Clinical relevance of the influence of surface free energy and roughness on the supragingival and subgingival plaque formation in man

Quirynen, Marc; Vandermei, Hc; Bollen, Curd; Geertsemadoornbusch, Gi; Busscher, Hj; Vansteenberghe, D

doi:10.1016/0927-7765(94)80014-6

Cited by 17 publications

(13 citation statements)

References 23 publications

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“…13 Bacteria with low free energy tend to attach to surfaces with low SFE, and the exact opposite applies to microbes with high SFE. 14,15 However, the SFE of a substrate is a weaker determinant of bacterial adhesion compared with its surface roughness, 16 and these properties are also affected by the acquired salivary pellicle. 17,18 Although various studies [19][20][21] have shown that laboratory and chairside polishing techniques can achieve a surface roughness below the 0.2-μm threshold for the polishing surfaces of intraoral removable prostheses made of PMMA, this does not hold true for the fitting surfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA

Bourlidi

Qureshi²,

Soo

et al. 2016

The Journal of Prosthetic Dentistry

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Statement of the Problem. The colonization of micro-organisms on acrylic resin dentures may result in denture-induced stomatitis. No efficient coating has yet been proposed to address this issue. Purpose. The purpose of this in vitro study was to assess the effect of various initial surface finishes and different Parylene (P) coating thicknesses on the surface roughness (Ra) and surface free energy (SFE) of Parylene coated polymethyl methacrylate (PMMA). Material and Methods. One hundred and sixty PMMA specimens were produced and divided into 8 groups as follows: Group A: uncoated-1000grit finish; group Ap1: 10 μm P coated -1000grit finish; group B: uncoated -1200grit finish; group Bp: 10 μm P coated -1200grit finish; group C: uncoated2400grit finish; group Cp: 10 μm P coated -2400grit finish; group Ap2: 20 μm P coated -1000grit finish; group Ap3: 30 μm P coated -1000grit finish. The Ra of all specimens was measured with a noncontact profilometer. To calculate the SFE, the Owens-Wendt approach was applied after measuring the contact angles with a goniometer. The topography of the specimens was observed by scanning electron microscope. I am happy to report that the reviewers of manuscript #JPD-D-15-00013R3, entitled "The effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA," have recommended that it be accepted for publication, pending your responses to the following final requests:Please review the edited manuscript to ensure that your meaning has not been inadvertently altered. Please address the comments.Answer: Thank you for the acceptance of our work for publication to the JPD. We are now submitting the final revision of the manuscript entitled "The effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA". We have accepted all Track Changes and responded to the minor queries requested. The additions are marked in blue as per the instructions.We have uploaded the TIFF files of the images without labels as requested. The images uploaded are not in composite form, but individual images. We have only left the composite images in the manuscript file for ease of final proof editing by your team.

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Section: Introductionmentioning

confidence: 99%

Effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA

Bourlidi

Qureshi²,

Soo

et al. 2016

The Journal of Prosthetic Dentistry

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“…Plaque adheres to surfaces via this organic component 38) . Surface free energy is another determinant of biofilm formation, and micro-organisms preferentially adhere to surfaces possessing similar surface free energy levels 34) , although the mechanism is not yet defined. The results of this study showed that Parylene C coated samples, exposed to either Poligrip or air exhibited higher mean SFE values compared to noncoated.…”

Section: Discussionmentioning

confidence: 99%

“…Two important properties that influence biofilm organization and retention are surface roughness and surface free energy 32,34) . The results of this study clearly show that, regardless of the medium, Parylene coating led to a statistically significant reduction in mean surface roughness values of the PMMA samples tested.…”

Section: Discussionmentioning

confidence: 99%

“…Micro-organisms with low free energy tend to attach to surfaces with low SFE and the opposite applies to ones with high SFE 33) . In other words, microorganisms preferentially adhere to surfaces possessing similar energy levels 34) . However, the SFE of a substrate is a weaker determinant of bacterial adhesion compared to its surface roughness and these properties are also affected by the acquired salivary pellicle 35,36) .…”

Section: Introductionmentioning

confidence: 99%

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The effect of different chemical intra-oral prostheses cleansers on the surface properties of Parylene-coated PMMA

et al. 2017

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The purpose of this study was to investigate the effect of different chemical intra-oral prosthesis cleansers on the surface properties of Parylene-C coated and non-coated polymethyl methacrylate (PMMA). A total of 120 PMMA samples were prepared. Half of the samples were coated with 10 µm of Parylene-C. Samples were exposed to either air (control) or one of two types of denture cleansers, an alkaline peroxide cleanser (Steradent) or a neutral peroxide cleanser with enzyme (Poligrip). Surface roughness (Ra) and surface free energy (SFE) values were measured and compared between groups. Scanning electron microscopy was used for visual analysis. The samples coated with Parylene exhibited significantly lower mean Ra values compared to the non-coated samples (p<0.001). Immersion in Steradent increased the roughness of non-coated PMMA, but its effect was minimized on the coated surfaces. SFE increased for the samples exposed to air and Poligrip, but decreased for the samples exposed to Steradent.

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“…Being able to reduce the surface free energy of a material in a clinical situation would directly influence the amounts of initial microbial attachment [44,45]. This may be of particular importance in medicine and dentistry in the case of PMMA, which has been proven to retain such fungal and bacterial biofilms when used for the fabrication of intraoral prostheses.…”

Section: Surface Free Energymentioning

confidence: 99%

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

2014

J Chem Appl

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Background and objective: Parylenes are conformal protective polymer coating materials utilized in various biomedical applications since they are chemically and biologically inert and stable. Acrylic resins, used in the manufacturing of different types of intra-oral prostheses, are vulnerable to fluid sorption and solubility and consequently alteration of different physical and mechanical properties. This study investigated the effect of surface coating of polymethyl methacrylate (PMMA) with Parylene-C, on surface free energy, water sorption, solubility, and staining.Methods: Specimens were fabricated using heat-polymerizing PMMA, half were randomly chosen to be coated with Parylene-C and various groups were created for testing as follows: 24 specimens were subjected to water sorption and solubility tests in distilled water according to ISO 20795-1:2008 for denture base polymers. 48 specimens underwent staining tests by soaking in distilled water or coffee solution for one week. Discoloration was measured by comparing total colour differences (ΔE) and lightness values (L*) across groups after obtaining CIE L*a*b* values of all samples using a digital camera imaging and appropriate image analysis software. A further 40 samples were subjected to contact angle readings using deionized water and glycerol followed by surface free energy calculations. Nonparametric Mann-Whitney tests were used for statistical analysis (P<0.01).Results: Coated PMMA specimens demonstrated significantly less water sorption and lower surface free energy compared to noncoated (P <0.001), while no significant difference was found in solubility (P= .028). The coating did not have a significant effect on ΔE values after the staining tests, but the L* values in coated samples were significantly higher compared to the uncoated ones.Significance: This study forms part of a series of experiments on the effect of Parylene coating of PMMA. The modified surface properties of coated PMMA may prolong the lifetime of intraoral prostheses and possibly reduce biofilm formation.

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Clinical relevance of the influence of surface free energy and roughness on the supragingival and subgingival plaque formation in man

Cited by 17 publications

References 23 publications

Effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA

Effect of different initial finishes and Parylene coating thickness on the surface properties of coated PMMA

The effect of different chemical intra-oral prostheses cleansers on the surface properties of Parylene-coated PMMA

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

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