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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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  11. In Vitro Antimicrobial Activity Of Silver Nanoparticles Synthesis By Lasers Against Teeth Caries Bacteria (s-mutans).
  1. Home
  3. Research Domains
  5. Biomedical And Clinical Sciences
  7. Dentistry
  9. Dental Materials And Equipment
  11. In Vitro Antimicrobial Activity Of Silver Nanoparticles Synthesis By Lasers Against Teeth Caries Bacteria (s-mutans).

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In vitro antimicrobial activity of silver nanoparticles synthesis by lasers against teeth caries bacteria (S-mutans).

Mays S Tareq1, Ali K Hameed2, Ali H Saleem3

  • 1College of Applied Sciences, University of Technology, Baghdad, Iraq. mays.s.tareq@uotechnology.edu.iq.

Lasers in Medical Science
|June 11, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Laser-synthesized silver nanoparticles show potent antibacterial effects against S. mutans. Smaller nanoparticles (20 nm) exhibited enhanced efficacy, with optimal activity observed after two months due to silver ion oxidation.

Keywords:
Antibacterial activityFiber laserPlasmonic resonancePulsed laser ablation in liquid (PLAL)

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Microbiology

Background:

  • Dental caries, primarily caused by Streptococcus mutans, poses a significant oral health challenge.
  • Developing novel antibacterial agents is crucial for combating drug-resistant bacterial strains.
  • Silver nanoparticles (Ag NPs) are recognized for their broad-spectrum antimicrobial properties.

Purpose of the Study:

  • To synthesize silver nanoparticles (Ag NPs) using dual-laser techniques for comparative antibacterial evaluation.
  • To investigate the influence of laser parameters on Ag NP characteristics and antibacterial efficacy against S. mutans.
  • To explore the role of aging on the antibacterial activity of laser-synthesized Ag NPs.

Main Methods:

  • Silver nanoparticles were synthesized using pulsed laser ablation (Nd: YAG) and subsequent laser fragmentation (fiber laser).
Silver nanoparticles (Ag NPs)
  • Characterization involved UV-Vis spectroscopy, zeta potential, Transmission Electron Microscopy (TEM), and Atomic Force Microscopy (AFM).
  • Antibacterial activity was assessed against S. mutans, determining the inhibition zone and minimum effective concentration.

    • Main Results:

    • TEM revealed spherical Ag NPs with an average size of approximately 20 nm.
    • AFM indicated mean diameters of 34 nm (Nd: YAG) and 16 nm (fiber laser), with varying roughness.
    • Smaller Ag NPs (around 20 nm) demonstrated superior antibacterial activity, achieving a 25 mm inhibition zone at a minimum effective concentration of 6 µg/ml.
    • Antibacterial efficacy increased with aging up to two months, attributed to silver ion oxidation.

    Conclusions:

    • Dual-laser synthesis offers a controllable method for producing Ag NPs with tunable properties.
    • Smaller Ag NP size is directly correlated with enhanced antibacterial efficacy against S. mutans.
    • The aging process enhances the antibacterial performance of Ag NPs, highlighting their potential in dental applications.