.2020 Jul 27;10(8):1466.

doi: 10.3390/nano10081466.

Evaluation of the Shear Bond Strength and Antibacterial Activity of Orthodontic Adhesive Containing Silver Nanoparticle, an In-Vitro Study

Ladan Eslamian^{1 2}, Ali Borzabadi-Farahani^{3 4}, Shahedeh Karimi⁵, Sepideh Saadat⁵, Mohammad Reza Badiee²

Affiliations

¹ Dentofacial Deformities Research Center, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran 19857-17443, Iran.
² Department of Orthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran 19857-17443, Iran.
³ Orthodontics, Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, 00183 Rome, Italy.
⁴ Private Practice, Finchley Orthodontics, North Finchley, London N12 9EN, UK.
⁵ School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran 19857-17443, Iran.

PMID:32727028
PMCID: PMC7466539
DOI: 10.3390/nano10081466

Evaluation of the Shear Bond Strength and Antibacterial Activity of Orthodontic Adhesive Containing Silver Nanoparticle, an In-Vitro Study

Ladan Eslamian et al. Nanomaterials (Basel).2020.

.2020 Jul 27;10(8):1466.

doi: 10.3390/nano10081466.

Authors

Ladan Eslamian^{1 2}, Ali Borzabadi-Farahani^{3 4}, Shahedeh Karimi⁵, Sepideh Saadat⁵, Mohammad Reza Badiee²

Affiliations

¹ Dentofacial Deformities Research Center, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran 19857-17443, Iran.
² Department of Orthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran 19857-17443, Iran.
³ Orthodontics, Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, 00183 Rome, Italy.
⁴ Private Practice, Finchley Orthodontics, North Finchley, London N12 9EN, UK.
⁵ School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran 19857-17443, Iran.

PMID:32727028
PMCID: PMC7466539
DOI: 10.3390/nano10081466

Abstract

This study evaluated the effect of incorporating silver nanoparticles (AgNPs) into conventional orthodontic adhesive on its antibacterial activity and the shear bond strength (SBS) to stainless steel orthodontic brackets. Thirty-four extracted premolars were randomly allocated into two groups (n = 17). Orthodontic adhesive (Transbond XT, 3M Unitek) was blended with AgNPs (50 nm, 0.3%w/w) to form a nano-adhesive. In order to bond stainless steel twin brackets (0.022-inch, American Orthodontics), Transbond XT (n = 17) and nano-adhesive (n = 17) were used in each group, respectively, after acid etching (37% phosphoric acid, 30 s) and rinsing with water (15 s). SBS and the adhesive remnant index (ARI) scores were recorded. Antibacterial activity againstStreptococcus mutans in both groups after 24 h and 30 days was assessed (Disc agar diffusion test) and the inhibition zone diameter around each specimen was measured and recorded. Adding AgNPs significantly (p = 0.009) reduced the mean (SD) SBS in the nano-adhesive group [10.51(7.15) MPa] compared to Transbond XT [17.72(10.55) MPa]. The ARI scores on the Transbond XT and nano-adhesive showed no statistically significant difference (p = 0.322). Nano-adhesive with AgNPs showed significant antibacterial activity againstStreptococcus mutans at 24 h and 30 days (p < 0.001). In both groups, no significant decline in the zones of inhibition was detected after 30 days (p = 0.907). The findings suggest that SBS decreased after incorporation of AgNPs [0.3% (w/w)], but was still above the recommended SBS of 5.9-7.8 MPa. The nano-adhesive showed significant antibacterial activity which did not change much after 30 days.

Keywords: adhesive remnant index; antibacterial; caries inhibition; orthodontics; remineralization; shear bond strength; silver nanoparticles.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

**Figure 1**
The scanning electron microscopy (SEM) view of the nano-adhesive under scanning electron microscope.

**Figure 2**
Inhibition zone diameter for conventional adhesive and nano-adhesive at 24 h and 30 days (mm). No interaction effect can be seen as there is a set of nearly parallel lines for both conventional adhesive and nano-adhesive.

See this image and copyright information in PMC

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Evaluation of the Shear Bond Strength and Antibacterial Activity of Orthodontic Adhesive Containing Silver Nanoparticle, an In-Vitro Study

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Evaluation of the Shear Bond Strength and Antibacterial Activity of Orthodontic Adhesive Containing Silver Nanoparticle, an In-Vitro Study

Authors

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Abstract

Conflict of interest statement

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