials and shapes have been developed over the years. One of these instruments was nickel-titanium files, which have greater flexibility and resistance, allowing a better prognosis for endodontic treatment. In this study, two endodontic files, Reciproc Blue and V-File, were compared with the aim of evaluating their performance after the third use. Materials and methods: 60 acrylic blocks wrapped with laminated paper and filled with Nankin ink were used. Instrumentation was performed with an endodontic engine, by an experienced operator. After instrumentation, the blocks were photographed so that the photographs were superimposed. Results: After statistical analysis, it was found that there was no significant difference in the performance of the two groups after the third use. Conclusion: There was no significant difference between the two studied groups, and both are safe for the preparation of curved canals, but it is necessary that the manufacturer's recommendation is followed, regarding the number of canals instrumented with the same file.
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