Inaccurate working length Everything follows negotiation to patency because electronic apex locators work predictably off patency (the file exiting the canal foramen 0.5mm into the periapical tissues). But many dentists first fail to negotiate the entire length of the root, then become lost inside the tooth and cannot obtain an accurate working length. The most efficient way to do this is to first negotiate to patency and then use the electronic apex locator. I love the ProMark and Root ZX II because they provide a very accurate working length. I recommend leaving the lip clip on through the appointment and confirming your working length during shaping. Shaping without an open glide path In my opinion, the three pillars of endodontic treatment are negotiation to patency, accurate working length and open glide path. Many dentists skip endodontic treatment steps and fail to obtain an open glide path, then wonder why the file separated or why they ledged the canal. It's imperative that you have a slip-and-slide glide path for the shaping file to advance down the root effectively and safely. Creating an open glide path is fairly easy because of advances in file metallurgy allow the newer glide path shaping files to effortlessly cut an open glide path. I like to first get a loose #10K file to working length, then run a ProGlider or WaveOne Gold Glider nickel titanium file down the canal to create a nice open glide path. FREE FACTS, circle 5 on card dentaltown.com \\ JUNE 2020 DT0620_Pullen_Endo_AG_V2.indd 37 37 5/20/20 1:03 PMhttp://www.pac-dent.com http://www.dentaltown.com