The antimicrobial effect of simultaneously applying different diode lasers and silver nanoparticles synthesized by laser ablation on bacterial dental caries

• Published in: Applied nanoscience 2023-08, Vol.13 (8), p.5589-5603
• Main Authors: Abbas, Ruaa H., Haleem, Azhar M., Kadhim, A.
• Format: Article
• Language: English
• Subjects: Ablation; Absorption spectra; Bacteria; Chemistry and Materials Science; Colloids; Dental caries; Distilled water; Field emission microscopy; Fourier transforms; Infrared analysis; Laser ablation; Lasers; Materials Science; Membrane Biology; Microscopy; Nanochemistry; Nanoparticles; Nanotechnology; Nanotechnology and Microengineering; Neodymium lasers; Original Article; Pulse duration; Semiconductor lasers; Silver; Sodium dodecyl sulfate; Spectrum analysis; Synthesis; Transmission electron microscopy; X-ray diffraction; YAG lasers; Zeta potential
• ISSN: 2190-5509; 2190-5517
• DOI: 10.1007/s13204-023-02776-8

Silver nanoparticles (Ag NPs) were synthesized with laser ablation of a silver plate immersed in double-distilled water (DDW) and sodium dodecyl sulphate (SDS), respectively. The target was irradiated with a pulsed Nd:YAG laser at 1064 nm with an energy of 600 mJ, a pulse duration of 10 ns, and a repetition rate of 5 Hz. The diode lasers of 635 nm wavelength at 1000 mW and wavelengths of 445 nm and 650 nm at 100 mW, respectively, were used for a combined treatment of Streptococus mutans . The Ag NPs colloidal samples were analyzed using UV–Vis spectroscopy, the Fourier transform infrared (FTIR), the zeta potential (ZP), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The absorption spectra of Ag NP colloidal samples showed peaks at 410 and 420 nm for DW and SDS, respectively. Ag NPs' colloidal results are (− 10 mV, 3 mV) for negatively charged, neutral for SDS, and DDW, respectively. The XRD pattern of the NPs revealed the presence of Ag phase planes (111), (200), (220), and (311). FESEM images of all produced samples reveal the synthesis of spherical nanostructures and the presence of large particles as a result of aggregation. The TEM images revealed nearly spherical NPs, with sizes ranging from 5 to 45 and 5–30 nm for Ag NPs prepared with DDW and SDS, respectively. The Ag NPs with concentrations of (0.0, 25, 50, 100, and 200) µg/mL and the Ag NPs concentrations of (0.0, 25, 50, 75, and 100) µg/mL combined with diode laser radiation, respectively, were tested for antibacterial activity against Streptococcus mutans . Ag NPs combined with the diode lasers showed a greater inhibition rate against Streptococcus mutans .