Er:YAG - Laser Dentistry Forum

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January 2, 2005 at 1:18 am #2863 Reply

dkimmel
Spectator

Just read an interesting article in Dec 2004 Biophotonics on Er:YAG lasers. Which is at the 2.94um wavelength.. It was just a technology update on the development of this laser in Poland. One thing that caught my eye was this laser was used at 10HZ at 30mj for enamel ablation. That is a pretty low energy level. They were showing some really smooth cuts in gelatin showing no melting . Thermal damage would be min with this laser. Pulse duration was at 91.2ns. This is a Q switched laser. They were using xenon flashlamps for pumping and were planning on going to semiconductor laser diode. Thought it was interesting also from the stand point of some of the problems they have to overcome .

January 3, 2005 at 3:21 am #6666 Reply

Nick Luizzi
Spectator

David:
Happy New Year! You did alot to help me along my Laser education last year Thank you. But with regard to the er:yag ablation at 10 Hz, there was a speaker at the LVI course for HOYA who recommended 10 Hz and 275 mj for enamel ablation. He did not use that info in his presentation but to a group of us newbies he said it was very effective. I have used the er:yag at such settings and the scope of course and it is very effective and requires little to no chem. anastetic. It’s weird because we naturally seek higher energy levels. Have a great year. Nick Luizzi

January 3, 2005 at 6:47 am #6665 Reply

Albodmd
Spectator

Man, that’s really low. I can’t imagine getting decent ablation with that low power. It would take forever. Do they have a special tip or something?

January 3, 2005 at 11:12 pm #6659 Reply

Anonymous
Guest

You guys might also want to check out an article in the ESOLA Winter 2004. It has an article about erYAG and the influence of pulse width on cutting efficiency. Study said under 100usec was optimum and would cut equivilent to bur. They even did some with 50 usec if I remember correctly (Fotona Fidelis ERYAG- available in US ?). Sorry my journal disappeared over the holidays or I’d post it.

What were the pulse widths of the new MD ?

January 3, 2005 at 11:53 pm #6660 Reply

Anonymous
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Found it-

From ESOLA Autumn 2004

“The analysis of the results show that the ablation efficiency increases by a factor of 5 when pulse durations are decreased from 100usec to 50 usec.”

January 4, 2005 at 2:15 am #6662 Reply

dkimmel
Spectator

Ron,
I think you got it. This new laser has a pulse duration of .096us. Pretty short and maybe why they are having some troubles.
The MD is 140us for hardtissue and 700us for softtissue. They tell you not to use 700us on hard tissue. Well, they should never tell you not to!!
At 700us not much happens to enamel, It does generate alot more heat. However, on the rootsurface it cut smooth–real smooth. Something to play with.

January 4, 2005 at 2:35 am #6661 Reply

Anonymous
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Quote:

Quote: from dkimmel on 9:15 pm on Jan. 3, 2005
Ron,
This new laser has a pulse duration of .096us. Pretty short and maybe why they are having some troubles.
quote]

This new laser as in the fontana? what problems?

January 4, 2005 at 2:52 am #6663 Reply

dkimmel
Spectator

I don’t think this a Fontana laser. It appears to still be in development. They are having problems with with absorbtion by water molecules destroy the coatings on the lense. They are also having trouble stablizing the repetition rates greater then 12hz. Also they need more effective flashlamps and this is why they are going to a diode laser to act as the flashlamp. They are also trying to get femtosecond pulse widths.

January 7, 2005 at 11:57 pm #6664 Reply

joegarciaar
Spectator

I have a Fotona from feb 2001 (Fidelis Er Yag) (not the new). My laser don´t have tips, work with a zafiro lens. This is an advantage and a problem why the lens receives water and different particles what destroy the lens. My Fotona have four different waves. Very Short Pulse (Hard tissue), Short (H), Long (Soft), Very Long Pulse (soft). It is most versatile. On VSP (not Super VSP, only the new Fidelis- Fotona has SVSP). Fotona are a very important laser factory in Slovenia. We visit (with my wife, also she is dentist) in 2003. ( http://www.fotona.si/ ). The last December in Santiago de Chile, I could see a Waterlase working on enamel at the first time. Don´t are much difference for me. Now my first step in enammel are the AA (kavo Rondoflex), for open., the next step: ErYag
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