Influence of air‐abrasion executed with polyacrylic acid‐Bioglass 45S5 on the bonding performance of a resin‐modified glass ionomer cement

Abstract

The aim of this study was to test the microtensile bond strength (μTBS), after 6 months of storage in PBS, of a resin-modified glass ionomer cement (RMGIC) bonded to dentine pretreated with Bioglass 45S5 (BAG) using various etching and air-abrasion techniques. The RMGIC (GC Fuji II LC) was applied onto differently treated dentine surfaces followed by light curing for 30 s. The specimens were cut into matchsticks with cross-sectional areas of 0.9 mm(2). The μTBS of the specimens was measured after 24 h or 6 months of storage in PBS and the results were statistically analysed using two-way anova and the Student-Newman-Keuls test (α = 0.05). Further RMCGIC-bonded dentine specimens were used for interfacial characterization, micropermeability, and nanoleakage analyses by confocal microscopy. The RMGIC-dentine interface layer showed no water absorption after 6 months of storage in PBS except for the interdiffusion layer of the silicon carbide (SiC)-abraded/polyacrylic acid (PAA)-etched bonded dentine. The RMGIC applied onto dentine air-abraded with BAG/H(2)O only or with BAG/PAA-fluid followed by etching procedures (10% PAA gel) showed no statistically significant reduction in μTBS after 6 months of storage in PBS. The abrasion procedures performed using BAG in combination with PAA might be a suitable strategy to enhance the bonding durability and the healing ability of RMGIC bonded to dentine.

Evaluation of the micro-mechanical strength of resin bonded–dentin interfaces submitted to short-term degradation strategies

“…Two specimens for each sub-group were prepared as previously described and prepared for confocal micropermeability evaluation (Sauro et al, 2012). Briefly, the evaluation of micropermeability of resin-dentin interfaces was performed using a 0.1 wt% lucifer yellow water solution (LY: Sigma Chemicals, St. Louis, MO, USA).…”

“…Reflected and fluorescence signals were detected with a photomultiplier tube to a depth of 20 mm and then converted to single-projection images for better visualization and qualitative analysis (Sauro et al, 2012).…”

Designing dental composites with bioactive and bactericidal properties

“…Indeed, new materials that can remineralize the dental hard tissues [14] will find multiple applications in the minimal invasive …”

Effect of Bioglass 45S5 air-abrasion on dentin bonding: evaluation of microtensile bond strength and confocal microscopy

“…The bioactive glasses are used in minimally invasive techniques for caries removal because hardness of these materials very similar to those of dental tissue [18]. Moreover, the bioactive glasses also have ability to stimulate the remineralization of demineralized tissue, promoting crystal growth similar to apatite presents in dental tissue [8].…”

“…Moreover, the alcohol (adhesive solvent) may also interfere on bond strength [25]. Although the Bioglass 45S5 air-abrasion has not improved the bond strength, the bioactivity of this material may induce hydroxyapatite formation within the bonding interface, protecting the demineralized dentin collagen against endogenous dentin proteases [18] improving the quality of the hybrid layer. It can be observed also in Fig.…”