Absorption is the second and the most beneficial tissue interaction. The treatment objective is accomplished with the photothermal effect. This is useful in photopolymerization of composite resins, but as the beam scatters, its power density eventually decreases to the point where it has no significant biologic effect. Laser energy, with one exception of wavelength, is delivered through an optical glass fiber. These fibers provide a highly flexible way of conducting the beam onto the target tissue.
Fibers are available in small diameters and are sterilizable.
The fibers are used in contact with the tissue. Laser Wavelengths and Characteristics Characteristics of commonly used dental laser wavelengths are described below. The first absorption peak of 488nm is the same as the quinoines that catalyze dental resin polymerization. The curing time using an argon laser is markedly reduced and the physical properties of the resin are enhanced. Excellent hemostasis is also achieved with the argon laser.