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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A New Approach for Dental Bleaching Using Violet Light With or Without the Use of Whitening Gel: Study of Bleaching Effectiveness

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Gallinari, M. O. [1] ; Fagundes, T. C. [1] ; Silva, L. M. [1] ; de Almeida Souza, M. B. [1] ; Barboza, A. C. S. [1] ; Briso, A. L. F. [1]
Total Authors: 6
[1] Univ Estadual Paulista, Aracatuba Dent Sch, Dept Restorat Dent, UNESP, Aracatuba, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Operative Dentistry; v. 44, n. 5, p. 521-529, SEP-OCT 2019.
Web of Science Citations: 1

The objective of this study was to evaluate the effectiveness of violet light-emitting diodes (LEDs) in dental bleaching treatment when used in conjunction with bleaching gels containing different concentrations of hydrogen peroxide (HP). Here, 90 bovine teeth (n=15) were randomly assigned to the following groups: GI, placebo without light; GII, 35% HP without light; GIII, 17.5% HP without light; GIV, placebo with violet LED; GV, 35% HP with violet LED; and GVI, 17.5% HP with violet LEDs. Three bleaching sessions of 45 minutes were conducted; 21 cycles involving one minute of irradiation by violet LEDs with 30-second intervals were performed during each session of bleaching (GIV, GV, and GVI). Color changes (Delta E, Delta L, Delta a, and Delta b) were analyzed using a visible ultraviolet light spectrophotometer 7 days after each bleaching session. The mean Delta E, Delta L, Delta a, and Delta b values were compared between groups by analysis of variance and Tukey tests, with a significance level of 5%. The groups treated with 35% HP had higher Delta E and Delta L and lower Delta b values, regardless of whether violet light was used. The group that received only violet LED differed from the control group in terms of Delta E, and the group treated with 17.5% HP and violet LED presented higher Delta E values than the group treated with 17.5% HP only. Thus, violet light did not influence bleaching efficacy when using 35% HP, but when used in conjunction with 17.5% HP, it increased the bleaching efficacy. Moreover, use of the violet LED only also prompted a bleaching effect, although it was less marked. (AU)

FAPESP's process: 16/19982-6 - Use of violet light in tooth whitening: study of efficacy whitener, tooth fluorescence, trans-dentinoenamel penetration H2O2, cytotoxicity, hydraulic conductance, heat generation and adhesion to resin materials
Grantee:Marjorie de Oliveira Gallinari
Support Opportunities: Scholarships in Brazil - Doctorate