To evaluate the amount of debris and irrigant extruded apically following the use of the ProFile.04/.06 with Orifice Shapers and HERO 642 rotary instrumentation systems, and manual preparation using the modified step-down technique, in combination with irrigation by an anesthetic needle, perforated needle or passive ultrasonic irrigation (PUI).
One hundred-eighty teeth with single canals and similar morphologies were divided into nine groups. In each group, instrumentation and irrigation were performed using different methods. The extruded material was collected in pre-weighed vials, and the amount of extruded debris was calculated. The data were analyzed using a Kruskal-Wallis one-way analysis of variance and Dunn’s test.
The amount of debris extruded apically was significantly higher with the step-down technique (p<.001) and ProFile system (p<0.05) than with the HERO 642 system. While the amount of irrigant extruded apically by perforated needle was higher than that by PUI (p<.01), compared to both methods, the anesthetic needle caused greater irrigant extrusion apically (p<.001). While a negative correlation was determined between the extruded irrigant and working length (p<.01), the irrigant was positively correlated with both minor (p<.01) and major foramen areas (p<.05) (n=180).
HERO 642 and PUI yielded better results in terms of the parameters tested.