Indianapolis, Indiana (1994 AGD meeting)
Latest Update Saturday, January 17, 1998
I met one of our previous attendees at the AGD meeting the other day and he reminded me that although some things seem simple to those who use a device or technique every day, habits develop that prevent us from using it properly.
A good example of that is loading the Precision Endo Syringe.
So for reference here is the technique with a few tips that may be valuable for some of you.
DO NOT USE A PAPER OR PLASTIC PAD.
When you mix on paper of plastic, you always end up with paper fibers or plastic scraped up into the mix.
This can very easily plug up a 30 gauge needle.
A piece of dust, rust, set cement or any kind of debris can plug a syringe.
Heat causes ZOE to set rapidly.
Water is a catalyst for ZOE.
You need enough that you can avoid trapping air in the cement when loading.
And do not ask your assistant to mix with a cement spatula.
It's too small.
Get a Buffalo #2 plaster spatula.
The front has small threads, the back threads are large The syringe is loaded from the BACK end.
The end of the barrel is repeatedly plunged downward into the mass of the cement on the slab.
Do not attempt to nibble away at the edges of the cement mass.
This usually ends up trapping too much air.
Generally after you have loaded about half of it full, you can see the cement from the front end.
In fact loading a syringe completely full is not a good idea.
The more cement you have, the more air you have.
What prevents good control of cement flow is air in the syringe.
Half a barrel is usually more than enough for several canals.
This keeps it from rolling all over the place.
Push down on the ball with the barrel onto the slab, force fitting the ball.
It is far easier to clean fresh cement off the outside threads of the barrel than to dig SET cement out of the plunger guide knob.
Wipe excess off the front with your finger tip.
If you fail to do this there will be air trapped between the outside threads of the syringe and the inside threads of the needle.
This acts as a shock absorber and prevents smooth flow and control of the syringe.
These washers last a long time but when they go they will get a small crack that often can be felt by running a finger nail around the washer.
THE PLUNGER GUIDE KNOB SHOULD NOT BE ATTACHED YET.
Too much pressure will crush it and cause it to leak.
Turning it backwards should stop the flow.
By turning it forward and back you can get it to a point where the slightest clockwise turn will restart the flow and slightly counter-clockwise will stop it.
If cement continues to flow, you probably have air trapped in the mix.
The only solution is to start over with a new needle.
It is really a new standard of care in endo.
E-mail your comments to drjack@BetterEndo.com