Resumo

OLIVEIRA, Iana Sá de; MARQUES, Vanessa Fontenele  e  CASSELLI, Denise Sá Maia. Assessing microhardness and roughness of composite resins of direct and indirect use. RFO UPF [online]. 2015, vol.20, n.1, pp. 28-38. ISSN 1413-4012.

Objective: to assess superficial roughness by mechanical contact profilometry and to assess the resistance to Knoop microhardness in resins light-activated by either conventional means or with systems of additional polymerization. Materials and methods: eighty-two (82) specimens were distributed in the following groups: SI: Solidex ™, Z1D: Z100™, Z35D: Z350™, OD: Opallis™, Z1I: Z100™, Z35I: Z350™, and OI: Opallis™. Resin increments were light cured for 40 seconds each. The group containing the resin of indirect use Solidex™ (SI) and groups Z1I, Z35I, and OI containing resins of direct use assessed as indirect, were light cured for 40 seconds plus 7 additional minutes with EDG-LUX. Samples were stored in distilled water at 37 °C for 24 hours. Then, the roughness test was performed and, subsequently, the test of superficial microhardness. The means collected were analyzed by the Kruskal-Wallis non-parametric test and Dunn's multiple comparison test. Results: resin Z100™, recommended for direct use, obtained the highest microhardness values, regardless of additional light curing. Nonetheless, resin Solidex, recommended for indirect use, obtained the lowest microhardness values. The roughness values did not present statistical differences among the materials analyzed. Conclusion: resins of direct use with additional polymerization may be satisfactorily used indirectly.

Palavras-chave : Composite Resins.; Microhardness.; Roughness.