Effectiveness of 405-nm blue LED light for degradation of Candida biofilms formed on PMMA denture base resin

Lasers in Medical Science
Chiaki Tsutsumi-AraiKazuhito Satomura

Abstract

This study investigated (i) the degradation effect of 405-nm blue light-emitting diode (LED) light irradiation on Candida albicans and C. glabrata biofilms formed on denture base resin and (ii) the effects of 405-nm blue LED light irradiation on the mechanical and surface characteristics of the resin. Polymethyl methacrylate denture base resin discs were prepared, and C. albicans or C. glabrata biofilms formed on the denture base resin discs. Each biofilm was irradiated with 405-nm blue LED light under a constant output power (280 mW/cm2) for different times in a moisture chamber with 100% relative humidity. Postirradiation, each biofilm was analyzed using a colony-forming unit assay, fluorescence microscopy, and scanning electron microscopy (SEM). Parallelepiped specimens of acrylic resin were prepared, and changes in their flexural strength (FS), flexural modulus (FM), and surface roughness (Ra) preirradiation and postirradiation with 405-nm blue LED light were evaluated. Irradiation for 30 min completely inhibited colony formation in both Candida species. Fluorescence microscopy showed that almost all Candida cells were killed because of irradiation. SEM images showed various cell damage patterns, such as wrinkles, shrinkage...Continue Reading

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Citations

Feb 3, 2021·The Journal of Infectious Diseases·Leon G LeanseTianhong Dai
Nov 18, 2021·Journal of Applied Microbiology·Shae D MorganThomas Roussel
Dec 11, 2021·PloS One·Yuka Shichiri-NegoroNoriyuki Wakabayashi

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