Erbium Gingival Retraction for Crown

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June 4, 2003 at 3:43 am #3327 Reply

Swpmn
Spectator

There has been much discussion of late on LaserDentistryForum regarding the effects of various wavelengths on soft tissues.

Here is an example where an Er:YAG laser was used today to retract the gingiva off the mesial margin of crown preparation tooth #18. 2940nm, 50mJ @ 30Hz without water, 300 usec PD, 600 micron quartz tip angled 80 degrees.

In this particular instance hemorrhage was controlled without the addition of lidocaine with 1:50k epinehrine(although the patient was anesthetized).

June 4, 2003 at 4:26 am #10240 Reply

ASI
Spectator

Hi Allen,

Good details and capture of prep margin.

How do you figure out the pulse duration at 300usec?

Andrew

June 4, 2003 at 6:14 am #10241 Reply

Glenn van As
Spectator

Hi Andrew………it says on the Danger sign I think for one thing.

Hi Allen…….nice detail, did you use Hydrogen peroxide. THe crown prep is nice………what camera did you use.

BLeeding was minimal , but did the patient have nice healthy tissue to begin with??

Thanks for posting.

Glenn

June 4, 2003 at 11:47 pm #10243 Reply

Swpmn
Spectator

Andrew:

As Glenn says, the PD is listed in the DELight’s accompanying materials as 300 usec. However, I think in a personal conversation I had with Tom Haney at ConBio the PD is around 240 usec(if anyone who knows can help us out here go ahead).

Glenn:

Excellent point, yes the tissue was healthy, that’s why I said “in this particular instance”. If the tissue was inflamed the Erbium might have performed poorly. However, I was IMPRESSED(get it?) that I was able to get this smooth of a margin with an Erbium laser. Believe it has to do with increasing the PPS to 30 Hz which gave me a nice smooth trough.

The camera is my same old Nikon Coolpix 880, I just took the pic at high resolution and cropped down to the prep so that it would appear well on this forum(roughly 600 pixels wide).

Al

P. S. No I did not use H202.

June 5, 2003 at 1:51 am #10242 Reply

Robert Gregg
Participant

Hi Al,

Nice going!

Yeah, as far as pulse duration for the DELight goes, Tom Haney told me it will vary in the software matrix as you change the Hz. So it is not user controlable, but will vary from 210 to 240 as you increase your repetition rate from 15 to 20 to 30.

Tom?……..oh Tom???

Bob

June 5, 2003 at 3:01 am #10244 Reply

Swpmn
Spectator

Thanks Bob. You and I had this conversation previously on PD and I thought it was around 240 usec. I’ve looked through the manuals for a PD spreadsheet at different settings like you mentioned in a post to Glenn. Haven’t found so far, hopefully Tom can help.

Al
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