Crown Down Orifice Opening Usually with size 25 Fine-Cut™ File in STS Note: This is done immediately after access opening preparation. The idea is that the tip of the file is small enough to get started into the orifice and then it is used as an orifice opener. Then as the size of the canal opens usually by removing the buildup of reparative dentin, you progress down the canal until the file sticks. At that point you can either a) use a smaller file b) or stop there if you are within 3-4 mm of the apex or c) probe to the apex and start enlarging with a sequence of files.
	Shape of Prep After Circumferentially Filing the Orifice
	Insert 15...Take X-ray for Measurement See the section on xray measurement technique. In short insert file, take xray, measure amount of file in tooth from landmark, measure amount of canal from tip of file to apex, add 80% of that to file measurement and probe to that depth, repeat until within one mm of the apex.
	Probe to Apex
	Circumferentially File With Sizes 20,25,30, precurving if necessary
	Until Size 40 Fits Comfortably to 4 mm from Apex
	Dress Apex (PTP filing with Hand Fine-Cut ™)
	Mc Combs Modification Within 1mm of apex with size 30 Fine Cut Hand File(use 25 and then 30 if necessary) Try in the 30 Gauge Endo Needle Modify to 35 if necessary
	Make Parabola
	Optionally Dress Apex
	Finished Prep For Passive Filling
	Passive Filling Technique
	Needle within 1mm of apex Turn syringe about 1/16 turn Wait 2 Seconds to Create Puff And to fill the Neck
	4 Seconds Begin withdrawing at a steady 1 mm every 2 seconds
	6 Seconds
	8 Seconds
	Needle Now In Parabolic Safety Zone
	Once in the Parabola Extra Cement Flows Coronally
	Start Withdrawing Needle
	Canal Full. Overflow in Pulp Chamber

---

---