Dynamic recording of irrigating fluid distribution in root canals using thermal image analysis

Area of Science:

• Endodontics
• Dental materials science
• Fluid dynamics in confined spaces

Background:

• Effective irrigation is crucial for root canal treatment success.
• Understanding fluid dynamics within root canals is essential for optimizing cleaning and disinfection.

Purpose of the Study:

• To investigate how irrigating needle size and insertion depth, along with master apical file diameter, affect fluid distribution during root canal irrigation.

Main Methods:

• Utilized stepback instrumentation on human teeth with varying master apical file sizes.
• Employed thermal imaging to analyze dynamic fluid distribution during irrigation with different needle gauges and depths.
• Recorded and analyzed irrigation success based on irrigant flow to the apical region.

Main Results:

• Successful apical irrigation was achieved with a size 27 gauge needle in a size 30 canal at 3mm depth.
• Deeper needle placement (6mm) required larger canals (size 50+) for effective irrigation.
• Needle gauge, canal diameter, and insertion depth critically influenced irrigant delivery to the apex.

Conclusions:

• Large diameter irrigating needles, increased needle-to-apex distance, and narrow root canals adversely impact root canal irrigation flow distribution.
• Optimal fluid delivery necessitates matching irrigating needle size and depth to canal preparation size.