Sarah Jackson1, Lisa Coulthwaite2, Zvi Loewy3, Anthony Scallan4, Joanna Verran5. 1. Postgraduate student, School of Health Care Science, Manchester Metropolitan University, Manchester, United Kingdom. 2. Senior Lecturer, School of Health Care Science, Manchester Metropolitan University, Manchester, United Kingdom. 3. Interim Dean, Touro College of Pharmacy, New York, NY; Professor, Pharmaceutical & Biomedical Sciences, New York Medical College, New York, NY. 4. Senior Lecturer, School of Computing, Maths and Digital Technology, Manchester Metropolitan University, Manchester, United Kingdom. 5. Professor, School of Health Care Science, Manchester Metropolitan University, Manchester, United Kingdom. Electronic address: J.Verran@mmu.ac.uk.
Abstract
STATEMENT OF PROBLEM: Candida albicans is a known etiologic agent of denture stomatitis. Candida hyphae exhibit the ability to respond directionally to environmental stimuli. This characteristic is thought to be important in the penetration of substrata such as resilient denture liners and host epithelium. It has been suggested that hyphal production also enhances adhesion and survival of Candida on host and denture surfaces. Surface roughness, in addition, can enhance adhesion where stronger interactions occur between cells and surface features of similar dimensions. PURPOSE: The purpose of this study was to assess the development of hyphal and blastospore biofilms on abraded denture acrylic resin specimens and measure the ease of removal of these biofilms. MATERIAL AND METHODS: Biofilms were grown for 48 hours on abraded 1-cm² denture acrylic resin specimens from adhered hyphal phase C albicans or from adhered blastospores. Subsequently, all specimens were stained with Calcofluor White and examined with confocal scanning laser microscopy. Biofilms were removed by vortex mixing in sterile phosphate buffered saline solution. Removed cells were filtered (0.2-μm pore size). Filters were dried at 37°C for 24 hours for dry weight measurements. Any cells that remained on the acrylic resin specimens were stained with 0.03% acridine orange and examined with epifluorescence microscopy. RESULTS: Biofilms grown from both cell types contained all morphologic forms of C albicans. Although the underlying surface topography did not affect the amount of biofilm produced, biofilms grown from hyphal phase Candida were visibly thicker and had greater biomass (P<.05). These biofilms were less easily removed from the denture acrylic resin, especially in the case of rougher surfaces, evidenced by the higher numbers of retained cells (P≤.05). CONCLUSION: The presence of hyphae in early Candida biofilms increased biofilm mass and resistance to removal. Increased surface roughness enhances retention of hyphae and yeast cells, and, therefore, will facilitate plaque regrowth. Therefore, minimization of denture abrasion during cleaning is desirable.
STATEMENT OF PROBLEM: Candida albicans is a known etiologic agent of denture stomatitis. Candida hyphae exhibit the ability to respond directionally to environmental stimuli. This characteristic is thought to be important in the penetration of substrata such as resilient denture liners and host epithelium. It has been suggested that hyphal production also enhances adhesion and survival of Candida on host and denture surfaces. Surface roughness, in addition, can enhance adhesion where stronger interactions occur between cells and surface features of similar dimensions. PURPOSE: The purpose of this study was to assess the development of hyphal and blastospore biofilms on abraded denture acrylic resin specimens and measure the ease of removal of these biofilms. MATERIAL AND METHODS: Biofilms were grown for 48 hours on abraded 1-cm² denture acrylic resin specimens from adhered hyphal phase C albicans or from adhered blastospores. Subsequently, all specimens were stained with Calcofluor White and examined with confocal scanning laser microscopy. Biofilms were removed by vortex mixing in sterile phosphate buffered saline solution. Removed cells were filtered (0.2-μm pore size). Filters were dried at 37°C for 24 hours for dry weight measurements. Any cells that remained on the acrylic resin specimens were stained with 0.03% acridine orange and examined with epifluorescence microscopy. RESULTS: Biofilms grown from both cell types contained all morphologic forms of C albicans. Although the underlying surface topography did not affect the amount of biofilm produced, biofilms grown from hyphal phase Candida were visibly thicker and had greater biomass (P<.05). These biofilms were less easily removed from the denture acrylic resin, especially in the case of rougher surfaces, evidenced by the higher numbers of retained cells (P≤.05). CONCLUSION: The presence of hyphae in early Candida biofilms increased biofilm mass and resistance to removal. Increased surface roughness enhances retention of hyphae and yeast cells, and, therefore, will facilitate plaque regrowth. Therefore, minimization of denture abrasion during cleaning is desirable.
Authors: Julyana de Araújo Oliveira; Ingrid Carla Guedes da Silva; Leonardo Antunes Trindade; Edeltrudes Oliveira Lima; Hugo Lemes Carlo; Alessandro Leite Cavalcanti; Ricardo Dias de Castro Journal: Evid Based Complement Alternat Med Date: 2014-12-09 Impact factor: 2.629
Authors: Gabriela Lacet Silva Ferreira; Pedro Luiz Rosalen; Larissa Rangel Peixoto; Ana Luiza Alves de Lima Pérez; Fabíola Galbiatti de Carvalho Carlo; Lúcio Roberto Cançado Castellano; Jefferson Muniz de Lima; Irlan Almeida Freires; Edeltrudes de Oliveira Lima; Ricardo Dias de Castro Journal: Molecules Date: 2017-09-17 Impact factor: 4.411