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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.)

Effect of violet LED light on in-office bleaching protocols: a randomized controlled clinical trial

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Kury, Matheus [1] ; Wada, Erica Eiko [1] ; da Silva, Daylana Pacheco [1] ; Machado Tabchoury, Cinthia Pereira [2] ; Giannini, Marcelo [1] ; Cavalli, Vanessa [1]
Total Authors: 6
[1] Univ Estadual Campinas, Fac Odontol Piracicaba, Dept Odontol Restauradora, Piracicaba, SP - Brazil
[2] Univ Estadual Campinas, Fac Odontol Piracicaba, Dept Ciencias Fisiol, Piracicaba, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Applied Oral Science; v. 28, 2020.
Web of Science Citations: 0

Objective: This study evaluated the clinical effect of violet LED light on in-office bleaching used alone or combined with 37% carbamide peroxide (CP) or 35% hydrogen peroxide (HP). Methodology: A total of 100 patients were divided into five groups (n=20): LED, LED/CP, CP, LED/HP and HP. Colorimetric evaluation was performed using a spectrophotometer (Delta E, Delta L, Delta a, Delta b) and a visual shade guide (Delta SGU). Calcium (Ca)/phosphorous (P) ratio was quantified in the enamel microbiopsies. Measurements were performed at baseline (T-0), after bleaching (T-B) and in the 14-day follow-up (T-14). At each bleaching session, a visual scale determined the absolute risk (AR) and intensity of tooth sensitivity (TS). Data were evaluated by one-way (Delta E, Delta a, Delta L, Delta b), two-way repeated measures ANOVA (Ca/P ratio), and Tukey post-hoc tests. Delta SGU and TS were evaluated by Kruskal-Wallis and Mann-Whitney, and AR by Chi-Squared tests (alpha=5%). Results: LED produced the lowest Delta E (p<0.05), but LED/HP promoted greater Delta E, Delta SGU and Delta b (T-14) than HP (p<0.05). No differences were observed in Delta E and Delta SGU for LED/CP and HP groups (p>0.05). Delta L and Delta a were not influenced by LED activation. After bleaching, LED/CP exhibited greater Delta b than CP (p>0.05), but no differences were found between these groups at T-14 (p>0.05). LED treatment promoted the lowest risk of TS (16%), while HP promoted the highest (94.4%) (p<0.05). No statistical differences of risk of TS were found for CP (44%), LED/CP (61%) and LED/HP (88%) groups (p>0.05). No differences were found in enamel Ca/P ratio among treatments, regardless of evaluation times. Conclusions: Violet LED alone produced the lowest bleaching effect, but enhanced HP bleaching results. Patients treated with LED/CP reached the same efficacy of HP, with reduced risk and intensity of tooth sensitivity and none of the bleaching protocols adversely affected enamel mineral content. (AU)

FAPESP's process: 17/08625-0 - In vitro purple led and argon plasma analysis on the color alteration, mineral content, morphology and safety of dental bleaching
Grantee:Matheus Kury Rodrigues
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 17/23841-1 - In vitro/in vivo led Violeta and in vitro argon plasma analysis on color alteration, mineral content, morphology and safety of teeth bleaching
Grantee:Vanessa Cavalli Gobbo
Support Opportunities: Regular Research Grants