Microbial tribology and disruption of dental plaque bacterial biofilms
Microbial tribology and disruption of dental plaque bacterial biofilms
We investigate tooth wear in the context of removing dental plaque biofilms from tooth surfaces using high velocity water droplets. A laboratory model system was designed using a dextran gel as a biofilm surrogate and a typodont model was used to reproduce the geometry of the mouth. Using uni-axial compression, the elastic modulus of Streptococcus mutans biofilms was 0.280 kPa (±0.350; n=30), and the relaxation time was 11 s (±12; n=10). The type of surface, concentration of sugar, chelation and osmotic pressure all had significant effects on biofilm stiffness. However, there was no direct relationship between biofilm stiffness and surface hydrophobicity or roughness. The elastic modulus of the gel was 17 kPa (±12; n=3), and the relaxation time was 15 s (±12; n=3) which was in the reported viscoelastic range of real bacterial biofilms. High velocity 115 ?L water drops travelling with an exit velocity of 60 m/s were generated using a prototype interdental cleaning device (Sonicare AirFloss). High-speed imaging showed that the gel was removed within approximately 6 ms of impact by adhesive failure from the tooth surface and within approximately 26 ms of impact by cohesive failure.
microbial tribology, uni-axial compression, dental plaque biofilm, sonicare airFloss, high-speed imaging
276-284
Rmaile, Amir
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Carugo, Dario
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Capretto, Lorenzo
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Zhang, Xunli
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Wharton, Julian A.
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Thurner, Philipp J.
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Aspiras, Marcelo
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Ward, Marylin
01865aa2-01b8-497e-9396-75eb5be71e99
Stoodley, Paul
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30 August 2013
Rmaile, Amir
86affd59-4497-4b56-8247-f0b014c6edb2
Carugo, Dario
0a4be6cd-e309-4ed8-a620-20256ce01179
Capretto, Lorenzo
0f3586b5-1560-49c1-a76b-59e74ea600ef
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Wharton, Julian A.
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Thurner, Philipp J.
ab711ddd-784e-48de-aaad-f56aec40f84f
Aspiras, Marcelo
c8862cf7-23b3-438b-a56f-6ba9d2346fba
Ward, Marylin
01865aa2-01b8-497e-9396-75eb5be71e99
Stoodley, Paul
08614665-92a9-4466-806e-20c6daeb483f
Rmaile, Amir, Carugo, Dario, Capretto, Lorenzo, Zhang, Xunli, Wharton, Julian A., Thurner, Philipp J., Aspiras, Marcelo, Ward, Marylin and Stoodley, Paul
(2013)
Microbial tribology and disruption of dental plaque bacterial biofilms.
Wear, 306 (1-2), .
(doi:10.1016/j.wear.2013.02.010).
Abstract
We investigate tooth wear in the context of removing dental plaque biofilms from tooth surfaces using high velocity water droplets. A laboratory model system was designed using a dextran gel as a biofilm surrogate and a typodont model was used to reproduce the geometry of the mouth. Using uni-axial compression, the elastic modulus of Streptococcus mutans biofilms was 0.280 kPa (±0.350; n=30), and the relaxation time was 11 s (±12; n=10). The type of surface, concentration of sugar, chelation and osmotic pressure all had significant effects on biofilm stiffness. However, there was no direct relationship between biofilm stiffness and surface hydrophobicity or roughness. The elastic modulus of the gel was 17 kPa (±12; n=3), and the relaxation time was 15 s (±12; n=3) which was in the reported viscoelastic range of real bacterial biofilms. High velocity 115 ?L water drops travelling with an exit velocity of 60 m/s were generated using a prototype interdental cleaning device (Sonicare AirFloss). High-speed imaging showed that the gel was removed within approximately 6 ms of impact by adhesive failure from the tooth surface and within approximately 26 ms of impact by cohesive failure.
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Published date: 30 August 2013
Additional Information:
Corresponding author: Amir Rmaile;
Contact email: ar1a09@soton.ac.uk
Keywords:
microbial tribology, uni-axial compression, dental plaque biofilm, sonicare airFloss, high-speed imaging
Organisations:
Bioengineering Group, nCATS Group
Identifiers
Local EPrints ID: 350845
URI: http://eprints.soton.ac.uk/id/eprint/350845
ISSN: 0043-1648
PURE UUID: 940f194c-7421-4b4b-9fd7-a7b7f4fe4fc2
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Date deposited: 09 Apr 2013 13:40
Last modified: 15 Mar 2024 03:34
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Author:
Amir Rmaile
Author:
Lorenzo Capretto
Author:
Marcelo Aspiras
Author:
Marylin Ward
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