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Technique

Create straight-line access

Establish patency by negotiating canal 1mm through root end using Lexicon® .08 and .10 stainless steel hand files, lubricated with ProLube® root canal conditioner. The goal is to get a .15 stainless steel hand file to length before rotary shaping.

Shape canal – Crown Down

GT Instruments and Obturators Match
  • Always begin crown down with the GT 20 series, .10 taper file (20/.10) at 300 RPM.
  • When resistance is met, the file will no longer passively make apical progress and less debris will accumulate in the flutes as the file is removed for cleaning. At this point, move to 20/.08 file.
  • Again, when resistance is met on the 20/.08, move to the 20/.06 file.
  • Continue this sequence to working length. Do not force any file to length.
  • Once at length, if greater taper is desired, move back up to the next larger taper in the 20 series and work passively to length.
  • Do not take any file larger than .08 taper around curvatures.
  • Use apical gauging to verify apical diameter

Gauge Apex/adjust shape
  • This involves taking a series of Lexicon NiTi hand instruments (20, 30 and 40) into the canal to measure the terminal diameter of the canal. When the gauging file that binds at length has the same tip diameter as the largest GT file taken to length, the shape is finished.
  • Begin with the size 20 NiTi hand file and take it to length.
  • If it binds at length, drop in the size 30, which should come short of working length. If it does, apical gauging is complete, and your shaping is done.
  • If the size 20 hand file doesn’t bind at length, take the size 30 to length.
  • If the size 30 hand file binds at length and the size 40 comes short of length, then select a size 30 GT rotary file that has the same taper last taken to length when shaping with the 20 series. This file should go to length easily.
  • If the 30 hand file doesn’t bind at length and the 40 does, then take the size
  • 40 GT rotary file that has the same taper last taken to length when shaping with the 20 series. This file should go to length easily.
  • As a final step, confirm the apical diameter by repeating the gauging process by, once again, taking the 20, 30 and 40 hand files to length.
  • If additional coronal flaring is desired, use a GT 40/.10.

Disinfect Canal

Irrigate with BioPure™ MTAD™ Antibacterial Root Canal Cleanser according to product directions. Thoroughly dry the canal.

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