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

Autor(es)

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]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Aracatuba Dent Sch, Dept Restorat Dent, UNESP, Aracatuba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Operative Dentistry; v. 44, n. 5, p. 521-529, SEP-OCT 2019.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 16/19982-6 - Uso da luz violeta no clareamento dental: estudo da eficácia clareadora, fluorescência dentária, penetração trans-amelodentinária de H2O2, citotoxicidade, condutância hidráulica, geração de calor e adesão a materiais resinosos
• Beneficiário: Marjorie de Oliveira Gallinari
• Modalidade de apoio: Bolsas no Brasil - Doutorado