ArticleBrazilian oral research2025
Tropical almond antioxidant gels mitigate the adverse effects of strong whitening agents on immediate bonding.
Article in Brazilian oral research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Radicals from tooth whitening products can reduce bond strength, posing challenges for dentists when a bonding procedure must be performed in teeth immediately after whitening. This study aimed to evaluate the antioxidant activity (AA) of Terminalia catappa Linn (TCL) leaf extract as a potential agent to mitigate the negative impact of high-concentration whitening agents on immediate bonding performance. The AA of green and ripe leaf extracts was measured using the 2,2-di-phenyl-1-picrylhydrazyl radical scavenging capacity assay (DPPH). To determine the TCL influence on bond strength, six groups of bovine enamel blocks (n=10) were created. Group 1 was the positive control (unbleached enamel), while Group 2 was the negative control (no antioxidant treatment). Groups 3 to 6 were bleached and treated with 10% sodium ascorbate (SA) or 0.1%, 0.2%, and 0.3% TCL gels. Adhesion was conducted using a two-step conventional system and dental composite resin. Microtensile testing was performed after 24 hours, and data were analyzed by one-way ANOVA with Tukey's post hoc test (p > 0.05). From the DPPH assay, results with IC50 < 50 µg/mL indicate high AA for all tested extracts. This method established a difference of around 12 times more AA for the TCL-hydroalcoholic extract of green leaf to the aqueous extract of ripe leaves. There were no significant differences in bond strength among groups treated with TCL-hydroalcoholic extract of green leaf gels (p > 0.05) and unbleached enamel. Tropical almond-derived antioxidant gels emerge as a promising strategy to enhance immediate bond strength on enamel after high-concentration in-office whitening treatments.
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