In vitro effectiveness of different dental bleaching protocols using violet LED

Area of Science:

• Dental Science
• Biomaterials Science
• Aesthetic Dentistry

Background:

• Growing global demand for teeth whitening.
• Hydrogen peroxide (HP) is effective but can harm dental structures.
• Violet LED light emerges as a novel, less invasive bleaching technique.

Purpose of the Study:

• To evaluate and compare the efficacy of violet LED light alone versus combined with 35% HP gel for dental bleaching.
• To assess the impact of different application frequencies and durations of violet LED light and HP gel on tooth color.
• To analyze the surface morphology changes in dental enamel after various bleaching protocols.

Main Methods:

• Six groups of bovine teeth underwent distinct bleaching protocols involving 35% HP gel and/or violet LED light over four weeks.
• Color changes were measured using a spectrophotometer.
• Scanning Electron Microscopy (SEM) analyzed surface enamel morphology.

Main Results:

• All bleaching protocols resulted in significant color changes (p <0.05).
• The conventional 45-minute 35% HP application caused the most enamel demineralization.
• Violet LED protocols, especially with shorter HP contact or no HP, showed comparable color change to conventional methods with minimal surface alteration.

Conclusions:

• Violet LED light, particularly when used alone or with reduced HP exposure, provides effective tooth bleaching.
• These alternative protocols achieve results similar to prolonged 35% HP application but preserve enamel integrity.
• Violet LED light represents a safe and promising alternative for dental professionals and patients seeking effective teeth whitening.