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. 2023 Jul 24:20:25.
doi: 10.18502/fid.v20i25.13343. eCollection 2023.

Comparative Effects of Three Bleaching Techniques on Tooth Discoloration Caused by Tea

Narges Panahandeh  1 , Shervin Mohammadkhani  2 , Shervin Sedighi  2 , Sogol Nejadkarimi  3 , Amir Ghasemi  1
Affiliations

Comparative Effects of Three Bleaching Techniques on Tooth Discoloration Caused by Tea

Narges Panahandeh et al. Front Dent. .

Abstract

Objectives: This study aimed to investigate the impact of three different bleaching protocols on tooth discoloration caused by tea. Materials and Methods: Forty extracted sound premolars were cleaned, disinfected, and their initial color parameters were measured (T1). The teeth were then immersed in boiled tea solution for 24 hours, and their color was measured again (T2). The samples were divided into four groups of 10 teeth each. Group A was treated with an in-office bleaching gel followed by 30 seconds of light curing. Groups B, C, and D were respectively treated with 0.24M oxalic acid followed by bleaching gel, 5.25% sodium hypochlorite followed by bleaching gel, and a combination of 0.24M oxalic acid, 5.25% sodium hypochlorite, and bleaching gel. The color was measured once more after the interventions (T3). Data were analyzed using two-way repeated measures ANOVA, paired sample t-test, and Tukey's test. Results: The mean color change (∆E2) between T2 and T3 was significantly higher in group D compared to group A (P<0.05). However, there was no significant difference in color change between groups A, B, and C. Additionally, there was no significant difference in color change between groups B, C, and D. The groups also showed significant differences in ∆L (P=0.007), with the only significant difference found between groups B and C (P=0.001). Conclusion: The combined use of sodium hypochlorite and oxalic acid followed by in-office bleaching gel is more effective than bleaching alone in correcting tooth discoloration caused by tea. This protocol can further reduce yellow coloration.

Keywords: Hydrogen Peroxide; Oxalic Acid; Sodium Hypochlorite; Tea; Tooth Bleaching.

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Conflict of interest statement

None declared.

References

    1. Mokhlis GR, Matis BA, Cochran MA, Eckert GJ. A clinical evaluation of carbamide peroxide and hydrogen peroxide whitening agents during daytime use. J Am Dent Assoc. 2000 Sep;131(9):1269–77. - PubMed
    1. Peterson J, Dwyer J, Bhagwat S, Haytowitz D, Holden J, Eldridge AL, Beecher G, Aladesanmi J. Major flavonoids in dry tea. J Food Compost Anal. 2005 Sep 1;18(6):487–501.
    1. Del Rio D, Stewart AJ, Mullen W, Burns J, Lean ME, Brighenti F, et al. HPLC-MSn analysis of phenolic compounds and purine alkaloids in green and black tea. J Agric Food Chem. 2004 May 19;52(10):2807–15. - PubMed
    1. Plotino G, Buono L, Grande NM, Pameijer CH, Somma F. Nonvital tooth bleaching: a review of the literature and clinical procedures. J Endod. 2008 Apr;34(4):394–407. - PubMed
    1. Reinhardt G, inventor. Clariant Finance BVI Ltd, assignee. Bleach Catalyst Mixtures Consisting Of Manganese Salts And Oxalic Acid Or The Salts Thereof. United States patent application US 13/060,828. 2011 Jun 23;

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