High-Concentration Hydrogen Peroxide Gels Containing Calcium Polyphosphate Associated With Violet Led Light:...

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Photochemistry

Background:

• In-office bleaching with hydrogen peroxide (HP) can compromise tooth enamel integrity.
• Additives like calcium polyphosphate (CaPP) and calcium gluconate (GU) are explored to mitigate these effects.
• Violet LED light (VL) is investigated as an adjunct to enhance bleaching efficacy.

Purpose of the Study:

• To assess the impact of CaPP and GU on the efficacy and enamel properties of HP bleaching gels.
• To evaluate the synergistic effect of VL irradiation with these supplemented bleaching agents.

Main Methods:

• Bovine enamel blocks were treated with HP gels (commercial, with GU, or with CaPP) and their VL-irradiated counterparts.
• Bleaching efficacy was measured via color change (ΔEab, ΔE00).
• Enamel microhardness (KHN), surface microhardness loss (%SHL), and roughness (ΔRa) were assessed pre- and post-treatment and after 14 days. SEM evaluated surface morphology.

Main Results:

• VL irradiation alone showed minimal color change.
• CaPP significantly increased ΔE00 in VL-irradiated groups.
• Only CaPP- and GU-containing gels restored initial microhardness by day 14.
• CaPP groups exhibited reduced surface microhardness loss compared to controls.

Conclusions:

• Bleaching gels formulated with CaPP effectively maintained bleaching outcomes and promoted enamel microhardness recovery.
• VL irradiation enhanced the bleaching performance of CaPP-containing gels.
• CaPP is a promising additive for dental bleaching formulations, aiding remineralization and improving efficacy with VL.