ANÁLISE COMPARATIVA DAS CARACTERÍSTICAS MECÂNICAS DE INSTRUMENTOS MANUAIS DE AÇO INOXIDÁVEL TIPO K: UM ESTUDO DE DIFERENTES MARCAS
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Resumo
O presente estudo teve como objetivo comparar as características geométricas e mecânicas de seis marcas diferentes de instrumentos manuais de aço inoxidável tipo K. Foram analisados instrumentos nos tamanhos 15 e 20, por meio de testes de resistência à flambagem e torção, seguindo as normas ISO 3630-1 e ANSI/ADA 101. A micromorfometria avaliou diâmetros e conicidades em pontos específicos (D0 e D3). Os resultados indicaram que os instrumentos TDK 15 e Angelus 0.20 apresentaram maior resistência à flambagem, enquanto variações no diâmetro em D0 foram observadas principalmente nos instrumentos TDK 15 e Perfect 15. Em relação à torção, os instrumentos Maillefer 0.20 destacaram-se pela maior deflexão angular antes da fratura, sugerindo maior flexibilidade. Assim, os instrumentos TDK 15 e Angelus 0.20 mostraram-se mais adequados para a negociação de canais atrésicos e retratamento endodôntico, porém as variações no diâmetro dos instrumentos TDK 15 e Perfect 15 podem comprometer a adaptação de cones na fase de obturação. Já os instrumentos Maillefer 0.20, com maior flexibilidade, são mais indicados para canais curvos.
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