IADR Abstract Archives
ACTIVATION OF ACID SOLUTIONS IN DIFFERENT CONCENTRATIONS: SMEAR LAYER REMOVAL AND EROSION ON DENTIN WALL
Objectives: Evaluate with SEM degree of smear layer removal and erosion on the substrate, using 2 active irrigation techniques and 3 irrigating solutions (17% EDTA, 5% and 10% Citric acid)
Methods: 48 extracted humans lower premolars were used, divided into 8 groups, (n = 6). Instrumentation: Protaper Gold System. Irrigation: Control 1 and control 2 groups: 5 ml sterile distilled water. Groups 3 and 4: 5 ml 5.25% NaOCl and 5 ml 17% EDTAC. Groups 5 and 6: 5 ml 5.25% NaOCl and 5 ml 5% citric acid. Groups 7 and 8: 5 ml 5.25% NaOCl and 5 ml 10% citric acid. In Control Group 1, 3, 5 and 7, sonic irrigation was used. Passive ultrasonic irrigation was used in Control Group 2, 4, 6 and 8. Samples were observed with SEM. 144 microphotographs were made at 5000X.
Results: A significant difference of removal was found between irrigation techniques/irrigants (Kruskal-Wallis test: p <0.05). Group 3 presented highest degree of removal, but there were no significant differences between groups 3, 4, 6 and 7. Lowest removal degree was observed in group 8, although there were no significant differences between groups 4, 6, 7 and 8. No significant differences of removal between thirds of root canal were found (Kruskal-Wallis test: p = 0.24). A significant difference was found in erosion degree between irrigation techniques/irrigants (Kruskal-Wallis test: p <0.05). Lowest erosion degree was found in group 5, but there were no significant differences between groups 5, 6, 7 and 8. Highest erosion degree was seen in group 3, although there were no significant differences between groups 3, 4, 6 and 7. No significant differences of erosion were found between thirds of root canal (Kruskal-Wallis test: p = 0.73).
Conclusions: Sonic Irrigation with 5.25% NaOCl + 17% EDTA produced highest smear layer removal. Sonic Irrigation with 5.25% NaOCl + 5% Citric acid produced lowest erosion degree. Passive Ultrasonic Irrigation with 5.25% NaOCl 5.25% + 5% Citric acid and Sonic Irrigation with 5.25% NaOCl + 10% Citric acid could provide a good balance between degrees of smear layer removal and erosion on dentin wall. There were no significant differences of smear layer removal and erosion between the different thirds of the root canal.
Methods: 48 extracted humans lower premolars were used, divided into 8 groups, (n = 6). Instrumentation: Protaper Gold System. Irrigation: Control 1 and control 2 groups: 5 ml sterile distilled water. Groups 3 and 4: 5 ml 5.25% NaOCl and 5 ml 17% EDTAC. Groups 5 and 6: 5 ml 5.25% NaOCl and 5 ml 5% citric acid. Groups 7 and 8: 5 ml 5.25% NaOCl and 5 ml 10% citric acid. In Control Group 1, 3, 5 and 7, sonic irrigation was used. Passive ultrasonic irrigation was used in Control Group 2, 4, 6 and 8. Samples were observed with SEM. 144 microphotographs were made at 5000X.
Results: A significant difference of removal was found between irrigation techniques/irrigants (Kruskal-Wallis test: p <0.05). Group 3 presented highest degree of removal, but there were no significant differences between groups 3, 4, 6 and 7. Lowest removal degree was observed in group 8, although there were no significant differences between groups 4, 6, 7 and 8. No significant differences of removal between thirds of root canal were found (Kruskal-Wallis test: p = 0.24). A significant difference was found in erosion degree between irrigation techniques/irrigants (Kruskal-Wallis test: p <0.05). Lowest erosion degree was found in group 5, but there were no significant differences between groups 5, 6, 7 and 8. Highest erosion degree was seen in group 3, although there were no significant differences between groups 3, 4, 6 and 7. No significant differences of erosion were found between thirds of root canal (Kruskal-Wallis test: p = 0.73).
Conclusions: Sonic Irrigation with 5.25% NaOCl + 17% EDTA produced highest smear layer removal. Sonic Irrigation with 5.25% NaOCl + 5% Citric acid produced lowest erosion degree. Passive Ultrasonic Irrigation with 5.25% NaOCl 5.25% + 5% Citric acid and Sonic Irrigation with 5.25% NaOCl + 10% Citric acid could provide a good balance between degrees of smear layer removal and erosion on dentin wall. There were no significant differences of smear layer removal and erosion between the different thirds of the root canal.