Fly ash-based geopolymers represent a new material, which can be considered an alternative to ordinary Portland cement. MiniBars™ are basalt fiber composites, and they were used reinforce the geopolymer matrix for creation of unidirectional reinforced composites (MiniBars™ FRBCs). New materials obtained by incorporating variable amount (0, 12.5, 25, 50, 75 vol.% MiniBars™) in matrix. Geopolymers prepared mixing fly ash powder with Na2SiO3 NaOH as alkaline activators. FRBCs cured at 70 °C 48...

The novelty of this study consists in the formulation and characterization three experimental dental composites (PM, P14M, P2S) for cervical lesion restoration compared to commercial Enamel plus HRi® - En (Micerium S.p.A, Avengo, Ge, Italy), G-ænial Anterior® (GC Europe N.V., Leuven, Belgium), Charisma® Ch (Heraeus Kulzer, Berkshire, UK). physio-chemical properties were studied, like degree conversion residual monomers cured samples using FTIR-ATR (attenuated total reflectance) HPLC-UV...

The present study is focused on polylactic acid (PLA) blending with bio nanoadditives, such as Tonsil® (clay) and Aerosil®, to obtain nanocomposites for a new generation of food packaging. basic composition was enhanced using Sorbitan oleate (E494) Proviplast plasticizers, increasing the composite samples’ stability their mechanical strength. Four mixtures were prepared: S1 Tonsil®; S2 Aerosil®; S3 Aerosil® + Proviplast; S4 Sabosorb. They complexly characterized by FT-IR spectroscopy,...

Composites based on polylactic acid (PLA) and copper for food packaging applications were obtained. Copper clusters synthesized in polyethylene glycols 400 600, respectively, using ascorbic as a reducing agent, by reactive milling. characterized Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FT-IR), Ultraviolet-Visible (UV-VIS) spectroscopy. Copper/PLA composites containing Proviplast plasticizer FT-IR spectroscopy, mechanical tests, Differential Calorimetry (DSC),...

Various powders of graphene oxide (GO), GO with silver (GO-Ag) and zinc (GO-ZnO) were obtained. The silanized (3-aminopropyl) triethoxysilane (APTES) aiming to be used, in a future stage, as additives the hydraulic lime mortars composition. characterized by Fourier Transform Infrared Spectrometry (FTIR) Scanning Electron Microscopy (SEM) before after silanization process. GO, GO-Ag, GO-Ag-APTES, GO-ZnO GO-ZnO-APTES also investigated Thermogravimetric Analysis (TG/DTA) Ultraviolet–Visible...

Functionalized graphene and hydroxyapatite fillers are proposed as reinforcing particles in light-cured adhesives for dental applications. Silica-silver-graphene (SiO2-Ag-Gr), silver-doped (HA-Ag), silver doped (HA-Ag-Gr), regular silica (SiO2) inorganic powders, together with bis-GMA (2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy) oligomers, main components of the organic matrix, were synthesized. Light field transmission electron microscopy diffraction proved successful synthesis powders. The...

Vehicle traffic pollution requires complex physicochemical analysis besides emission level measuring. The current study is focused on two campaigns of emissions measurements held in May and September 2019 Alba Iulia City, Romania. There was found a significant excess PM2.5 for all measuring points PM10 the most circulated during May, along with VOC CO2 emissions. reveal threshold PM increased values These are consequences environmental interaction traffic. Street dust air-suspended particle...

Agricultural waste from the fruit and vegetable industry is used as an alternative source of animal feed, but detailed investigations are required. The aim this work was to conduct a physico-chemical characterization, through analytical techniques, wastes such those golden apples, red carrots, celery, beetroots, potato peels. bioactive compounds in samples indicated high carbohydrate content 50.38 g/100 g apples 59.38 mg/100 organic acids celery. In addition, total phenolic (TPC, mg gallic...

The aim of the present work was to prepare a series novel restorative giomers and investigate morphology, physico-chemical properties (residual monomer, fluoride release), cytotoxicity new materials. experimental were prepared as light-cured pastes by blending different resin matrices comprising aromatic/aliphatic/urethane (di) methacrylates, with hybrid fillers containing pre-reacted glasses (PRGs), radiopaque glass, nano fluorhydroxyapatite. Polyalkenoic acids based on acrylic...

Among the newest trends in dental composites is use of graphene oxide (GO) nanoparticles to assure better cohesion composite and superior properties. Our research used GO enhance several hydroxyapatite (HA) nanofiller distribution three experimental CC, GS, GZ exposed coffee red wine staining environments. The presence silane A-174 on filler surface was evidenced by FT-IR spectroscopy. Experimental were characterized through color stability after 30 days coffee, sorption solubility distilled...

Considering recent climate changes, special importance is given to any attempt depollute and protect the environment. A circular economy seems be ideal solution for valorization of mineral waste, resulting from various industrial branches, by reintroducing them in process obtaining alternative building materials, more friendly Geopolymers can considered as a promising option compared Portland cement. Information about influence composition precursors, activation system on mechanical...

(1) Background: Poor hygiene and denture presence in the oral cavity are factors that favor bacterial accumulation, cause of halitosis various general diseases. Aim: This study aimed to evaluate possibility inactivating bacteria associated with acrylic wearers using polymethyl methacrylate resin enhanced graphene silver nanoparticles effect association extra photodynamic therapy. (2) Methods: Graphene 1 2 wt% were added a commercial powder. Three groups containing samples from three...

Poor oral hygiene leads to serious damages of theteeth’s surface enamel such as micro-abrasions and acid erosion. These alterations combined with bacterial plaque result in cavity appearance. Prophylactic measures include various techniques for restoration. Fluorination is one the most important treatments this purpose. Therefore, present research, we investigated classical fluorination treatment compared laser photodynamic performed on human samples poor quality. Three sample groups were...

Abstract This study focuses on the development of bioactive packaging materials by incorporating grape pomace and copper particles into polylactic acid (PLA) composites. The goal is to increase shelf life packaged foods while benefiting health consumers through use these active materials. 6 recipes composite based Proviplast 2624 plasticizer were obtained. additives added were: pomace, at 0.5%, 1% 1.5%, particles, formed using PEG 600 + CuSO₄, 2%, 5% 8%. Material characterization techniques:...

The aim of this study was to develop an experimental self-etch dental adhesive (SE) by synthesizing graphene oxide–functionalized zirconia (GO-ZrO2) and hydroxyapatite–functionalized zinc (HA-Zn) as inorganic powders together with bis-GMA (0–2) (bisphenol A-glycidyl methacrylate) oligomers main components the organic matrix. compared current gold standard Clearfill SE Bond 2 (CSE) using cytotoxicity assays, shear bond strength (SBS) tests, resin–dentin interface analyses. Cytotoxicity assays...

The novelty of this study consists on the formulation and evaluation five complex experimental natural photosensitizers (PS): gel with oregano essential oil (O), methylene blue (AM), a mixture oils (Thieves-H), arnica curcuma extract (CU) frankincense (T), used as photosensitizing agents (PS) in antimicrobial photodynamic therapy (aPDT) control microbial biofilm oral cavity. PS were characterized by gas chromatography-mass spectrometry (GC-MS), Fourier-transform infrared spectroscopy (FTIR),...

The preservation of oral health over a person's lifespan is key factor for high quality life. Sustaining requires high-end dental materials with plethora attributes such as durability, non-toxicity and ease application. combination different requirements leads to increasing miniaturization complexity the material components composite adhesives, which makes precise characterization blend challenging. Here, we demonstrate how modern IR spectroscopy imaging from micro- nanoscale can provide...

Dental 3D-printing technologies, including stereolithography (SLA), polyjet (triple-jetting technology), and fusion deposition modeling, have revolutionized the field of orthodontic occlusal splint manufacturing. Three-dimensional printing is now currently used in many dental fields, such as restorative dentistry, prosthodontics, implantology, orthodontics. This study aimed to assess mechanical properties 3D-printed materials compare them with conventional polymethylmethacrylate (PMMA)....

Brackets are metallic dental devices that very often associated with acidic soft drinks such as cola and energy drinks. Acid erosion may affect the bonding between brackets enamel surface. The purpose of this study was to investigate characteristics brackets' adhesion, in presence two different commercially available Sixty human teeth were divided into six groups bonded either resin-modified glass ionomer (RMGIC) or resin composite (CR). A shared bond test (SBS) evaluated by comparing...

The study evaluated the impact of graphene powders used as additives in recipe experimental lime mortar to a mixture ratio 1:2.5 NHL3.5 hydraulic lime:fine sand. content binder, aggregate and water was kept constant, varying only amount type added relation natural NHL3.5. following five types mortars were prepared follows: reference (without additive); containing 1 wt.% GO 5 powder; with mixture: powder functionalized silver nanoparticles fly ash (GO-Ag + GO-fly ash); zinc oxide titanium...

This study aims to assess the biocompatibility of new advanced fiber-reinforced composites (FRC) be used for custom-made cranial implants. Four formulations FRC were obtained using polymeric matrices (combinations monomers bisphenol A glycidylmethacrylate [bis-GMA], urethane dimethacrylate [UDMA], triethylene glycol [TEGDMA], hydroxyethyl methacrylate [HEMA]) and E-glass fibers (300 g/mp). Every contains 65% 35% matrix. Composition are: bis-GMA (21%), TEGDMA (14%) FRC1; HEMA FRC2; (3.5%),...

The novelty of this study consists the formulation and characterization three experimental bleaching gels with hydroxylapatite oxides fluorine (G28®, G29®, G30®) based on natural fruit extracts compared to commercial Opalescence 15% (GC, Ultradent, South Jordan, UT, USA). Studies have been conducted effect that color morphology different restorative materials (Nanofill®-Schulzer, P.L. Superior Dental Materials GmbH, Hamburg, Germany, nanocomposites (P11®, P31®, P61®)), immersed in coffee...