AUTHOR=Lopes Ana Cristina Távora de Albuquerque , Brondino Nair Cristina Margarido , Bombonatti Juliana Fraga Soares , Mondelli Rafael Francisco Lia 

TITLE=Effectiveness of violet LED with or without a bleaching gel: a 12-month randomized clinical trial

JOURNAL=Frontiers in Dental Medicine

VOLUME=5

YEAR=2024

URL=https://www.frontiersin.org/journals/dental-medicine/articles/10.3389/fdmed.2024.1427301

DOI=10.3389/fdmed.2024.1427301

ISSN=2673-4915

ABSTRACT=<sec><title>Introduction</title><p>The present interventional, controlled, randomized, blind clinical study aimed to evaluate the effectiveness of an in-office bleaching procedure with violet LED associated or not with 37% carbamide peroxide, considering as response variables the degree of change and color stability over 12 months and dental sensitivity over a month.</p></sec><sec><title>Methods</title><p>Forty participants, according to the inclusion and exclusion criteria, were randomly divided into 2 groups (<italic>n</italic> = 20) according to the bleaching protocol conducted, in two sessions, with a 7-day interval: vLED—violet LED, without gel; vLED/CP—37% carbamide peroxide photocatalyzed with violet LED (control group). In the vLED group, in each session the bleaching was carried out by 2 consecutive irradiation cycles of 25’ each (10 × 2’ LED + 30” interval), with 5’ interval between cycles. In the vLED/CP group, the gel was applied 5 times in the bleaching session and photocatalyzed 3 times for 2’ with 30” intervals (7’30” per gel application), totaling 37’30” per session. Dental sensitivity was assessed using a visual analog scale (VAS) and the effectiveness of bleaching as a function of the degree of change and color stability (<italic>Δ</italic>E) with a spectrophotometer. The data were tabulated and submitted to statistical tests (<italic>p</italic> &lt; 0.05).</p></sec><sec><title>Results</title><p>The VAS analysis showed that some individuals from both groups had mild pain (1 ≤ VAS &lt; 4) during the time intervals evaluated, being more prevalent in the vLED/CP group. Regarding the degree of color change, the groups behaved differently over time (<italic>p</italic> &lt; 0.0001). The <italic>Δ</italic>E observed for the vLED/CP group was superior in comparison to the vLED group at all evaluated moments.</p></sec><sec><title>Conclusions</title><p>Over 12 months, the vLED/CP group was more effective in relation to the bleaching effect compared to the vLED group. Both groups showed low levels of sensitivity in the studied time intervals.
</p></sec><sec><title>Clinical Trial Registration</title><p>[<uri xlink:href="https://ensaiosclinicos.gov.br/rg/RBR-6rc23h" xmlns:xlink="http://www.w3.org/1999/xlink">https://ensaiosclinicos.gov.br/rg/RBR-6rc23h</uri>], identifier [U1111-1253-8850].</p></sec>