LASER DENTISTRY/LOW LEVEL LASER THERAPY: Therapeutic lasers expand the scope of dentistry
This group of lasers includes:
- The helium-neon (HeNe) laser was the first commercially offered dental laser in the 1980s. A gas laser with a main wavelength of 632.8 nm, it had the disadvantage of low output (1-2 mW) and brittle fiber optics with high power loss. HeNe lasers are now available with power of up to 60 mW, much more durable fiber, and improved transmittance. Although comparatively low-powered, HeNe light has the advantage of a long length of coherence.
- The HeNe laser has largely been replaced by technically less sophisticated and consequently less expensive InGaAlP lasers, which work at wavelengths of 633 - 690 nm and offer power of several hundred milliwatts. Being diode-based, the length of coherence is much shorter and the fluence used in successful HeNe studies has to be at least doubled with the red diodes to obtain similar results.
- GaAlAs lasers now dominate the market, probably because inexpensive diodes at these wavelengths have been available for a long time. The most common wavelength, 808 nm, has the best optical penetration into tissue. GaAlAs lasers can provide output in the watt range, though typical outputs are 100 - 500 mW.
- The GaAs laser is a pulsed laser, emitting at 904 nm, that requires lower dosages than other wavelengths. This laser has relatively complicated electronics–which may be the reason not many manufacturers offer them. Typical output is 10 - 100 mW.
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lucien@gigaalaser.com
Lucien
Sales manager
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