Irrigation flow rate of 4 mL/min ideal for clearance of dye beyond needle tip in vivo root canal model
The use of an irrigation flow rate of 4 mL/min was able to achieve maximum effectiveness during Positive-pressure Irrigation and clearance of dye beyond needle tip in vivo root canal model, according to a recent study published in the Journal of Endodontics.
This study aimed to measure the pressure generated during positive-pressure irrigation at the periapex of an in vitro tooth model using a novel method of measurement, investigating the effect of flow rate and needle design. Apical pressure was correlated with the extent of dye clearance from the end of a needle tip in a plastic root canal model with similar dimensions.
The mesiobuccal canal of a mandibular molar was instrumented to #35/06 and placed into a chamber coupled to a pressure transducer. Irrigation was performed using a digital peristaltic pump using flow rates from 1–15 mL/min with irrigation needles of different sizes and designs. A plastic root canal model instrumented to the same size filled with dye was used to measure the extent of dye clearance beyond the needle tip using the same irrigation conditions.
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