scholarly journals The Effect of Two-Stage Acid Treatment on Surface Behavior and Improvement of Bioactivity of Nitinol Alloy

2020 ◽  
Vol 11 (3) ◽  
pp. 10690-10702
Keyword(s):  
Surface Roughness ◽  
Chemical Modification ◽  
Surface Chemistry ◽  
Healing Process ◽  
In Vitro Study ◽  
Surface Chemical ◽  
Two Stage ◽  
Nitinol Alloy ◽  
Surface Chemical Modification

Surface properties, including morphology, submicron morphology, and surface chemistry, are essential factors that affect the quality and manner of biological responses at the site of tissue contact with the implant, affecting the bone healing process. In this in vitro study, morphology and biocompatibility of nitinol (NiTi) memory alloy surfaces mechanically polished and modified with a chemical solution consisting of three types of acid (HCl-HF-H3PO4) and then chemical operations in solution (HNO3 and HCl) with a Volumetric scale of 1:1 and examined at ambient temperature. 75 samples were used for surface chemical modification, biological evaluations, and surface roughness, and also 9 samples as control. Scanning electron microscopy (SEM), atomic force microscopy (AFM), and nitinol alloy (NiTi) surface roughness measurements were performed to analyze the surfaces. Besides, MG-63 cells were cultured on different nitinol alloy levels to evaluate adhesion and cell growth and proliferation. Data were analyzed using t-test and one-way analysis of variance. The results show that the chemical surface modification operation with two-stage acid solution had a higher roughness compared to the unmodified surfaces and the surface chemical modification operation with the acidic solution with an only solution consisting of (HCl-HF-H3PO4). Cell culture evaluations also showed that the two-stage modified nitinol levels showed significant cell adhesion and significant growth and proliferation compared to the tertiary acid-modified and unmodified levels. The surface chemical modification method for nitinol alloy can change the surface chemistry and change the surface morphology and create sub-micron scale roughness. This can increase the connectivity of the implant tissue and reduce the toxic effect of nickel.

scholarly journals Role of glyoxalases in wound healing process: an in vitro study

2021 ◽  
Vol 165 ◽  
pp. 39
Author(s):  
Francesca Lombardi ◽  
Silvano Santini ◽  
Paola Palumbo ◽  
Valeria Cordone ◽  
Virginio Bignotti ◽  
...  
Keyword(s):  
Wound Healing ◽  
Healing Process ◽  
In Vitro Study ◽  
Vitro Study ◽  
Wound Healing Process

scholarly journals SEM Analysis of Enamel Abrasion after Air Polishing Treatment with Erythritol, Glycine and Sodium Bicarbonate

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 549 ◽  
Author(s):  
Bruna Sinjari ◽  
Gianmaria D’Addazio ◽  
Martina Bozzi ◽  
Manlio Santilli ◽  
Tonino Traini ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Sodium Bicarbonate ◽  
Air Flow ◽  
Dental Enamel ◽  
In Vitro Study ◽  
Sem Analysis ◽  
Medical Systems ◽  
Air Polishing ◽  
And Control

The aim of this in vitro study was to evaluate the enamel surface topography after treatment with three air polishing powders: Glycine (A), erythritol (B), and sodium bicarbonate (C) (Air Flow Soft, Plus and Classic powders, EMS Electro Medical Systems S.A., Nyon, Switzerland). Fifteen extracted incisors were randomly divided into three groups of five teeth each, A, B and C, respectively. The teeth were blocked in plaster bases, washed, dried and half-covered with polytetrafluoroethylene strips before treatment. In this way, each half-treated dental element became test and control of itself. Comparative statistical analysis of Rq (geometric average of the deviations occurring in roughness profile) was performed. The scanning electron microscope (SEM) analysis showed different degrees of surface roughness between the groups, decreasing after treatment. In addition, a statistically significant reduction p < 0.05 was present in group C (Rq mean non-treated 108.17 µm, 95% CI: 97.29–124.01 and Rq mean treated 86.78 µm, 95% CI: 80.63–93.70). A decrease in surface roughness post-treatment was not observed in group A and B. Therefore, it may be concluded that the air flow powders tested herein can be used on dental enamel to reduce the surface roughness due to function and the action of dental therapies.

scholarly journals Sputtering yields and surface chemical modification of tin-doped indium oxide in hydrocarbon-based plasma etching

2015 ◽  
Vol 33 (6) ◽  
pp. 060606 ◽  
Author(s):  
Hu Li ◽  
Kazuhiro Karahashi ◽  
Masanaga Fukasawa ◽  
Kazunori Nagahata ◽  
Tetsuya Tatsumi ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Indium Oxide ◽  
Plasma Etching ◽  
Surface Chemical ◽  
Sputtering Yields ◽  
Surface Chemical Modification

scholarly journals The behaviour of composites, glass ionomers and compomers in erosive conditions – in vitro study

2014 ◽  
Vol 60 (5) ◽  
pp. 200-203
Author(s):  
Andreea Borş ◽  
Cristina Molnar-Varlam ◽  
Melinda Székely
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Erosive Wear ◽  
In Vitro Study ◽  
Vitro Study ◽  
Initial Surface ◽  
Dental Filling ◽  
Filling Materials ◽  
Restorative Materials

Abstract Objective: The aim of this in vitro study was to evaluate the influence of erosive conditions on the wear resistance of aesthetic direct restorative materials. Methods: Six dental filling materials were tested: two composites (Filtek Z550 and X-tra fil), two compomers (Dyract Extra and Twinky Star) and two glass ionomers (Ketac Molar and Fuji II LC). Twenty disks (10mm×2mm) of each material were prepared (n=120) and kept in artificial saliva at 37˚C for 24 hours. Specimens were cycled in acidic soft drink (Coca-Cola) 5×/day, for 5’, over 30 days. Initial surface roughness ISR (Ra-μm) and final surface roughness FSR were measured using a profilometer. The wear rate was calculated as difference of final minus the initial roughness (ΔSR=FSR-ISR). For statistical analysis t-test and one-way ANOVA test were used by GraphPad Prism version 5.03 statistical software. The level of significance was set at p<0.05. Results: The erosive wear rates (mean±SD, μm) after exposure to acidic beverage were: 0.30±0.03 (Ketac Molar), 0.28±0.04 (Fuji II LC), 0.27±0.00 (Filtek Z550), 0.23±0.01 (X-tra fil), 0.20±0.00 (Twinky Star) and 0.14±0.01 Dyract Extra, respectively. There were significant differences between the tested materials (p<0.05). Conclusions: Dental filling materials had different behaviour under the same erosive condition, however all investigated aesthetic restorative materials showed surface degradation. These findings suggest that erosive wear resistance of tooth coloured restoratives could influence their longevity in intraoral acidic conditions. Acknowledgements: The study was supported by the Internal Research Grant no. 5/30.01.2013 of the University of Medicine and Pharmacy of Tirgu Mureş.

The facile surface chemical modification of a single glass nanopore and its use in the nonenzymatic detection of uric acid

2015 ◽  
Vol 51 (10) ◽  
pp. 1914-1917 ◽  
Author(s):  
Haili He ◽  
Xiaolong Xu ◽  
Ping Wang ◽  
Lizhen Chen ◽  
Yongdong Jin
Keyword(s):  
Uric Acid ◽  
Chemical Modification ◽  
Chemical Method ◽  
Surface Chemical ◽  
Enzymatic Detection ◽  
Surface Chemical Modification

A single glass nanopore was modified with gold through a facile chemical method and used for the non-enzymatic detection of uric acid.

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