Search results for " filler"

In Vitro Biocompatibility Evaluation of Nine Dermal Fillers on L929 Cell Line

2020

Objective. Biomaterial research for soft tissue augmentation is an increasing topic in aesthetic medicine. Hyaluronic acid (HA) fillers are widely used for their low invasiveness and easy application to correct aesthetic defects or traumatic injuries. Some complications as acute or chronic inflammation can occur in patients following the injection. Biocompatibility assays are required for medical devices intended for human use, in order to prevent damages or injuries in the host. In this study, nine HA fillers were tested in order to evaluate their cytotoxicity and their effects on L929 cell line, according to the UNI EN ISO 10993 regulation. Methods. Extracts were prepared from nine HA fil…

An 18-Month Follow-up, Randomized Comparison of Effectiveness and Safety of Two Hyaluronic Acid Fillers for Treatment of Moderate Nasolabial Folds

2016

Hyaluronic acid (HA) filler injection is a popular nonsurgical aesthetic procedure.To compare the effectiveness and safety of 2 hyaluronic acid fillers (HAEC and HARES) for treatment of moderate nasolabial folds (NLFs).This was an evaluator- and subject-blinded split-face study. HAEC or HARES was randomly assigned to the left or right NLF at baseline. Retreatment was performed after 9 months; follow-up extended to 18 months after baseline (9 months after retreatment). Effectiveness assessments included the Wrinkle Severity Rating Scale (WSRS) and subject preference. Safety assessments included adverse events (AEs) and local tolerability symptoms recorded by subjects during 3 weeks after tre…

Effect of TiO2 and Al2O3 Addition on the Performance of Chitosan/Phosphotungstic Composite Membranes for Direct Methanol Fuel Cells

2023

Composite chitosan/phosphotungstic acid (CS/PTA) with the addition of TiO2 and Al2O3 particles were synthesized to be used as proton exchange membranes in direct methanol fuel cells (DMFCs). The influence of fillers was assessed through X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, liquid uptake, ion exchange capacity and methanol permeability measurements. The addition of TiO2 particles into proton exchange membranes led to an increase in crystallinity and a decrease in liquid uptake and methanol permeability with respect to pristine CS/PTA membranes, whilst the effect of the introduction of Al2O3 particles on the characteristics of membranes is almost the op…

Natural Compounds as Sustainable Additives for Biopolymers

2020

In the last few decades, the interest towards natural compounds, coming from a natural source and biodegradable, for biopolymers is always increasing because of a public request for the formulation of safe, eco-friendly, and sustainable materials. The main classes of natural compounds for biopolymers are: (i) naturally occurring fillers (nFil), such as nano-/micro- sized layered alumino-silicate: halloysite, bentonite, montmorillonite, hydroxyapatite, calcium carbonate, etc.; (ii) naturally occurring fibers (nFib), such as wood and vegetable fibers; (iii) naturally occurring antioxidant molecules (nAO), such as phenols, polyphenols, vitamins, and carotenoids. However, in this short review, …

Medicīna (Latvijas Universitātes Raksti; 812 sēj.)  

2016

Valorisation of industrial iron oxide waste to produce magnetic barium hexaferrite

2016

Barium M-type hexagonal ferrite (BaM, BaFe12O19) is an immensely important magnetic material, which we have successfully made from the simple valorisation of Fe-rich industrial waste from steel wire drawing, with addition of BaCO3 and heating in air to 1000 degrees C. The optimum ratio of Fe. Ba (producing 86 wt% BaM) was found to be 11: 1 (non-stoichiometric), and secondary phases of alpha-Fe2O3 (non-magnetic) and ZnFe2O4 (poorly antiferromagnetic) were always present. This material consisted of small submicron platelets. A hard magnetic ferrite was produced with Ms=48.6 A m(2) kg(-1) and H-c=211.5 kA m(-1). The highest density was achieved by sintering samples with Fe: Ba ratios of 11: 1 …

Modeling of Melt Flow and Heat Transfer in Stationary Gas Tungsten Arc Welding with Vertical and Tilted Torches

2021

A 3D numerical simulation was conducted to study the transient development of temperature distribution in stationary gas tungsten arc welding with filler wire. Heat transfer to the filler wire and the workpiece was investigated with vertical (90°) and titled (70°) torches. Heat flux, current flux, and gas drag force were calculated from the steady-state simulation of the arc. The temperature in the filler wire was determined at three different time intervals: 0.12 s, 0.24 s, and 0.36 s. The filler wire was assumed not to deform during this short time, and was therefore simulated as solid. The temperature in the workpiece was calculated at the same intervals using heat flux, current flux, ga…

Hialuronskābes filleru izraisītie blakusefekti

2018

Pamatojums: Ādā injicējamie hialuronskābes (HA) filleri ir minimāli invazīva sejas estētiska procedūra. HA ir ilgstošas iedarbības, minimāli imūngēni, un tos var sašķelt ar hialuronidāzi. Tomēr HA filleru injekcijas var izsaukt blakusefektus, sākot no nebūtiskiem līdz pat spēcīgiem. Mērķis: Šī darba mērķis ir noteikt sejas ādā injicējamo hialuronskābes filleru blakusefektu dažādību, biežumu un ilgumu. Materiāli un metodes: Šis šķērsgriezuma pētījums tika veikts izmantojot pacientu aptaujas lapas. Dati tika ievākti laika posmā no 2017.gada 6. novembra līdz 2018.gada 16. februārim klīnikā “Veselība un estētika”. Rezultāti: Kopumā tika analizēti 27 pacienti, kas atbilda kritērijiem, tostarp 26…

Hybrid biocomposites based on polylactic acid and natural fillers from Chamaerops humilis dwarf palm and Posidonia oceanica leaves

2022

AbstractPlatelet-like and fibrous lignocellulosic fillers were achieved from the leaves of Chamaerops humilis (CHL) and Posidonia oceanica (POL) and used as a hybrid reinforcement for a polylactic acid (PLA) matrix at three different loading levels (from 5 to 20%). The materials were fully characterized from a morphological, physicochemical, mechanical, and dynamic-thermomechanical point of view. When compared to their counterpart containing either CHL or POL only, the resulting hybrid biocomposites showed the highest mechanical properties, with strengthening and stiffening effects respectively up to 120% and 50% higher than those expected from the linear combination of the two, and higher …

Cheek Volumization and the Nasolabial Fold.

2018

Sir: We have read the article by Mowlds and Lambros1 with great interest and enthusiasm. The findings of their study show that the nasolabial fold does not improve after cheek injection. By analyzing three-dimensional images of the face before and immediately after cheek injection of high- G′ hyaluronic acid, they demonstrate that the perceived nasolabial fold improvement, reported after cheek injections,2,3 is attributable to overall improvement in facial appearance rather than to actual nasolabial fold improvement. As a consequence, it might be ruled out that the nasolabial fold is a consequence of cheek deflating and it is likely attributable predominantly to change in the corner of the …