I must first apologize for the delay in responding to your queries. I had a crazy schedule after coming back from Bhopal and really needed to get our clinic to full functioning status after its renovation. Now we are breathing a bit... so here goes... Ê
1 - Principle of 30-25-20-15 is not working in narrow canals i.e. mesiolingual canals of lower molars. Ê
The principle is just that - a principle - to be applied in canals with no formula fixed for the file sizes.
If the mesiolinguals are narrower, just start with a narrower file!
What would happen is that there would not be enough thinner files to eventually go to the apex.
Therefore, you would have to perform Push-Pull probing (milking the mouse), to get through the remaining canal space after the thinnest file (the number 15) starts binding.
For example, you may find that the orifice of a mesiolingual canal only allows a file size 20 till aboutÊ7 mm of depth from the cusp tip! What one must do then is to go to that depth and circumferentially file forÊa bit of time.
Then pick up the 15 and see to what depth it goes passively.
Circumferentially file at this new depth (say it may be about 12 mm).
This will clean out the walls till that depth.
Now, the same number 15 can be used as a negotiation tool with the help of the Push-Pull probing technique to reach what you may estimate as the apex.
Take a radiograph at this stage with the file in place and proceed further as usual. Ê
2 - Water irrigation of the upper teeth is almost impossible,so will it not be feasible to introduce it in the handpiece itself? Ê
If water irrigation is introduced into the handpiece itself, it would become bulky and loose its advantage of the small head reaching anywhere in the mouth.
Water irrigation need not go into the canal.
Neither does it need to be done from near the tooth!
The tip of the three-way syringe may even be outside the mouth if the pressure of water is good!!
It just has to hit the mouth of the access cavity, that is all!
The capillary action will do the rest!! Ê
3 - Can we find out a Visibly Guided Withdrawl System of canal filling needle ?
A device which will show on screen when and to how much withdraw the canal filling needle gradually out of canal,so that the filling will be precise and perfect. Ê
As of now, there is nothing of that kind being researched.
It would require a pressure detection gauge or a sonometer of microsize attached to the needle.... so that a readout of either the back pressureÊgeneration, orÊthe density within the canal space can be obtained and displayed as a readout.
I am not sure about the contribution of such devices to cost and bulk.....
Neither do I know of the existence of such devices....ÊÊÊÊ
I do hope that this answers your queries..... Apologies once more for the delay in response. Have fun doing the Automated Endo as well as the rest of Dentistry, coz Dentistry is fun!! My regards to you and best of wishes too. Ê
Mona Ê
Dr. Mona Kakar Ê
Certified Member & Country Chairperson, India - European Society of Cosmetic Dentistry
Accredited Member & Directorial Board Member - Indian Academy of Aesthetic & Cosmetic Dentistry Ê
www.le-visage.com
www.sanjeevni.com
www.bitein.com Ê
Le Visage & Sanjeevni Dental Clinic,
A/8 My Mother Co-op. Hsg. Soc.,
Above Union Bank of India,
412, R. C. Marg, Chembur,
Mumbai 400074.
India Ê