IADR Abstract Archives
In Vitro Evaluation of the Debridement Efficacy: A comparative Study Using Passive Ultrasonic Irrigation with Different Apical Diameters
Objectives: To evaluate the elimination of organic tissue after the instrumentation of narrow, infected and curved root canals with an apical enlargement of 25 and 35 with or without passive ultrasonic irrigation.
Methods: 54 messiobucal canals from mandibular first molars with curvatures between 10 and 25 degrees were used. The samples were dividedin three groups, Group 1: 24 root canals instrumented with Race system in 04 taper up to an apical diameter of 25; Group 2: 24 root canals instrumented with Race system in 04 taper up an apical diameter of 35; Group 3: 5 non instrumented root canals as a control group. Groups 1 and 2 was farther divided in two subgroups of 12 samples each: Groups 1A and 2A were activated with passive ultrasonic irrigation (PUI), and groups 1B and 2B with conventional irrigation using syringes. Teeth were demineralized and included in paraffin and then perpendiculary cutted at 2 and 4 mm from the apex in 6 micrometers thickness slices. The root transversal samples were analyzed with a light microscope and the root canal cleanness was evaluated using a 0 to 3 score scale.
Results: When PUI was used, there was a pronounced reduction of the organic remnant in the apical enlargements of 25 and 35 without significant differences (p= 0.5). The amount of organic remnant found into the root canals after instrumentation with an apical enlargement of 25 and 35 using conventional irrigation with syringes showed a significantly pronounced reduction only in apical enlargement 35 (p= 0.02)
Conclusions: The using of PUI reduced the organic material of narrow infected and curved root canals with apical enlargement of 25 or 35. When PUI is not used, a biomechanical instrumentation up to a diameter >35 in narrow infected root canals it is recomended.
Methods: 54 messiobucal canals from mandibular first molars with curvatures between 10 and 25 degrees were used. The samples were dividedin three groups, Group 1: 24 root canals instrumented with Race system in 04 taper up to an apical diameter of 25; Group 2: 24 root canals instrumented with Race system in 04 taper up an apical diameter of 35; Group 3: 5 non instrumented root canals as a control group. Groups 1 and 2 was farther divided in two subgroups of 12 samples each: Groups 1A and 2A were activated with passive ultrasonic irrigation (PUI), and groups 1B and 2B with conventional irrigation using syringes. Teeth were demineralized and included in paraffin and then perpendiculary cutted at 2 and 4 mm from the apex in 6 micrometers thickness slices. The root transversal samples were analyzed with a light microscope and the root canal cleanness was evaluated using a 0 to 3 score scale.
Results: When PUI was used, there was a pronounced reduction of the organic remnant in the apical enlargements of 25 and 35 without significant differences (p= 0.5). The amount of organic remnant found into the root canals after instrumentation with an apical enlargement of 25 and 35 using conventional irrigation with syringes showed a significantly pronounced reduction only in apical enlargement 35 (p= 0.02)
Conclusions: The using of PUI reduced the organic material of narrow infected and curved root canals with apical enlargement of 25 or 35. When PUI is not used, a biomechanical instrumentation up to a diameter >35 in narrow infected root canals it is recomended.