Dentin permeability associated with cleansers and irrigation methods

Objectives: To evaluate the effects of cleansers and irrigation methods on the permeability index (PI) in primary root dentin, Methods: 112 extracted roots were selected and distributed according to the cleansers: Dakin (D), Dakin+Hydrogen Peroxide (DHP), 2% Chlorhexidine gel (C), and Saline (S). The canals were manually instrumented. Irrigation was performed manually (MI) or ultrasonically (UI). The roots were impermeabilized, filled with 2% methylene blue solution, and longitudinally sectioned. The halves were marked in thirds (cervical, middle, apical) and the areas of dye penetration were measured. PI data were submitted to factorial ANOVA and Tukey tests (p<0.05), Results: A significant effect of MI/UI, in association with cleansers, was seen on PI. For all thirds, the PI of MI was superior to UI. Cervical third: MI achieved a high PI when associated with D, DHP and S. UI associated with S and C produced the highest PI. Middle third: MI associated with D and DHP produced the highest PI. Apical third: MI associated with D demonstrated the highest PI. None of the UI and cleanser associations induced differences in PI for the middle and apical thirds, Conclusion: MI produced better results than the UI. The D, DHP and S cleansers demonstrated the highest PIs, suggesting that the association of MI and these cleansers is recommended for primary teeth for maintenance of dentin permeability.