Resumo

LOPEZ-LUJAN, Nieves A et al. Deproteinization of primary enamel with sodium hypochlorite before phosphoric acid etching. Acta odontol. latinoam. [online]. 2019, vol.32, n.1, pp.29-35. ISSN 1852-4834.

The aim of this study was to evaluate the deproteinization of primary enamel by analyzing etching pattern types, with and without the application of 5% NaOCl before acid etching with 37% H₃PO₄. Fifteen extracted human primary molars were randomly selected for the present in vitro study; 1mm x 1mm blocks were prepared and divided into two groups (n = 21). These groups were treated as follows: Group A- Acid Etching with 37% H₃PO₄ gel for 15 s; Group B- 5% NaOCl for 60 s + Acid Etching with 37% H₃POfor 15 s. The specimens were prepared for scanning electron microscopy analysis. The images were evaluated for quality types I and II etching of the enamel surface using ImageJ software. Datasets were checked for normality by Kolgomorv-Smirnov test and the nonparametric unpaired Mann-Whitney test was applied. The mean surface area of type I and II etching pattern values was 1922.314 µm²for Group A and 3840.473 µm²Group B. We conclude that deproteinization with 5% NaOCl prior to acid etching can be used to increase the area of adhesion and the quality of the etching pattern.

Palavras-chave : Dental enamel, tooth, deciduous, dental etching, sodium hypochlorite.

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