Influência do ácido hipocloroso obtido a partir de um dispositivo eletrolítico nas propriedades da dentina radicular: estudo in vitro

Abstract

This study aimed to evaluate, in vitro, the influence of hypochlorous acid obtained through an electrolytic device on the properties of root dentin. One hundred and fifty extracted bovine teeth were used to carry out 5 different evaluations: 30 for microhardness analysis, 15 for flexural strength analysis, 15 for cohesive strength analysis, 60 for fracture resistance analysis and 30 for penetration analysis dentin. The auxiliary chemical substances evaluated were divided into six groups: deionized water, 1% NaOCl, 2.5% NaOCl, 5.25% NaOCl, 250 ppm hypochlorous acid and 500 ppm hypochlorous acid. The results demonstrated that the groups treated with distilled water and hypochlorous acid had no significant difference in the microhardness of the root dentin (p>0.05). However, the groups treated with NaOCl demonstrated significant differences in dentin microhardness (p<0.05). In the mechanical tests, it was possible to observe that in terms of flexural strength and cohesive strength, the control group and hypochlorous acid did not obtain any statistical difference between them (p>0.05). However, the groups with NaOCl demonstrated a significant difference (p<0.05) when compared to the other substances. In the fracture resistance test, it can be observed that there was no statistical difference between any group tested (p>0.05). And, finally, in the dentin penetration test, the tested groups were statistically different from the control group (p<0.05), however, without statistically significant differences between them (p> 0.05). It can be concluded that hypochlorous acid had no influence on microhardness, as well as flexural, cohesive and fracture resistance, in addition to presenting satisfactory dentin penetration.