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Clinical Application

Laser activated bleaching of diode 810nm laser and NdYag laser

Keywords: Laser activated bleaching, diode 810nm laser, NdYag laser

The use of laser energy is a relatively novel approach for teeth whitening and presents some advantages over most available over-the-counter, home, and in-office bleaching products. The procedure can be completed with a single inoffice treatment and allows one to focus on a single tooth or even a selected part of a tooth. The choice of the wavelength is based on the light–target tissue relationship. The bleaching gel, on the one hand, should absorb the light, and the tooth structure, on the other hand, should be minimally affected. Therefore, photo-initiators or dyes are incorporated, which are adjusted to absorb the wavelength of the light source used [1]. This photo-thermal bleaching effect is used by diode (810 nm or 980 nm) and neodymium: yttrium–aluminum–garnet (Nd:YAG) (1,064 nm) lasers. The carbon dioxide (CO2) laser (10,600 nm) radiation is readily absorbed within approximately 0.1 mm of water-based solutions independently of any absorber. This rapid absorption heats the bleaching agent more quickly than does a conventional heat source, so that the pulp is purportedly not affected [2]. High-intensity green laser light has, additionally, a photochemical effect, which relies upon specific absorption of a narrow spectral range of green light (510–540 nm) into chelate compounds formed between apatite, porphyrin, and tetracycline compounds [3]. The argon ion laser (514.5 nm) and the frequency doubled Nd:YAG laser (2ωNd:YAG laser at 532 nm) can be used for photochemical bleaching, since their wavelengths approximate the absorption maxima of
these chelated compounds (525–530 nm) [4]. These greenlight emitting lasers can achieve a positive result in cases that are completely unresponsive to conventional photo-thermal power bleaching.

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