Mechanical properties and failure of Streptococcus mutans biofilms, studied using a microindentation device

Cense, AW Arjen; Peeters, Eag Emiel; Gottenbos, B; Baaijens, Fpt Frank; Nuijs, AM; Dongen, van Meh Rini

doi:10.1016/j.mimet.2006.04.023

Cited by 78 publications

(71 citation statements)

References 12 publications

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“…The multilayered biomass composed of glycoproteins, water, nucleic acids, and polysaccharides chains acts as viscoelastic material which can support considerable elastic deformation under shear stresses and is able to distribute loads, thereby decreasing the contact pressure at the surface [12,13,[73][74][75]. Also, that viscoelastic biomass can be responsible for the friction on oral surfaces [12].…”

Section: Presence Of Oral Biofilmsmentioning

confidence: 99%

Wear and Corrosion Interactions on Titanium in Oral Environment: Literature Review

et al. 2015

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The oral cavity is a complex environment where corrosive substances from dietary, human saliva, and oral biofilms may accumulate in retentive areas of dental implant systems and prostheses promoting corrosion at their surfaces. Additionally, during mastication, micromovements may occur between prosthetic joints causing a relative motion between contacting surfaces, leading to wear. Both processes (wear and corrosion) result in a biotribocorrosion system once that occurs in contact with biological tissues and fluids. This review paper is focused on the aspects related to the corrosion and wear behavior of titanium-based structures in the oral environment. Furthermore, the clinical relevance of the oral environment is focused on the harmful effect that acidic substances and biofilms, formed in human saliva, may have on titanium surfaces. In fact, a progressive degradation of titanium by wear and corrosion (tribocorrosion) mechanisms can take place affecting the performance of titanium-based implant and prostheses. Also, the formation of wear debris and metallic ions due to the tribocorrosion phenomena can become toxic for human tissues. This review gathers knowledge from areas like materials sciences, microbiology, and dentistry contributing to a better understanding of bio-tribocorrosion processes in the oral environment.

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Section: Presence Of Oral Biofilmsmentioning

confidence: 99%

Wear and Corrosion Interactions on Titanium in Oral Environment: Literature Review

et al. 2015

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“…The simplest modelling approaches for biofilms make use of empirical elastic or shear moduli to express a linear relationship between scalar stress and strain measures as in earlier studies [13][14][15][16][17]. The viscoelastic response has classically been interpreted in terms of linear spring-dashpot analogies such as the standard linear solid, the generalized Maxwell or Burgers model [18][19][20][21][22][23][24]. Expressing the relaxation function in terms of a Prony series, Towler et al [25] used the latter model within a commercial finite element program to perform two-dimensional simulations.…”

Section: Introductionmentioning

confidence: 99%

Modelling mechanical characteristics of microbial biofilms by network theory

Ehret

Böl

2013

J. R. Soc. Interface.

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In this contribution, we present a constitutive model to describe the mechanical behaviour of microbial biofilms based on classical approaches in the continuum theory of polymer networks. Although the model is particularly developed for the well-studied biofilms formed by mucoid Pseudomonas aeruginosa strains, it could easily be adapted to other biofilms. The basic assumption behind the model is that the network of extracellular polymeric substances can be described as a superposition of worm-like chain networks, each connected by transient junctions of a certain lifetime. Several models that were applied to biofilms previously are included in the presented approach as special cases, and for small shear strains, the governing equations are those of four parallel Maxwell elements. Rheological data given in the literature are very adequately captured by the proposed model, and the simulated response for a series of compression tests at large strains is in good qualitative agreement with reported experimental behaviour.

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“…Biofilms of various Pseudomonas aeruginosa strains subjected to physical deformations in fluid were shown to be viscoelastic fluids, which behave like elastic solids over periods of a few seconds but like linear viscous fluids over longer times. Therefore in several studies, bacterial biofilms have been reported to behave as viscoelastic materials [38,122,123], while in other studies they are described as elastic [124,125]. Chemical perturbations can reduce biofilm viscoelasticity and hence slow down recovery to their original state [126].…”

Section: Biofilms Contribute To Viscoelasticitymentioning

confidence: 99%

“…The strength and apparent viscoelastic modulus of P. aeruginosa biofilms grown on membrane filters has also been investigated using a uniaxial compression experimental device and a film rheometer [118]. Directly applied and controlled loading forces have been used to quantify various biofilm viscoelasticity parameters, usually without a hydrodynamic flow, for example microbead FS [120], the micro-cantilever technique [130,131], indenters [122] or T-shaped probes [75], which are used to pull (tensile testing under a normal load) or push (compression testing under a normal load) the biofilm (see review 38 and references therein). On the other hand, there are several methods that use hydrodynamic loading, where biofilms are subjected to a fluid flow in flow cells [109,112,132], or Couette-Taylor type reactors [133,134].…”

Section: Biofilms Contribute To Viscoelasticitymentioning

confidence: 99%