Resumo
Objetivo: Comparar a microdureza Knoop de resinas nanoparticuladas convencionais e bulk fill. Métodos: Foram confeccionadas 10 amostras cilíndricas (6mm x 4mm) de cada resina. Para a resina Filtek Z350XT, a fotoativação com LED (1200 mW/cm2) ocorria a cada incremento de 2mm, e para a resina Filtek One Bulk Fill, em 4mm totais, por 20s. Ambas superfícies das amostras foram lixadas com lixas d’água 400>600>1200 e avaliadas quanto a microdureza Knoop. Em seguida, foram termocicladas até se obter 10.000 ciclos, variando-se de 5ºC a 55ºC. Após a termociclagem, a microdureza Knoop foi reavaliada. Os dados foram submetidos à ANOVA 2 critérios de medidas repetidas e teste Tukey (ⲁ = 0,05). Resultados: A resina bulk fill apresentou a menor microdureza em ambas as superfícies, antes e após termociclagem, quando comparada à resina convencional (p > 0,05). A termociclagem não induziu alteração da microdureza (p > 0,05). Conclusão: A resina bulk fill, apresentou microdureza inferior à resina nanoparticulada convencional, estando mais suscetível à fadiga, à fratura e ao desgaste.
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