ArticleBMC oral health2025
Evaluation of bioactive glass primer on dentin bonding durability and interface properties.
Article in BMC oral health, 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
objectiveThis study aimed to evaluate the effects of a novel phosphosilicate bioactive glass (BG)-containing primer on dentin bond strength, nanoinfiltration, and the biomechanical and ultrastructural properties of the dentin-primer interface.
methodsA primer was formulated with 7.5% (w/w) phosphosilicate BG particles (SiO₂·P₂O₅·Na₂O·CaO; particle size 0.2-10 μm) suspended in distilled water. Four groups were tested (n = 5): (1) control groups using an etch-and-rinse (ER) or self-etch (SE) adhesive strategy per manufacturer's instructions, and (2) experimental groups where the BG-primer was applied before the ER or SE adhesive (designated BG-ER and BG-SE, respectively). Specimens were subjected to micro-tensile bond strength (µTBS) testing immediately and after 12 months of aging in distilled water (37 °C). Nanoleakage was assessed by SEM (n = 3 per group). The chemical profile and ion-release potential of the BG-primer were analyzed using ATR-FTIR spectroscopy under dry conditions, immediately after hydration, and after six hours. Data were analyzed using two-way ANOVA and Tukey's test (α = 0.05).
resultsThe incorporation of the BG-primer did not significantly affect immediate µTBS compared to control strategies. However, after 12 months, both BG-ER and BG-SE exhibited significantly higher µTBS values than their respective controls. The BG-ER group maintained its bond strength over time, while the BG-SE showed a significant increase. Nanoleakage analysis revealed comparable silver nitrate in filtration among all groups. SEM identified BG particles localized near the hybrid layer and partial dentinal tubule occlusion in BG-treated specimens. ATR-FTIR confirmed sustained ionic release and time-dependent chemical shifts, evidenced by decreased crystallinity upon aqueous exposure and spectral shifts indicating persistent ionic reactivity.
conclusionIncorporation of a BG-containing primer improved the long-term stability of resin-dentin bonds without compromising immediate adhesion, supporting its potential to enhance the durability of adhesive interfaces.
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