Resumo

AMARA, Marina et al. Effect of activation mode on flexural strength in dual-polymerized resin cements. RGO, Rev. gaúch. odontol. (Online) [online]. 2013, vol.61, n.3, pp. 363-367. ISSN 1981-8637.

Objective To compare he influence of two activation modes on two similar dual-polymerized resin cements. Methods Bars (2 × 2 × 12 mm) of RelyX ARC (3M ESPE, MN, USA) (ARC) and Enforce (Dentsply, Rio de Janeiro, Brazil) (ENF) were prepared, and three types of polymerization method were tested: (1) L: LED photoactivation/40 s; (2) H: halogen Light activations/40 s, and (3) C: chemical activation only (Complete absent of light). The groups were ARC-L; ARC-H, ARC-C, Enf-L, Enf-H, and Enf-C (n = 8). After 24 h, the specimens were tested using the 3-point bending method on a universal testing machine. Results The ARC cement showed superior flexural strength results. The mode of activation revealed similar results on both cements tested, but lightactivated groups (with LED or Halogen light) showed higher flexural strength values than did the chemical-activation-only group. Conclusion (1) RelyX ARC cement showed superior flexural strength when compared with Enforce; and (2) light activation resulted in better flexural strength values when compared to chemical activation on dual-polymerized resin cements.

Palavras-chave : Material resistance.; Resin cements.; Self-curing of dental resins..