Influence of the needle diameter in irrigating solution renovation

Objectives:, to evaluate the influence of the needle diameter in irrigating solution delivery inside simulated root canals. Methods:, A size 35, .06 taper simulated root canal filled with India ink received irrigation with 0.1ml/s distilled water through 2 different systems. Group 1 was irrigated with 31 gauge, Endo-Eze Irrigator blunt tip needles (Ultradent Inc., South Jordan, UT, USA), while in group 2 a stainless steel, 0.5 mm diameter cannula was used. The images were recorded on a digital camcorder and analyzed to determine the amount of time required to remove all India ink from the simulated canal. Ten repetitions for each group were performed. Results:, statistical analysis revealed a significant greater time for removing the dye when the mettalic cannula was used, compared to the 31 gauge needles (Kruskal-Wallis test, p<0.05). Conclusions:, 31 gauge needles are more effective than cannulas in renovating the irrigating solutions from simulated root canals.