Effect of daily use of fluoridated dentifrice and bleaching gels containing calcium, fluoride, or trimetaphosphate on enamel hardness: an in vitro study

Author(s)

Prette Junior, Ronaldo Antonio Tolentino ^[1] ; DaneIon, Marcelle ^{[1, 2]} ; Pessan, Juliano Pelim ^[1] ; Emerenciano, Nayara Goncalves ^[1] ; Cunha, Robson Frederico ^[1] ; Shinohara, Mirela Sanae ^[1] ; Botazzo Delbem, Alberto Carlos ^[1]

Affiliation

^[1] Sao Paulo State Univ UNESP, Sch Dent, Dept Prevent & Restorat Dent, Rua Jose Bonificio 1193, BR-16015050 Aracatuba, SP - Brazil

^[2] Univ Ribeido Preto UNAERP, Dept Dent, Ave Costabile Romano 2201, BR-14096900 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 25, n. 3 JUN 2020.
• Web of Science Citations: 0

Abstract

Objective This study evaluated the effects of calcium gluconate (CaGlu), sodium fluoride (NaF), sodium trimetaphosphate (TMP), and NaF/TMP added to a 35% hydrogen peroxide (HP) bleaching gel for the reduction in enamel demineralization in vitro, with and without the use of a fluoridated dentifrice. Design Enamel blocks (n = 100) were obtained from bovine incisors (n = 200) after flattening and subjected to initial surface hardness (SH) analysis. The blocks were divided according to the bleaching gel (35% HP; 35% HP + 0.05% NaF; 35% HP + 0.25% TMP; 35% HP + 0.05% NaF + 0.25% TMP; 35% HP + 2% CaGlu) and were treated with ether non-fluoridated or fluoridated (1100 ppm) dentifrice. The bleaching gels were applied thrice (40 min/session) at the intervals of 7 days between each application. After 21 days, the final SH for the calculation of the percentage of SH loss (%SH) and cross-sectional hardness for the evaluation of the integrated hardness area (IH) were determined. Results Bleaching containing HP + NaF + TMP presented lowest %SH (p < 0.001), regardless of the dentifrice used. HP + NaF + TMP bleaching gel led to lower subsurface enamel mineral loss (IH) compared to the other groups (p < 0.001), and these did not differ from each other (p > 0.05). Daily use of fluoride dentifrice led to higher IH values (p < 0.001), regardless of the bleaching gels. Conclusion The addition of NaF/TMP to a 35% HP bleaching gel remarkably reduced the mineral loss compared to the cases of the other bleaching gels, regardless of dentifrice. (AU)

• FAPESP's process: 16/26132-9 - Effect of the addition of trimetaphosphate and fluoride in a bleaching gel based on hydrogen peroxide at 35% on the hardness of the enamel submitted to the daily use of fluoridated dentifrice
• Grantee: Ronaldo Antônio Tolentino Prette Júnior
• Support Opportunities: Scholarships in Brazil - Scientific Initiation