OBJECTIVES: This study evaluated the effect of @entity880 and @entity1543 on the microhardness of a @entity16971 -based composite compared to two @entity11379 -based composite resins. MATERIALS AND METHODS: Thirty disc-shaped specimens each were fabricated of Filtek @entity12328 , Filtek Z250 and Filtek Z350XT. After measuring of Vickers microhardness, they were randomly divided into 3 subgroups (n = 10) and immersed in @entity880 , @entity1543 or distilled water. Microhardness was measured after 48 hr and 7 day of immersion. Data were analyzed using repeated measures ANOVA (p < 0.05). The surfaces of two additional specimens were evaluated using a scanning electron microscope (SEM) before and after immersion. RESULTS: All groups showed a reduction in microhardness after 7 day of immersion (p < 0.001). At baseline and 7 day, the microhardness of Z250 was the greatest, followed by Z350 and @entity12328 (p < 0.001). At 48 hr, the microhardness values of Z250 and Z350 were greater than @entity12328 (p < 0.001 for both), but those of Z250 and Z350 were not significantly different (p = 0.095). Also, the effect of storage media on microhardness was not significant at baseline, but significant at 48 hr and after 7 day (p = 0.001 and p < 0.001, respectively). @entity880 had the greatest effect. CONCLUSIONS: The microhardness of composites decreased after 7 day of immersion. The microhardness of @entity12328 was lower than that of other composites. @entity880 caused a greater reduction in microhardness compared to other solutions.

Effect of organic acids in dental biofilm on microhardness of a XXXX -based composite.

@entity11379 :: ('CHEBI:25218', 'Chemical') :: ['methacrylate'] @entity12328 :: ('57650', 'Gene') :: ['P90'] @entity880 :: ('MESH:D019344', 'Chemical') :: ['lactic acid', 'Lactic acid'] @entity16971 :: ('MESH:D062047', 'Chemical') :: ['silorane'] @entity1543 :: ('MESH:D019342', 'Chemical') :: ['acetic acid']
@entity16971 :: (MESH:D062047,Chemical) :: ['silorane']
