Analysis of radicular dentin erosion after sodium hypochlorite irrigation at different concentrations by scanning electron microscopy
Autor(es): Renovato SR, Oliveira MM, Siqueira PC, Silva JA, Decurcio DA
Palabras clave: Irrigantes endodônticos; Endodontia; Microscopia Eletrônica de Varredura.
Objective: To evaluate the dentin erosion after sodium hypochlorite irrigation in different concentrations by scanning electron microscopy (SEM). Methods: It was used twelve single-rooted teeth divided into 4 groups (n = 3) according to the used solution: 1% NaOCl, 2.5% NaOCl, 5% NaOCl and distilled water (control). All root canals were prepared using BioRace system, irrigated with the solution of the corresponding group and 17% EDTA. Longitudinal grooves were made to cleave the roots. The specimens were evaluated in scanning electron microscopy. The dentin erosion level was recorded considering the following criteria: Score 1 – there was no erosion on dentin; score 2 – moderate erosion and score 3 – Severe erosion. Result: The dentin erosion was proportional to the concentration of sodium hypochlorite. Practically, there was no erosion (score 1) in the group prepared with distilled water, on the other hand, the group irrigated with 5% NaOCl had the highest percentage of severe erosion, score 3. The group irrigated with 1% NaOCl had the prevalence of score 1 in cervical third and score 2 in the middle third, however all the scores were observed in apical third. In group irrigated with 2,5% sodium hypochlorite there was, predominantly, moderate dentin erosion (score 2) in all thirds. Conclusion: Dentin ero- sion was directly proportional to the concentration of sodium hypochlorite.
