Impact of Bioactive Glass-Based Toothpaste on Color Properties and Surface Microhardness of Bleached Enamel

• Published in: European journal of general dentistry Vol. 10; no. 1; pp. 001 - 006
• Main Authors: Garcia, Raíssa Manoel, Vieira-Junior, Waldemir Francisco, Theobaldo, Jéssica Dias, Aguiar, Flávio Henrique Baggio, Leite Lima, Débora Alves Nunes
• Format: Journal Article
• Language: English
• Published: Thieme Medical and Scientific Publishers Pvt. Ltd. A-12, 2nd Floor, Sector 2, Noida-201301 UP, India Thieme Medical and Scientific Publishers 01.01.2021
• Subjects: Original Article; tooth bleaching; tooth bleaching agents; surface properties; hydrogen peroxide
• ISSN: 2278-9626; 2320-4753
• DOI: 10.1055/s-0041-1732773

Abstract Objective  The role of toothpaste used during aesthetic treatments is rarely investigated. The objective was to evaluate the effects of a bioactive glass-based toothpaste (BGT) used before or after the dental bleaching with 35% hydrogen peroxide (HP). Materials and Methods  Bovine enamel blocks (4 × 4 mm; n = 12) were submitted to tooth bleaching and different treatments/storage, before or after HP, based on: (1) no toothpaste and immersion in artificial saliva (AS) after HP for 24 hours, 7 days, or 14 days (control); (2) daily BGT use and AS storage for 7 or 14 days (after HP); and (3) daily BGT use and AS storage for 7 or 14 days (prior to HP). Surface and in-depth color were determined using the CIE L*a*b* system (ΔL*, Δa*, Δb*, and ΔE) on enamel surface and underlying dentin. The surface microhardness (SMH) was evaluated using a Knoop microhardness tester. Statistical Analysis  Data were submitted to analysis of variance (ANOVA) (color variables), repeated measures ANOVA (SMH), and Tukey’s test ( α = 0.05). Results  The color changes on the enamel or underlying dentin were not statistically different among the groups ( p > 0.05). Twenty-four hours after HP presented a decrease in SMH differing from baseline ( p < 0.01). This decrease did not occur in the groups previously exposed to BGT ( p > 0.05). BGT use after HP for 7 days differed from group with exclusive AS storage ( p < 0.05). Conclusion  In-office tooth bleaching can decrease the microhardness of enamel surface; however, the use of BGT promotes the protection or enables the mineral recovery of tooth without the influence the bleaching efficacy.