David–

No. They are not the same. Power must be measured at the fiber tip. The console display is meaningless. AND you must know your device’s pulse duration.

Waterlase PD = 140 usec
Delight PD = 240 usec

Get Jeff Manni’s book (see reference section) and a Molectron Power meter (molectron.com) to understand and to know, respectively what’s going on power wise.

Bob

Hi Glenn & Ron,

In direct pulp cap, as long as pulp is not bleedy, I have been using bleach to decontaminate, then acid etch except over exposed pulpal tissue, and dentin adhesive bonding agent, followed by fluoride flowable resin and closing over with composite or other restorative lmaterials. Advise patient of possible endo. Most of the time, the results are favorable.

Andrew

OT – laser kinetics for one hell of a ride

Laser Accelerated Plasma For Space Propulsion

Terry Kammash
Nuclear Engineering and Radiological Sciences
The University of Michigan
Ann Arbor, MI 48109

Recently conducted experiments at the University of Michigan and elsewhere have shown that ultra short pulse [ultra fast] lasers could accelerate charged particles to relativistic speeds. For example a picosecond laser pulse with only one joule of energy can accelerate an electron to MeV energy in just a few microns distance. This takes place through the high gradient potential that manifests itself in an electric field of a gigavolt per cm which in turn accelerates the electron to a megavolt energy over a distance of 10 microns. Current achievable laser peak power of about 10e15 Watts has been utilized in the study of relativistic non-linear optics in plasmas, and it is expected that laser power values will be reached in the near future that will accelerate protons to energies equal to their rest mass energy. That readily means that when such particles are ejected from a system at 0.866 the speed of light they will produce a specific impulse of 26 million seconds. Current experiments have also demonstrated that a beam of MeV protons containing more than 10e10 particles has been accelerated by an electric field of 10 GeV/cm corresponding to a laser power of about 100 TW. On the basis of these accomplishments it is reasonable to project with little risk that with modest modifications of present day systems including rep rates of 10-1000, accelerating 10e18 protons to 100 MeV energy will be quite achievable. If utilized as a propulsion device such a system will produce about 0.22 Kilonewtons of thrust at a specific impulse of about 13 million seconds. This will require a 15 KJ laser at a femtosecond pulse length which when incorporated in a propulsion system such a vehicle will have a dry mass of about 3.6 mT based on previous laser-fusion propulsion system design. When utilized in a constant thrust,acceleration/deceleration type of mission trajectory it is shown that a round trip to Mars will take about 53 days, and a fly-by mission to the Oort cloud at 10,000 AU about 7.5 years.

Glenn,
Have you been folowing this one?

http://www.dentaltown.com/idealbb/view.asp?mode=viewtopic&topicID=15275&num=50&sessionID={6F955206-28AA-46A6-BF85-FA55B8B7FD0E}&pageNo=1

Its what sparked my curiosity about what you may have placed .

You guys are too much! I am not brilliant, I just try things! You all have taken things to another level and have taught me so much as well!! Amazing. Remember Mike, keep the tip at about 10 mm from the surface of the tooth. I use 5.5 W 80-90%air, and 50-60%water for 90 seconds, and I mean 90 seconds, I time every one of them. Remember too, that the thinnest area of enamel to get penetration of the laser energy is in the occlusal groove, when doing an occlusal. MOVE THE LASER VERY SLOWLY on this area, to get the tooth BATHED in the laser energized water. SLOW is the main word. Let the laser work. Then remember too, you DON”T always have to ablate tissue in a focussed mode. You can get ablation as far away as 6mm with a G-4 tip, at 5.5W. I do most of my procedures with defocessed modes. Only when I am down to 1.5-2W do I go into focussed mode to remove stubborn decay, then I go to my microspoon excavators for final decay removal.

Funny thing, I had a new Biolase rep in today to watch me work, he was amazed, it was fun showing him some incredible things we can do with the laser. I did a real large class III on #23, deep near the pulp, and down the root surface, patient was EXTREMELY phobic, came to us because of the laser. He felt absolutely NOTHING. AND to top it off, the difficult filling came out great, and because of the microspoons, I feel pretty strong, that no endo will be needed. Very nice feeling I must say. I have never had better control of my dentistry than I have now with my laser, and the microspoons. Sorry no pictures today, it was a teaching day, no time. GLENN I WILL GET A SCOPE SOON! I envy you. By the way, I will be doing a lecture in Vancouver on May 23, pretty sure. I will let you know. We have to get in touch.
Thanks again, you make me turn red with the accolades!
Mark