Characterization and effectiveness of a violet LED light for in-office whitening

Author(s)

Kury, Matheus ; Rueggeberg, Frederick A. ; Soto-Montero, Jorge R. ; Andre, Carolina B. ; Resende, Bruna A. ; Giannini, Marcelo ; Cavalli, Vanessa

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 26, n. 5, p. 12-pg., 2022-01-10.

Abstract

Objectives This study characterized a violet LED light (V-LED; bright max whitening) tooth whitening device and evaluated its efficacy on stained enamel compared to hydrogen peroxide (HP). Materials and methods Characterization of the V-LED beam profile was performed using a laser beam-profiler. The irradiance was measured throughout an exposure cycle at 0- and 8-mm distances using an integrating sphere and a spectral radiometer. Bovine enamel/dentin blocks stained with black tea (BT), cigarette smoke (CS), or without staining (CONT) were subjected to V-LED or 40% HP (n = 10/group). Color parameters (Delta L, Delta a, Delta b, and Delta E-00) were measured using a digital spectrophotometer. Light transmission was estimated through 1-mm-thick bovine enamel slices (n = 5). Delta L, Delta b, Delta E-00, and irradiance were analyzed by two-way ANOVAs and Tukey's tests, Delta a by Kruskal-Wallis and Mann-Whitney tests, and light transmission by t-test (alpha = 5%). Results Heterogeneous beam distribution was observed for the emitting V-LED chips. After 20 sequential exposures, irradiance levels were reduced 25-50%, regardless of the distance from V-LED. Localized irradiance values were statistically different between beam locations and different distances from the target. V-LED produced lower Delta E-00,E- Delta L, Delta a, and Delta b values than HP for CONT and BT, with no differences for CS. Light transmittance decreased approximately 98% through 1-mm thick enamel. Conclusions V-LED irradiance was heterogeneous and decreased throughout the exposure cycles and was also greatly reduced with increasing tip distance. V-LED produced a significantly lower whitening effect on BT and control teeth. Clinical relevance This study contributes to the knowledge of V-LED and its clinical use. (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