Interfacial free energy as a driving force for pellicle formation in the oral cavity: An<i>in vivo</i>study in beagle dogs

Dijk, L. J. van; Goldsweer, R; Busscher, Henk J.

doi:10.1080/08927018809378093

Cited by 33 publications

(13 citation statements)

References 20 publications

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“…Incubation of stainless steel and germanium (both fully wettable), polypropylene (water contact angle 100 degrees) and Perspex (water contact angle 73 degrees) in different environmental waters for 1 h resulted in a mean water contact angle for all conditioned surfaces of 61±28 degrees (Schneider & Marshall, 1994). However, also surfaces exposed to other environments, as for example in the oral cavity containing much higher concentrations of dissolved compounds, gave water contact angles between 50 and 70 degrees (Van Dijk et al, 1988). Although surfaces end up with a similar hydrophobicity, heterogeneous dissolved organic carbon compounds in the natural seawater can generate films with different properties with respect to bacterial adhesion.…”

Section: Discussionmentioning

confidence: 99%

Multiple linear regression analysis of bacterial deposition to polyurethane coatings after conditioning film formation in the marine environment

et al. 2004

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Many studies have shown relationships of substratum hydrophobicity, charge or roughness with bacterial adhesion, although bacterial adhesion is governed by interplay of different physico-chemical properties and multiple regression analysis would be more suitable to reveal mechanisms of bacterial adhesion. The formation of a conditioning film of organic compounds adsorbed from seawater affects the properties of substratum surfaces prior to bacterial adhesion, which is a complicating factor in studying the mechanism of bacterial adhesion. In this paper, the impact of conditioning films adsorbed from natural seawater to four polyurethane coatings with different hydrophobicity, elasticity and roughness was studied for three different marine bacterial strains in a multiple linear regression analysis. The water contact angle on hydrophobic coatings decreased on average by 8 degrees and increased on average by the same amount on hydrophilic coatings. These changes were accompanied by increased concentrations of oxygen and nitrogen on the surface as determined by X-ray photoelectron spectroscopy, indicative of adsorption of proteinaceous material. Furthermore, the mean surface roughness increased on average by 4 nm after conditioning film formation. Multiple linear regression analysis revealed that changes in deposition due to conditioning film formation of Marinobacter hydrocarbonoclasticus, Psychrobacter sp. SW5H and Halomonas pacifica in a stagnation-point flow chamber could be explained in a model comprising hydrophobicity and the prevalence of nitrogen-rich components on the surface for the most hydrophobic strain. For the two more hydrophilic strains, deposition was governed by a combination of surface roughness and hydrophobicity. Elasticity was not a factor in bacterial adhesion to conditioning films.

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Section: Discussionmentioning

confidence: 99%

Multiple linear regression analysis of bacterial deposition to polyurethane coatings after conditioning film formation in the marine environment

et al. 2004

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“…; low s.f.e. values increased, whereas higher values decreased (Van Dijk et al, 1987, 1988 by Schakenraad et al (1986) for the adhesion of human fibroblasts to serum-coated substrata; by Dexter and Lucas (1985) for bacterial adhesion to an adsorbed multi-component organic layer; and by Pratt-Terpstra et al (1987) for bacterial adhesion to albumin-coated surfaces. Possible explanations for this finding are: (1) the fact that the adsorbed pellicle itself provides a means of information transferral that could be due to differences in the molecular compositions of the adsorbed protein layers, differences in the conformation of adsorbed molecules, differences in the time constants of the adsorption process, or a combination of the above possibilities (Dexter, 1979); (2) differences in the amount of adsorbed molecules; and (3) differences in the surface coverage, i.e., the presence of either a continuous film or a patchwork pattern (Hlady et al, 1986).…”

Section: Discussionmentioning

confidence: 99%

The Influence of Surface Free-energy on Planimetric Plaque Growth in Man

et al. 1989

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The purpose of this study was to examine the change in plaque area over nine days in vivo on four materials with different sinface freeenergies (s.f e.). Twelve healthy dental students participated in a crossover, split-mouth, double-blind study. Supragingivalplaqueformation was recorded over a nine-day period, on four different materials: fluorethylenepropylene (Teflon) (FEP), parafilm (PAR), cellulose acetate (CA), and enamel (E) with s.f. e. of 20, 26, 57, and 88 erg/cm2, respectively. Strips made from the first three materials were stack to the buccal surface of an upper incisor. The remaining incisor was carefully polished and served as an enamel surface. The increase in plaque was evaluated after three, six, and nine days. A planimetrical analysis was used so that the plaque area could be expressed as a percentage of the total buccal tooth surface. This procedure was repeated on each subject, so that at the end, each pair of central or lateral incisors received the four tested materials.The results indicated that the adherence of micro-organisms on pellicle-coated substrata was influenced by the material's s.f e.; there was an association between the s.fje. of the substrata and the supragingival plaque extension in vivo. High surface free-energy substrata in the oral cavity attracted more micro-organisms than did low energetic materials. Additionally, the bacterial adhesion seemed very weak on surfaces with a low s.f e. J Dent Res 68(5): 796-799, May, 1989 Introduction.

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“…Yet, the relationships are convincing and without major outliers. In the past, it has been suggested that salivary protein formation converges the surface energy of different nonbiological substratum surfaces in the oral cavity [17], but this has never been shown for salivary conditioning film formation on a treated biological film as the SCF. Moreover, by virtue of the LW-AB analysis of measured contact angles, the role of acid–base interactions in renewed SCF formation on treated SCFs has become clear here.…”

Section: Discussionmentioning

confidence: 99%

Surface thermodynamic homeostasis of salivary conditioning films through polar–apolar layering

Mei

Atema-Smit

et al. 2011

Clin Oral Invest

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Salivary conditioning films (SCFs) form on all surfaces exposed to the oral cavity and control diverse oral surface phenomena. Oral chemotherapeutics and dietary components present perturbations to SCFs. Here we determine the surface energetics of SCFs through contact angle measurements with various liquids on SCFs following perturbations with a variety of chemotherapeutics as well as after renewed SCF formation. Sixteen-hour SCFs on polished enamel surfaces were treated with a variety of chemotherapeutics, including toothpastes and mouthrinses. After treatment with chemotherapeutics, a SCF was applied again for 3 h. Contact angles with four different liquids on untreated and treated SCF-coated enamel surfaces were measured and surface free energies were calculated. Perturbations either caused the SCF to become more polar or more apolar, but in all cases, renewed SCF formation compensated these changes. Thus, a polar SCF attracts different salivary proteins or adsorbs proteins in a different conformation to create a more apolar SCF surface after renewed SCF formation and vice versa for apolar SCFs. This polar–apolar layering in SCF formation presents a powerful mechanism in the oral cavity to maintain surface thermodynamic homeostasis—defining oral surface properties within a narrow, biological range and influencing chemotherapeutic strategies. Surface chemical changes brought about by dietary or chemotherapeutic perturbations to SCFs make it more polar or apolar, but new SCFs are rapidly formed compensating for changes in surface energetics.

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Interfacial free energy as a driving force for pellicle formation in the oral cavity: Anin vivostudy in beagle dogs

Cited by 33 publications

References 20 publications

Multiple linear regression analysis of bacterial deposition to polyurethane coatings after conditioning film formation in the marine environment

Multiple linear regression analysis of bacterial deposition to polyurethane coatings after conditioning film formation in the marine environment

The Influence of Surface Free-energy on Planimetric Plaque Growth in Man

Surface thermodynamic homeostasis of salivary conditioning films through polar–apolar layering

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