Class 3 Vs Class 4 Laser

It will be listed either in arabic numerals 1 2 3r 3b 4 or in roman numerals i ii iiia iiib iv.

Class 3 vs class 4 laser.

Laser classes lasers are classified for safety purposes based on their potential for causing injury to humans eyes and skin. Early fda approved therapy lasers were class 3b lasers maximum 0 5 watts. Class 3b lasers are also considered as biomodelators and class 4 as surgical lithic. 3b lasers are safer.

A high energy laser can administer low doses. If the class iv laser is in the 940 980nm wavelength range then it will penetrate less than a class 3b laser in the 800nm to 900 nm range. Class 1 class 1m class 2 class 2m class 3r class 3b class 4 class 1 class 2 class 3 class 4. 1 from 1 to 4 99 mw into a 7mm aperture e g pupil of the eye or 2 five times the class 2 limit of 2 5 mw cm2 which works out to be 12 5 mw cm2.

The second method is used by lasersafetyfacts to determine nohd. Class iv laser companies use class 3b evidence to promote their products because they don t have much of their own. One thing remains certain current scientific and clinical research proves that class 3b lasers are best suited for therapeutic applications and class 4 lasers are best suited for tissue destruction. Class 3b low power laser up to 500mw has the common name of cold laser and those of class 4 high energy hot laser.

The pressure will also lead the laser probe closer to the target. Others offer pulsing to allow for heat dissipation. The fda defines a class iiib laser as a device with a power output between 5 500mw 0 005 0 5w and a class iv laser as a device with a power output above 500mw 0 5w. The foundation of class iv laser therapy is based on the delivery of a therapeutic dose of joules to a large area of target tissue reducing variability in outcomes.

There is zero published evidence to show that a class 4 laser penetrates deeper than a high powered 3b laser. Most laser products are required by law to have a label listing the class. Thus a class 3b laser can penetrate deeper into tissue than a class iv laser and can therefore saturate the target faster. The therapeutic vector dose of laser is the energy joules administered.

Class 3r is either. More absorption plus therapeutic effect. 3b laser systems cost less. The effect of laser is achieved on the tissues that absorb the applied energy.

Dr lothar lilge on class 4 laser youtube. Maximum power output is separate from wavelength so you might find class iiib and class iv lasers with the same wavelength.