Violet LED with low concentration carbamide peroxide for dental bleaching: A case report

Abstract

The use of violet LED was recently introduced as a new alternative technique to perform tooth bleaching, associated or not with bleaching agents. This paper shows a tooth bleaching clinical case report performed in a 26-year-old woman, using a violet LED with 10% carbamide peroxide (CP). The tooth bleaching protocol was performed in 3 sessions. Fifteen irradiations using a violet light system (BMW, MMoptics, São Carlos, SP, Brazil) were done during 30 s (on) and 60 s (off) without bleaching gel, and more 5 irradiations associated to 10% CP. Upper and lower arches were irradiated separately. The total procedure time was 30 min. Subjective and objective color assessments were performed using Vitapan Classical shade guide and VITA Easyshade spectrophotometer, respectively. Dentin sensitivity was measured using a visual analogue scale. The use of violet LED associated to a low concentration carbamide peroxide successfully promoted tooth bleaching and no side effects i.e. dentin sensitivity during and post treatment was observed.

Color change, diffusion of hydrogen peroxide, and enamel morphology after in‐office bleaching with violet light or nonthermal atmospheric plasma: An in vitro study

“…According to our results, the effect of violet light on extrinsic stains cannot be discarded. Rastelli et al speculated that VL alone could excite organic compounds adhered to the enamel surface and break it down into smaller compounds, which could explain the findings of our study. In view of this fact, the mechanism of action of VL alone may be restricted to extrinsic pigments on the enamel surface.…”

“…Besides, VL exhibited significantly higher ΔWI D than NTAP 14 days after bleaching. Thus, VL was more effective for removing red and yellow polyphenolic chromophores present in tea, reinforcing the theory that violet wavelength would interact with external discoloration . In addition, staining methods have been extensively used in several bleaching studies in order to standardize color parameters .…”

“…In view of this fact, the mechanism of action of VL alone may be restricted to extrinsic pigments on the enamel surface. Since protocols with VL alone are being constantly reported, further studies should investigate if enamel stained with other types of pigments would also benefit from VL irradiation, and clinical studies should demonstrate whether these results are translated into clinical conditions.…”

“…To overcome HP limitations, a novel generation of violet light‐emitting diode (VL) source for in‐office bleaching has been introduced in an attempt to replace the use of bleaching gels on patients with moderate to severe tooth sensitivity . As the wavelength of violet light (approximately 405 nm) differs from that of blue light (peak at 467 nm), which is commonly employed in in‐office bleaching, it was speculated that the light emitted from the new device could match the absorbance peak of the staining molecules adhered to the enamel surface . In addition, VL has also been combined with high‐concentrated CP or HP for patients with low or without intensity of tooth sensitivity aiming to increase peroxide effectiveness .…”

“…As the wavelength of violet light (approximately 405 nm) differs from that of blue light (peak at 467 nm), which is commonly employed in in‐office bleaching, it was speculated that the light emitted from the new device could match the absorbance peak of the staining molecules adhered to the enamel surface . In addition, VL has also been combined with high‐concentrated CP or HP for patients with low or without intensity of tooth sensitivity aiming to increase peroxide effectiveness . A recent in vitro study showed that VL promoted perceptible color change when applied alone, but to a lesser extent than HP gel, and also enhanced the effectiveness of a low‐concentrated HP gel .…”