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Biofilm growth inhibition on novel Polylysine and Monocalcium phosphate containing dental composites

Alostad, Manar; (2020) Biofilm growth inhibition on novel Polylysine and Monocalcium phosphate containing dental composites. Doctoral thesis (D.Dent), UCL (University College London). Green open access

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Abstract

Aim The aim of this study was to assess whether or not increasing levels of antibacterial polylysine (PLS) and monocalcium phosphate (MCPM) within dental composites can reduce Streptococcus mutans biofilm formation on surfaces. Methods Five experimental composites were prepared with PLS (4,6,8 wt. %) and MCPM (8,12, 16 wt.%). Control samples were commercial materials Z250 (3M), Activa , Fuji II and the same experimental samples with no PLS or MCPM. Set discs (10mm diameter and 1mm depth) were immersed in 1 ml BHI broth with 1% (w/v) sucrose and 5*106 S. mutans then incubated in air with 5% CO2 for 24 hours. In each experiment, 3 discs with the same formula were tested 3 times (n=3x3). Biofilm thickness and mass on material surfaces were determined using confocal microscopy and crystal violet (CV) staining. Results CV optical density decreased when MCPM and PLS concentrations were increased. Composite formula with MCPM 16 and PLS 8 showed the lowest level of bacterial reduction. Biofilm thickness was between 120 and 150 microns for all the commercial materials and the experimental control. With 4% and 8% PLS, biofilm thickness declined to 70 and 40 microns whilst 8% and 16% MCPM gave an average thickness of 60 and 50 micron, respectively. Biofilm mass decreased by 55% when PLS was increased from 4% to 8%, however, increasing MCPM from 8% to 16% did not affect the results. Conclusion Doubling PLS content in composites caused a greater reduction in biofilm growth on dental composites than doubling MCPM.

Type: Thesis (Doctoral)
Qualification: D.Dent
Title: Biofilm growth inhibition on novel Polylysine and Monocalcium phosphate containing dental composites
Event: UCL University College London
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute
URI: https://discovery.ucl.ac.uk/id/eprint/10118748
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