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Purpose <p>This study aimed to compare the effect of water-based ammonia-free silver fluoride (SF) and silver diammine fluoride (SDF) on the microshear bond strength (MSBS) of resin-modified glass ionomer (RMGIC) to artificially demineralised primary tooth dentine.</p> Methods <p>Twenty-four extracted primary molars were prepared to expose mid-coronal dentine; two bonding sites per tooth (total = 48 specimens) were chemically demineralised (pH 4.8) to simulate active caries. Specimens were randomised into three groups (<i>n</i> = 16): SF (Riva Star Aqua), SDF (Cariestop 30%), and Control (distilled water). RMGIC (Riva Light Cure HV) was bonded and stored for 24&#xa0;h at 37 °C. MSBS was measured using a universal testing machine, and failure modes were analysed using a stereomicroscope. Data were analysed using one-way ANOVA with Tamhane's T2 post hoc test (α = 0.05).</p> Results <p>The SF group exhibited significantly lower bond strength (3.65 ± 1.80 MPa) than the Control (6.86 ± 3.15 MPa, <i>p</i> &lt; 0.01) and SDF groups (6.65 ± 4.80 MPa, <i>p</i> &lt; 0.05). No significant difference was found between SDF and Control (<i>p</i> &gt; 0.05); however, the SDF group demonstrated greater variability, consistent with Weibull analysis. Adhesive failure predominated across all groups, with SDF showing more mixed failures.</p> Conclusion <p>Water-based SF significantly compromised RMGIC adhesion to demineralised primary tooth dentine. SDF maintained comparable mean bond strength to the control but with higher variability. Ammonia-free SF formulations may reduce immediate RMGIC retention when used before restoration, and this interaction may warrant protocol optimisation in SMART-based applications.</p>

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Effect of ammonia-free silver fluoride and silver diammine fluoride on immediate microshear bond strength of resin-modified glass ionomer to demineralised primary tooth dentine

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月19日

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  • A. Abedinzade Zare,
  • M. Vafadar,
  • M. Behroozibakhsh,
  • A. Hashemian,
  • M. Lari,
  • S. Abtahi

摘要

Purpose

This study aimed to compare the effect of water-based ammonia-free silver fluoride (SF) and silver diammine fluoride (SDF) on the microshear bond strength (MSBS) of resin-modified glass ionomer (RMGIC) to artificially demineralised primary tooth dentine.

Methods

Twenty-four extracted primary molars were prepared to expose mid-coronal dentine; two bonding sites per tooth (total = 48 specimens) were chemically demineralised (pH 4.8) to simulate active caries. Specimens were randomised into three groups (n = 16): SF (Riva Star Aqua), SDF (Cariestop 30%), and Control (distilled water). RMGIC (Riva Light Cure HV) was bonded and stored for 24 h at 37 °C. MSBS was measured using a universal testing machine, and failure modes were analysed using a stereomicroscope. Data were analysed using one-way ANOVA with Tamhane's T2 post hoc test (α = 0.05).

Results

The SF group exhibited significantly lower bond strength (3.65 ± 1.80 MPa) than the Control (6.86 ± 3.15 MPa, p < 0.01) and SDF groups (6.65 ± 4.80 MPa, p < 0.05). No significant difference was found between SDF and Control (p > 0.05); however, the SDF group demonstrated greater variability, consistent with Weibull analysis. Adhesive failure predominated across all groups, with SDF showing more mixed failures.

Conclusion

Water-based SF significantly compromised RMGIC adhesion to demineralised primary tooth dentine. SDF maintained comparable mean bond strength to the control but with higher variability. Ammonia-free SF formulations may reduce immediate RMGIC retention when used before restoration, and this interaction may warrant protocol optimisation in SMART-based applications.