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. 2022 May;26(5):4099-4108.
doi: 10.1007/s00784-022-04379-z. Epub 2022 Feb 23.

Strategy for reducing cytotoxicity and obtaining esthetic efficacy with 15 min of in-office dental bleaching

Uxua Ortecho-Zuta  1 , Carla Caroline de Oliveira Duque  1 , Rafael Antonio de Oliveira Ribeiro  1 , Maria Luísa Leite  1 , Diana Gabriela Soares  2 , Josimeri Hebling  3 , André Luiz Fraga Briso  4 , Carlos Alberto de Souza Costa  5
Affiliations

Strategy for reducing cytotoxicity and obtaining esthetic efficacy with 15 min of in-office dental bleaching

Uxua Ortecho-Zuta et al. Clin Oral Investig. 2022 May.

Abstract

Objectives: Evaluate in vitro the esthetic efficacy and cytotoxicity of a bleaching gel containing 35% hydrogen peroxide (BG-35%H2O2), applied for different time intervals, on enamel coated or not with polymeric biomaterials.

Materials and methods: Nanofiber scaffolds (NSc) and a primer catalyst (PrCa) were used to coat the bovine enamel/dentin discs before the application of BG-35%H2O2, according to the following groups: G1-negative control (NC, without treatment); G2, G3, and G4-BG-35%H2O2 applied for 3 × 15, 2 × 15, and 15 min; G5, G6, and G7-BG-35%H2O2 applied on enamel coated with NSc and PrCa for 3 × 15; 2 × 15, and 15 min, respectively. The culture medium with components of gel diffused through the discs was applied on MDPC-23 cells, which were evaluated regarding to viability (VB), integrity of the membrane (IM), and oxidative stress (OxS). The quantity of H2O2 diffused and esthetic efficacy (ΔE/ΔWI) of the dental tissues were also analyzed (ANOVA/Tukey; p < 0.05).

Results: Only G7 was similar to G1 regarding VB (p > 0.05). The lowest value of H2O2 diffusion occurred in G4 and G7, where the cells exhibited the lowest OxS than G2 (p < 0.05). Despite G5 showing the greatest ΔE regarding other groups (p < 0.05), the esthetic efficacy observed in G7 was similar to G2 (p > 0.05). ΔWI indicated a greater bleaching effect for groups G5, G6, and G7 (p < 0.05).

Conclusion: Coating the dental enamel with polymeric biomaterials reduced the time and the cytotoxicity of BG-35%H2O2.

Clinical significance: Coating the dental enamel with polymeric biomaterials allows safer and faster BG-35%H2O2 application.

Keywords: Cytotoxicity; Dental bleaching; Odontoblasts; Polymeric biomaterials.

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