Influence of post-curing method on cure efficiency and roughness of direct resin composites in indirect restorations

Dayane Carvalho Ramos Salles de Oliveira, Jamille Favarão, Eduardo José Souza-Júnior, Adam Lee Dobson, Ronaldo Hirata, Regina Maria Puppin-Rontani, Mário Alexandre Coelho Sinhoreti

Objective: To evaluate the influence of different post-curing methods on cure efficiency and surface roughness of direct composite resins in indirect restorations compared to the conventional light-curing protocol. Material and Methods: Two direct composite resins, one nanofilled (Filtek Z350, 3M/ESPE) and one micro- hybrid (Amelogen, Ultradent), were used to obtain specimens (d = 4 mm, 2-mm thick) via different curing methods (n = 10). All specimens were light-cured at 48 J/cm2 (conventional-control), then subjected to a post-curing method: microwave post-curing or autoclave post-curing techniques. Both degrees of conversion and surface roughness were evaluated by means of Fourier transform infrared spectroscopy and a roughness meter, respectively. Data were submitted to two-way ANOVA and Tukey test (α = 0.05) for multiple comparisons. Results: Post-curing methods increased the degree of conversion for both composites (micro-hybrid: ~ 75% and nanofilled: ~ 60%) in comparison to the conventional light-curing method (micro-hybrid: ± 69% and nanofilled: ~ 56%). The curing method had no statistical effect on surface roughness, although the micro-hybrid composite presented higher roughness than the nanofilled composite (~ 0.16 and ~ 0.13, respectively). Conclusion: Within the limitations of this study, the following conclusion can be drawn: the microwave and autoclave techniques showed to be efficient post-curing methods for improving cure efficiency without compromising surface roughness, as compared to the conventional light-curing protocol.

Keywords: Light-curing. Permanent dental restoration.

How to cite: Oliveira DCRS, Favarão J, Souza-Júnior EJ, Dobson AL, Hirata R, Puppin-Rontani RM, Sinhoreti MAC. Influence of post-curing method on cure efficiency and roughness of direct resin composites in indirect restorations. J Clin Dent Res. 2016 Jul-Sep;13(3):84-9. DOI: http://dx.doi.org/10.14436/2447-911x.13.3.084-089.oar

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