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Antibacterial properties of copper iodide-doped glass ionomer-based materials and effect of copper iodide nanoparticles on collagen degradation



This study investigated the antibacterial properties and micro-hardness of polyacrylic acid (PAA)-coated copper iodide (CuI) nanoparticles incorporated into glass ionomer-based materials, and the effect of PAA-CuI on collagen degradation.

Materials and methods

PAA-CuI nanoparticles were incorporated into glass ionomer (GI), Ionofil Molar AC, and resin-modified glass ionomer (RMGI), Vitrebond, at 0.263 wt%. The antibacterial properties against Streptococcus mutans (n = 6/group) and surface micro-hardness (n = 5/group) were evaluated. Twenty dentin beams were completely demineralized in 10 wt% phosphoric acid and equally divided in two groups (n = 10/group) for incubation in simulated body fluid (SBF) or SBF containing 1 mg/ml PAA-CuI. The amount of dry mass loss and hydroxyproline (HYP) released were quantified. Kruskal-Wallis, Student’s t test, two-way ANOVA, and Mann-Whitney were used to analyze the antibacterial, micro-hardness, dry mass, and HYP release data, respectively (p < 0.05).


Addition of PAA-CuI nanoparticles into the glass ionomer matrix yielded significant reduction (99.999 %) in the concentration of bacteria relative to the control groups. While micro-hardness values of PAA-CuI-doped GI were no different from its control, PAA-CuI-doped RMGI demonstrated significantly higher values than its control. A significant decrease in dry mass weight was shown only for the control beams (10.53 %, p = 0.04). Significantly less HYP was released from beams incubated in PAA-CuI relative to the control beams (p < 0.001).


PAA-CuI nanoparticles are an effective additive to glass ionomer-based materials as they greatly enhance their antibacterial properties and reduce collagen degradation without an adverse effect on their mechanical properties.

Clinical relevance

The use of copper-doped glass ionomer-based materials under composite restorations may contribute to an increased longevity of adhesive restorations, because of their enhanced antibacterial properties and reduced collagen degradation.

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The authors wish to thank Mrs. Michelle Barnes for her outstanding secretarial support. The authors gratefully acknowledge the financial support from SC COBRE for Oral Health Research P20RR017696 and the Medical University of South Carolina Center for Oral Health Research. The authors declare no other conflicts.

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Correspondence to Camila Sabatini.

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This study was funded by SC COBRE for Oral Health Research; award number: P20RR017696 to Dr. Walter G. Renne.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Renné, W.G., Lindner, A., Mennito, A.S. et al. Antibacterial properties of copper iodide-doped glass ionomer-based materials and effect of copper iodide nanoparticles on collagen degradation. Clin Oral Invest 21, 369–379 (2017).

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  • Antibacterial
  • Collagen degradation
  • Glass ionomer
  • Matrix metalloproteinases
  • Micro-hardness