Resumo

DANTAS, Marta Cléa Costa et al. Effect of argon plasma therapy on teeth exposed to sodium hypochlorite: Analysis of hydrophilicity. RFO UPF [online]. 2015, vol.20, n.1, pp. 34-38. ISSN 1413-4012.

Objective: to assess the hydrophilicity of dentin surface previously immersed in 6% sodium hypochlorite (NaOCl) solution and treated with argon plasma by contact angle analysis. Materials and method: twenty flat surfaces of pulp chamber of bovine teeth were used. Four groups were assessed (n=5): Control (C) - dentin without treatment; (HA) dentin immersed in NaOCl for 30 minutes and then etched with phosphoric acid (PA) for 15 seconds; (HAA30) dentin immersed in NaOCl, etched with PA, and treated with argon plasma for 30 seconds; and (HAA300) dentin immersed in NaOCl, etched with PA, and treated with argon plasma for 300 seconds. Analysis of contact angle was obtained by a sessile drop profile using a goniometer. In each drop of water, 20 measurements were carried out per second. The values of contact angle were statistically evaluated using the Kruskal-Wallis and Mann-Whitney tests (p < 0.05). Results: treatment with argon plasma for 30 seconds led to a significant reduction in the contact angle values when compared to the other experimental groups. The 300s argon plasma group and NaOCl did not statistically differ, but showed favorable results compared to the control group. Conclusion: treatment with argon plasma for a short term period, 30 seconds, favored the hydrophilicity of dentin surface previously exposed to 6% NaOCl.

Palavras-chave : Adhesion.; Dentin.; Sodium hypochlorite.; Wettability..