USE OF SODIUM HYPOCHLORITE SOLUTION AT THE STAGE OF ETCHING WHEN USING TWO-COMPONENT ADHESIVE SYSTEM
The aim of this study was to substantiate the use of sodium hypochlorite solution at the etching stage when working under the standard adhesive protocol using two - component adhesive systems (5th generation). The study was conducted on 15 molars removed by orthodontic or surgical (dystopia) indications. The teeth of the 1st group were treated according to the standard adhesion protocol, the teeth of the 2nd group were treated using sodium hypochlorite at a concentration of 3.25%. By electron microscopy of the teeth of the 1st group on photomicrographs we observed a demineralized layer of collagen between dentin and the adhesive; microscopy of the teeth of the second group layer did not reveal the demineralized collagen. A technical dynamometer was used to determine the strength of the tooth-composite bond. It was found that in the 2nd group the rupture of the "tooth-composite" took place at a higher power value (350 N) than in the 1st group (200 N). It can be concluded that the use of a solution of sodium hypochlorite at the stage of the current etching of hard tissues of the tooth contributes to the removal of a layer of demineralized collagen from the surface of the dentin, which contributes to the increase in the strength of the connection between the tooth and the composite material.