scholarly journals Hydrogel Contact Lenses Surface Roughness and Bacterial Adhesion

10.5772/48436 ◽  
2012 ◽  
Author(s):  
Maria Jesus ◽  
Eva Yebra-Pimentel
Keyword(s):  
Surface Roughness ◽  
Bacterial Adhesion ◽  
Contact Lenses

Comparison of Surface Roughness and Bacterial Adhesion between Cosmetic Contact Lenses and Conventional Contact Lenses

2014 ◽  
Vol 55 (5) ◽  
pp. 646 ◽  
Author(s):  
Yong Woo Ji ◽  
Soon Ho Hong ◽  
Dong Yong Chung ◽  
Eung Kweon Kim ◽  
Hyung Keun Lee
Keyword(s):  
Surface Roughness ◽  
Bacterial Adhesion ◽  
Contact Lenses

Comparison of Surface Roughness and Bacterial Adhesion Between Cosmetic Contact Lenses and Conventional Contact Lenses

2015 ◽  
Vol 41 (1) ◽  
pp. 25-33 ◽  
Author(s):  
Yong Woo Ji ◽  
Young Joo Cho ◽  
Chul Hee Lee ◽  
Soon Ho Hong ◽  
Dong Yong Chung ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Bacterial Adhesion ◽  
Contact Lenses

Effect of surface sealant on surface roughness and bacterial adhesion of bulk-fill composites

2021 ◽  
pp. 096739112110055
Author(s):  
Gunce Ozan ◽  
Meltem Mert Eren ◽  
Cansu Vatansever ◽  
Ugur Erdemir
Keyword(s):  
Surface Roughness ◽  
Bacterial Adhesion ◽  
Confocal Laser ◽  
High Caries Risk ◽  
Two Samples ◽  
Significant Difference ◽  
Restorative Materials ◽  
Surface Sealants ◽  
Surface Sealant ◽  
Effect Of Surface

Surface sealants are reported to ensure surface smoothness and improve the surface quality of composite restorations. These sealants should also reduce the bacterial adhesion on composite surfaces however, there is not much information regarding their performance on bulk-fill composite materials. The aim of this study was to evaluate the effect of surface sealant application on surface roughness and bacterial adhesion of various restorative materials. Disc-shaped samples were prepared from a compomer, a conventional composite and three bulk-fill composites. Specimens of each group were divided into two groups (n = 9): with/without surface sealant (Biscover LV, [BLV]). Surface roughness values were examined by profilometry and two samples of each group were examined for bacterial adhesion on a confocal laser scanning microscope (CLSM). Bacterial counts were calculated by both broth cultivation and microscopic images. Results were analyzed with one-way ANOVA and Bonferroni/Dunn tests. Following the BLV application, there was a decrease in the surface roughness values of all groups however, only Tetric N-Ceram Bulk and Beautifil-Bulk groups showed significantly smoother surfaces (p < 0.001). There were no significant differences among material groups without BLV application. Evaluating bacterial adhesion after BLV application, conventional composite had the lowest values among all followed by the compomer group. Beautifil-Bulk had significantly the highest bacterial adhesion (p < 0.05), followed by Tetric N-Ceram Bulk group. Without BLV application, there was no significant difference among bacterial adhesion values of groups (p > 0.05). CLSM images showed cell viability in groups. Bulk-fill composites showed higher bacterial adhesion than conventional composite and compomer materials. The surface sealant was found to be highly effective in lowering bacterial adhesion, but not so superior in smoothing the surfaces of restorative materials. So, surface sealants could be used on the restorations of patients with high caries risk.

scholarly journals Assessing the Functional Properties of TiZr Nanotubular Structures for Biomedical Applications, through Nano-Scratch Tests and Adhesion Force Maps

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 900
Author(s):  
Maria Vardaki ◽  
Aida Pantazi ◽  
Ioana Demetrescu ◽  
Marius Enachescu
Keyword(s):  
Surface Roughness ◽  
Functional Properties ◽  
Bacterial Adhesion ◽  
Biomedical Applications ◽  
Adhesion Force ◽  
Roughness Parameters ◽  
Force Microscopy ◽  
Atomic Force ◽  
The Mean ◽  
Scratch Tests

In this work we present the results of a functional properties assessment via Atomic Force Microscopy (AFM)-based surface morphology, surface roughness, nano-scratch tests and adhesion force maps of TiZr-based nanotubular structures. The nanostructures have been electrochemically prepared in a glycerin + 15 vol.% H2O + 0.2 M NH4F electrolyte. The AFM topography images confirmed the successful preparation of the nanotubular coatings. The Root Mean Square (RMS) and average (Ra) roughness parameters increased after anodizing, while the mean adhesion force value decreased. The prepared nanocoatings exhibited a smaller mean scratch hardness value compared to the un-coated TiZr. However, the mean hardness (H) values of the coatings highlight their potential in having reliable mechanical resistances, which along with the significant increase of the surface roughness parameters, which could help in improving the osseointegration, and also with the important decrease of the mean adhesion force, which could lead to a reduction in bacterial adhesion, are providing the nanostructures with a great potential to be used as a better alternative for Ti implants in dentistry.

scholarly journals Effect of various polishing burs on surface roughness and bacterial adhesion in pediatric zirconia crowns

2019 ◽  
Vol 38 (2) ◽  
pp. 311-316 ◽  
Author(s):  
Hanho GO ◽  
Howon PARK ◽  
Juhyun LEE ◽  
Hyunwoo SEO ◽  
Siyoung LEE
Keyword(s):  
Surface Roughness ◽  
Bacterial Adhesion ◽  
Zirconia Crowns

Effect of Ni and Zn Elements on the Microstructure and Antibacterial Properties of Cu Coatings

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Khaled S. Al-Athel ◽  
Najat Marraiki ◽  
Abul Fazal M. Arif ◽  
Syed Sohail Akhtar ◽  
Javad Mostaghimi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Bacterial Adhesion ◽  
316L Stainless Steel ◽  
Coating Layer ◽  
Antibacterial Properties ◽  
Lower Surface ◽  
Distilled Water ◽  
Gram Positive ◽  
Gram Negative ◽  
E Coli

In this work, 316L stainless steel samples were coated with copper (Cu) and German silver (Cu 17%Ni 10%Zn) to investigate the relation between their mechanical and antibacterial behaviors. The mechanical and material characteristics of the samples were studied by looking into the microstructure of the surface and the cross-section of the coatings, the surface roughness, and the adhesion strength between the coating layer and the substrate. The antibacterial behavior is then studied against gram-negative Escherichia coli and gram-positive Staphylococcus aureus. Two experiments were conducted to examine the antibacterial behavior. In the first experiment, the coated samples were covered with distilled water, whereas in the second experiment, the samples were tested without being covered with distilled water. The results show that German silver (Cu 17%Ni 10%Zn) had a higher antibacterial rate than copper (Cu) by around 10% for both gram-negative E. coli and gram-positive S. aureus. The reason is because a smoother surface is expected to limit the bacterial adhesion in most cases, and the German silver samples have a lower surface roughness (Ra) due to the higher thermal expansion value of zinc (Zn) compared with copper (Cu). A more in-depth look into the effect of various thickness of the coating with alloying elements (in this case nickel and zinc) on the antibacterial rate would be of great interest.

scholarly journals Micromachining of Transparent Biocompatible Polymers Applied in Medicine Using Bursts of Femtosecond Laser Pulses

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1093
Author(s):  
Evaldas Kažukauskas ◽  
Simas Butkus ◽  
Piotr Tokarski ◽  
Vytautas Jukna ◽  
Martynas Barkauskas ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Femtosecond Laser ◽  
Contact Lenses ◽  
Laser Pulses ◽  
Laser Micromachining ◽  
Femtosecond Laser Pulses ◽  
Intraocular Lenses ◽  
Great Promise ◽  
Biocompatible Polymers ◽  
Mechanical Methods

Biocompatible polymers are used for many different purposes (catheters, artificial heart components, dentistry products, etc.). An important field for biocompatible polymers is the production of vision implants known as intraocular lenses or custom-shape contact lenses. Typically, curved surfaces are manufactured by mechanical means such as milling, turning or lathe cutting. The 2.5 D objects/surfaces can also be manufactured by means of laser micromachining; however, due to the nature of light–matter interaction, it is difficult to produce a surface finish with surface roughness values lower than ~1 µm Ra. Therefore, laser micromachining alone can’t produce the final parts with optical-grade quality. Laser machined surfaces may be polished via mechanical methods; however, the process may take up to several days, which makes the production of implants economically challenging. The aim of this study is the investigation of the polishing capabilities of rough (~1 µm Ra) hydrophilic acrylic surfaces using bursts of femtosecond laser pulses. By changing different laser parameters, it was possible to find a regime where the surface roughness can be minimized to 18 nm Ra, while the polishing of the entire part takes a matter of seconds. The produced surface demonstrates a transparent appearance and the process shows great promise towards commercial fabrication of low surface roughness custom-shape optics.

Modulation of Bacterial Adhesion to Hydrogel Contact Lenses by Albumin

1998 ◽  
Vol 75 (1) ◽  
pp. 23-29 ◽  
Author(s):  
REBECCA L. TAYLOR ◽  
MARK D.P. WILLCOX ◽  
TIMOTHY J. WILLIAMS ◽  
JOANNA VERRAN
Keyword(s):  
Bacterial Adhesion ◽  
Contact Lenses

Vibrational spectroscopic study of disposable soft contact lenses. Correlations with the bacterial adhesion on their surface

1994 ◽  
Vol 5 (11) ◽  
pp. 834-837 ◽  
Author(s):  
A. Bertoluzza ◽  
P. Monti ◽  
R. Simoni ◽  
C. R. Arciola ◽  
A. Pizzoferrato ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Bacterial Adhesion ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses

Bacterial Adhesion on Polyelectrolyte Modified Microstructured Titanium Surfaces

2010 ◽  
Vol 1277 ◽  
Author(s):  
Argelia Almaguer-Flores ◽  
Yolloxóchilt R. Sánchez-Cruz ◽  
Jung Hwa Park ◽  
René Olivares-Navarrete ◽  
Michel Dard ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Bacterial Adhesion ◽  
Statistical Significance ◽  
Fusobacterium Nucleatum ◽  
Bacterial Attachment ◽  
Chemical Surface ◽  
Campylobacter Rectus ◽  
Submicron Scale ◽  
Student’S T

Micron-scale and submicron-scale surface roughness enhance osteoblast differentiation on titanium (Ti) substrates and increases bone-to-implant contact in vivo. However, bacterial adhesion is also strongly influenced by roughness and surface chemistry. The aim of this study was to investigate if chemical surface modifications alter initial bacterial attachment. To achieve this, two polyelectrolyte layers [chitosan (Ch) and poly(L-lysine) (PLL)] were used to coat Ti surfaces with different roughness (PT [Ra<0.3μm], SLA [Ra≥3.0μm]). Bacterial attachment was evaluated using Aggregatibacter actinomycetemcomitans, Actinomyces israelii, Campylobacter rectus, Eikenella corrodens, Fusobacterium nucleatum, Parvimonas micra, Porphyromonas gingivalis, Prevotella intermedia and Streptococcus sanguinis. After 24h incubation, bacteria were detached from the samples with sonication and the counting plate technique was performed to determine the number of colony forming units (CFU's). Additionally, surfaces were observed by scanning electron microscopy to determine bacteria surface coverage. Statistical significance was determined using ANOVA followed by Bonferroni's modification of Student's t-test. The results showed that polyelectrolyte coatings did not affect surface roughness. Modified surfaces were more hydrophilic than the controls. PT surfaces covered by Chi exhibited lower CFUs than the same surface covered by PLL or the control PT (140 × 105/mL, 343 × 105/mL and 283 × 105/mL, respectively). The opposite effect was observed on the SLA surfaces, PLL coated samples shown lower CFUʼs than Chi or uncoated SLA (199 × 105/mL, 229 × 105/mL and 227 × 105/mL, respectively). The Chi layer appeared to reduce bacterial adhesion only on the smooth surfaces. In contrast, PLL coatings reduced bacterial attachment on rougher surfaces. These results suggest that chemical modification of Ti without alteration of surface roughness affects oral bacterial attachment, and could be useful to prevent peri-implantitis related diseases.

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