title: Diode laser-activated bleaching.
abstract: This study describes a preclinical investigation with laser-activated bleaching agent for discolored teeth. Bleaching techniques involve a broad-spectrum approach utilizing hydrogen peroxide (3-38%) with or without heat or laser, carbamide peroxide (10-30%), or a mixture of sodium perborate and hydrogen peroxide. Extracted human maxillary central incisors were selected. In the bleaching experiment, 38% hydrogen peroxide was used. Two different laser systems and light emission diodes for activation of the bleaching agent were used: diode laser, wavelength 970 nm, and infra-red diode laser, wavelength 790 nm, with eight blue light emission diodes, wavelength 467 nm. The enamel surface was evaluated with the scanning electron microscope. The method of chemical oxidation resulted in a 2-3 shade change in one treatment (15 min). Shorter time (5 min) was not effective. The diode laser, wavelength 970 nm, and the bleaching agent produced the same effect but with a shorter time of bleaching process (5 min - 1 W, 2.5 min - 2 W). Infra-red diode laser, wavelength 790 nm with eight blue light emission diodes, wavelength 467 nm, and the bleaching agent reached the desired color shade also after a shorter time (5 min - 40 mW). Slight surface modification after the bleaching process was detected with scanning electron microscopy. Currently, the laser has been proven the most valuable energy source for power bleaching with simple and short application in the dental office.
authors.affiliation: Charles University, 1st Medical Faculty, Department of Prosthodontics, GFH, Prague, Czech Republic. t.dostalova@quick.cz
authors.forename: Tatjana
authors.initials: T
authors.lastname: Dostalova
authors.forename: Helena
authors.initials: H
authors.lastname: Jelinkova
authors.forename: Devana
authors.initials: D
authors.lastname: Housova
authors.forename: Jan
authors.initials: J
authors.lastname: Sulc
authors.forename: Michal
authors.initials: M
authors.lastname: Nemec
authors.forename: Mitsunobu
authors.initials: M
authors.lastname: Miyagi
authors.forename: Aldo
authors.initials: A
authors.lastname: Brugnera Junior
authors.forename: Fatima
authors.initials: F
authors.lastname: Zanin
mesh_terms: D006861:Hydrogen Peroxide / Q000627:therapeutic use; D066298:In Vitro Techniques; D053685:Laser Therapy; D016877:Oxidants / Q000627:therapeutic use; D013997:Time Factors; D014073:Tooth Bleaching / Q000379:methods*
chemical_list: D016877:Oxidants; D006861:Hydrogen Peroxide