Influência do hipoclorito de sódio em diferentes concentrações na resistência à fratura de dentes com rizogênese incompleta simulada

Abstract

The aim of this study was to evaluate the influence of different concentrations of sodium hypochlorite on fracture resistance of simulated immature teeth. The sample consisted of 72 bovine incisors, sectioned coronally and apically and internally fragilized to simulate teeth with incomplete root formation. The specimens were divided into 4 groups, according to the passive decontamination protocol recommended for pulp revitalization: group H1,5 - Irrigation with 20 ml of 1.5% Sodium Hypochlorite; group H2.5 - Irrigation with 20 ml of 2.5% Sodium Hypochlorite; group H5,25 - Irrigation with 20 ml of 5.25% Sodium Hypochlorite, and control group - irrigation with saline solution. In all groups, the irrigation protocol was performed by 5 minutes. After the simulation of the periodontal ligament, the teeth were fractured in a universal mechanical test machine. ANOVA and Correlation Spearman test were used for statistical analysis. The results showed that the mean fracture resistance (Newton) was 901.84, 831.29 and 829.84 for the groups H1.5, H2.5 and H5.25, respectively. The control group mean was 915.71. No significant differences were found between groups (p = 0.476 / ANOVA). There was no relationship between increased sodium hypochlorite concentration and decreased fracture resistance (p = 0.282 / Spearman Correlation). It was concluded that the concentrations, in the time and volume used in this study, did not cause a statistical decrease in fracture resistance.