Joana Mesquita-Guimarães

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Verified

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• PhD
• Researcher at University of Aveiro

Bioactive zirconia dental implant surface functionalisation via laser technology: mineralisation behaviour and cells morphology analysis

The energetic worldwide emergency demands a significant drop in fossil energy to renewable energies as part of the sustainable solutions for global energy consumption. MAX phase materials, such as Cr2AlC, are potential candidates for heat exchanger applications due to their excellent oxidation and corrosion resistance, good thermal shock response a...

Double-depth texturization and bioactive coatings via laser technology for zirconia dental implants

Additive manufacturing appears to facilitate the accurate manufacturing of alumina-zirconia technical ceramics. Nevertheless, the fine tuning of the manufacturing of these components by 3D printing requires an analysis of the parameters that influence their final thermoelastic properties. In this context, this work presents the application of (fini...

The current need to develop Additive Manufacturing (AM) processes capable of producing defect-free, fully-dense functional ceramics could benefit from the knowledge consolidated throughout the years in conventional processing. This review provides an up-to-date status of AM fabrication of dense alumina, zirconia and their composites, in comparison...

A caracterização dos materiais para aplicação biomédica requerem técnicas de análise de precisão para garantir a exigência associada a esta área médica. Neste capítulo serão apresentadas as técnicas de análise química mais comumente utilizadas em estudos científicos na área da Implantologia. Estas técnicas são as mesmas que são utilizadas em pesqui...

The objective of this study was to develop a replica method for producing zirconia-reinforced bioactive glass (ZRBG) porous structures for bone repair. Four different types of porous structures were produced: zirconia (G1), 58S BG-coated zirconia (G2), zirconia-reinforced BG (G3) and 58S BG-coated zirconia-reinforced BG (G4). A complete characteriz...

The main aim of this study was to assess the effect of ns-Nd:YAG laser structuring over zirconia green compacts on the adhesion of sintered zirconia to resin-matrix cements. Zirconia (3Y-TZP) compacts were divided according to the type of surface modification: GB-alumina grit-blasted sintered specimens; G8L-laser structured zirconia green compacts...

Bone defects resulting from infections, tumors, or traumas represent a major-health care problem. There is a critical maximum size defect in which bone tissue can self-repair, so tissue engineering is often working in conjunction with medicine to develop techniques to repair bone damage and increase patient's life quality. In that context, scaffold...

The main aim of this study was to assess the effect of ns-Nd:YAG laser structuring over zirconia green compacts on the adhesion of sintered zirconia to resin-matrix cements. Zirconia (3Y-TZP) compacts were divided according to the type of surface modification: GB – alumina grit-blasted sintered specimens; G8L – laser structured zirconia green compa...

The present study aims at developing a computational framework with experimental validation to determine the mechanical properties of zirconia foams for bone tissue engineering. A micro-CT based finite element model that allows characterizing the mechanical property of such cellular structures is developed. Micro-CT images are filtered to vanish no...

Laser texturing is a technique that has been increasingly explored for the surface modification of several materials on different applications. Laser texturing can be combined with conventional coating techniques to functionalize surfaces with bioactive properties, stimulating cell differentiation and adhesion. This study focuses on the cell adhesi...

A new family of bioceramic scaffolds consisting of zirconia foam-like structures with 58S bioactive glass (BG) coating was developed. Three open-cell structures fabricated by the foam replica method were coated via immersion in a sol-gel solution. The coating technique was optimised controlling the sol viscosity, condensation time, and the number o...

Considering that oyster shells are mostly made of calcium carbonate, their reintroduction in the industry becomes easier, thus it can be used in several sectors such as building materials, food supplement, pharmaceutical industry, animal feed, ground correction among others. Besides that, in marine culture, especially oyster culture, in 2014, appro...

The aim of this study was to manufacture zirconia periodic open cellular structures (POCS) (39%–57% porosity) and evaluate their mechanical properties. Zirconia POCS with 39%, 47% and 57% porosity were obtained from a CAD/CAM blank using a CNC milling machine. Specimens with a feldspar-based porcelain infiltrated in the porosities were also produce...

The development of dental restorative materials that mimic tooth-like properties provided by graded structures, aesthetics and properties such as strength, damping capacity and the ability for a continuous remodeling according to the biomechanical solicitation is a great challenge. In this work, damping capacity and dynamic Young's modulus of Y-TZP...

The aim of this study was to produce zirconia structures with a porous surface by the dip coating technique and assess the mechanical properties of the structures as well as the integrity of the porous layers. Surface porous layers with homogenous and graded porosity were produced over zirconia substrate discs using zirconia powders with different...

Objectives: The aim of this study was to evaluate the use of dual-cure resin cement to promote the bonding between a veneering PEEK and zirconia or titanium surfaces. Materials and methods: The surface of titanium and sintered zirconia disks were gritblasted, ultra-sonically cleaned in distilled water, and dryed by oil-free air. Then, a adhesive sy...

Zirconia implants are becoming a preference choice for different applications such as knee, dental, among others. In order to improve osseointegration, implant's surfaces are usually coated with bioactive materials like hydroxyapatite (HAp) and beta-tricalcium phosphate (β-TCP) that are very similar to the calcium phosphates found in bones. However...

A new family of bioceramic scaffolds consisting of zirconia foam-like structures with 58S bioactive glass (BG) coating was developed. Three open-cell structures fabricated by the foam replica method were coated via immersion in a sol-gel solution. The coating technique was optimised controlling the sol viscosity, condensation time, and the number o...

Calcium carbonate is one of the most used raw materials in various industries, such as construction materials, food supplement, pharmaceutics, animal feed, plastic production, and others. Calcium carbonate can derive from marine wastes, like crustaceans and bivalve’s shells. The worldwide demand for new sources of food has increased exponentially,...

Different zirconia porous layers were produced on zirconia dense zirconia substrates by slip casting using powder with different mean sizes: 40 μm (Z40), 70 μm (Z70), and 100 μm (Z100). The dynamic and static coefficients of friction against bovine femoral bone, mimicking the implantation process, were conducted using a ball‐on‐flat reciprocating s...

Laser structuring Dual-cure resin cement Shear bond strength A B S T R A C T Objectives: The aim of this study was to evaluate the influence of a surface conditioning technique using laser ablation and acid etching on PEEK substrate on its bonding strength to a resin cement. Materials and methods: Cylindrical specimens of unfilled PEEK, 30% glass f...

The aim of this paper was to evaluate the tribological performance of bioactive zirconia composite layers applied by press and sinter method on yttria-stabilized zirconia (YSZ) substrates. Two types of bioactive zirconia composite layers were tested, zirconia reinforced by 10 vol% of HAp and by 10 vol% of β-TCP. The wear tests were carried out in P...

The aim of this study was to evaluate the influence of a surface conditioning technique using laser ablation and acid etching on PEEK substrate on its bonding strength to a resin cement. Cylindrical specimens of unfilled PEEK, 30% glass fibre reinforced PEEK, and 30% carbon fibre reinforced PEEK were separated in four groups according to the follow...

Zirconia structures with controlled surface porosity may be used in several biomedical and engineering applications. This work aimed at developing a processing route for the production of zirconia structures with porous surfaces, using the dip coating method and without pore forming additives. Zirconia powders (~40μm diameter) were used in the dip...

Objectives The aim of this study was to evaluate the effect of laser surface structuring on the bond strength of feldspar-based porcelain to zirconia, as compared to conventional sandblasting treatment. Materials and methods Thirty cylindrical zirconia substrates, previously sintered, were divided in three groups according to the type of surface c...

In this chapter the importance of bioactive glasses used as coating for bone formation is pointed out. The discovery of bioactive glass was the starting point for the development of bioactive materials in the field of biomaterials research, proposing several other bioactive glass composites and developing several technologies. The use of bioactive...

This work intends to develop a zirconia-based implant (maintain the mechanical properties), covered with an composite outer layer of zirconia and 10 % vol. of a bioactive material (avoids the delamination and stimulates osseointegration) by press and sintering process.

Bioactive glass is an attractive biomaterial that has shown excellent osteogenic and angiogenic effects for oral bone repairing procedures. However, anti-biofilm potential related to such biomaterial has not been completely validated, mainly against multispecies biofilms involved in early tissue infections. The aim of the present study was to evalu...

Layered ceramic systems are usually hit by residual thermal stresses created during cooling from high processing temperature. The purpose of this study was to determine the thermal residual stresses at different ceramic multi-layered systems and evaluate their influence on the bending stress distribution. Finite elements method was used to evaluate...

Residual thermal stresses are formed in dental restorations during cooling from high temperature processing. The aim of this study was to evaluate the influence of constructive design variables (composition and interlayer thickness) on residual stresses in alumina- and zirconia-graded restorations. Restorations' real-like cooling conditions were si...

On the cover: Schematic diagram showing mesoporous bioactive glass loaded with antibacterial agents applied and delivered at infected implanted receptor sites with an acid medium to inhibit biofilm proliferation and repair bone defects.

In this work, TiO2 ceramic scaffolds were fabricated by the replica method using polyurethane (PU) sponges. Suspensions with high solid content were used to achieve scaffolds with improved mechanical behavior. TiO2 ceramic suspensions were optimized by rheological studies using different additives. It was found that the composition with 0.5 wt% Dar...

Bioactive glasses (BGs) are promising materials for bone repair due to their desirable properties such as osteoconductivity, biodegradability, angiogenic potential, and antibacterial activity. Ionic dissolution products from bioactive glasses increase the medium pH reducing surrounding bacteria proliferation. The activity of BGs against biofilm for...

Background: Dimensional changes occur in the alveolar ridge after tooth loss due to bone resorption. Bioactive ceramic scaffolds have been developed for bone alveolar augmentation demonstrating desirable properties such as biocompatibility and osteocon-ductivity; however, their mechanical properties are still an issue during implantation.

Human bones possess the capability of regenerating small injuries, but when defects in the bone matrix are bigger than 3 cm caused by fractures or cancer, a complete preservation of the bone by self-regeneration is not possible. In such cases, the employment of an implant is necessary. A bone implant must be not only biocompatible as also biologica...

The purpose of this study was to evaluate the biaxial flexural stresses in classic bilayered and in graded zirconia-feldspathic porcelain composites. A finite element method and an analytical model were used to simulate the piston-on-ring test and to predict the biaxial stress distributions across the thickness of the bilayer and graded zirconia-fe...

One of the most used material in prosthetic dentistry field is the Yttria-stabilized Zirconia, due to its properties such as biocompatibility, high mechanical resistance, abrasion and oxidation resistance and high hardness. When the crowns are machined, there is a waste of about 35-45% of the material, that can be powder resultant from the machinin...

Tetragonal zirconia polycrystal is a widely used material in dentistry due to its toughening mechanism as well for its esthetic aspect, chemical stability and biocompatibility. This toughening mechanism is achieved by the use of stabilizers such as Y2O3, CeO2, MgO and CaO. 3%molar Y2O3-ZrO2 is extensively used for dental application although it may...

The aim of this work is to manufacture scaffolds with a well-interconnected pore network through the replication method with appropriate mechanical strength for biological applications by using high solid content (above 65wt%) ceramic slurries from commercial TiO2 powders. Titanium oxide has been studied for its great bioactive potential, selected...

Functionally Graded Material is a smart configuration of a designed material to improve its capability for certain application. The main characteristic of a Functionally Graded Material (FGM) is the composition and structure gradually changes over volume, resulting in corresponding changes in the properties of the material. This solution have been...

Plasma sprayed mullite/YSZ graded coatings on SiC substrates were examined as environmental barrier coatings (EBCs). Several coating systems with various layer arrangements were subjected to thermal aging at 1300 °C in cycling (50 and 100 cycles, i.e. 100 and 200 h) conditions under rich water vapor atmosphere. The level of porosity and the crack p...

Procedimiento de obtención de material cerámico de aporte para técnicas de proyección térmica. Procedimiento para la obtención de un material cerámico granulado adecuado para ser utilizado como material de aporte en las diferentes técnicas de recubrimiento por proyección térmica. De manera más específica, la presente invención se refiere a un proce...

Yttria-stabilized zirconia (YSZ)-mullite multilayer architectures with compositional grading between the bond coat and YSZ top coat are envisioned as solutions to ease their coefficient of thermal expansion mismatch induced stress. In this work, two different types of mullite powder (spray-dried and freeze-granulated) and a mullite-YSZ 75/25vol.% m...

Compositionally graded mullite/ZrO2 coatings, have been tested as environmental barrier coatings (EBCs) for protection against water vapor corrosion of Si-based ceramic components intended for application in turbine engines. Four and five layered systems were engineered by plasma spraying over SiC substrates consisting of a Si bond coat layer, 2 or...

Feedstock powders employed in thermal spraying applications must fulfill certain conditions in terms of particle size, morphology and homogeneity for a continuous and reliable spraying. In this work, two powder processing routes, Spray Drying (SD) and Freeze Granulation (FG), were implemented for single mullite and the equal by volume mullite/YSZ m...

Mullite-based systems have been considered as environmental barrier coatings (EBCs) for high temperature protection of Si-based ceramic (Si3N4, SiC) substrates against water vapor corrosion, for application in forthcoming turbine engines. Graded mullite/Y-ZrO2 composites plasma sprayed over Hexoloy SiC substrates were analyzed as EBCs. All feedstoc...

Mullite and mullite/ZrO2-7wt.%Y2O3 coatings could be thought among the main protective layers for environment barrier coatings (EBCs) to protect Si-based substrates in future gas turbine engines. Considering that feedstock of the compound powder is not commercially available, two powder processing routes Spray Drying (SD) and Flame Spheroidization...

Mullite and mullite/Y-ZrO2 (25 and 50vol.%) beads were produced by thermal spraying in water the corresponding atomised compositions. The amount of amorphous phases in the as-sprayed beads was comparatively determined by X-ray diffraction (XRD) and differential thermal analysis (DTA) methods. Characteristic XRD peaks associated to crystallization o...

Mullite-based multilayered structures have been suggested as promising environmental barrier coatings for Si3N4 and SiC ceramics. Mullite has been used as bottom layer because its thermal expansion coefficient closely matches those of the Si-based substrates, whereas Y–ZrO2 has been tried as top layer due to its stability in combustion environments...

Mullite (Al6Si2O13) is the basis of efficient environmental barrier coatings (EBCs) for protecting Si-based ceramic matrix composites (CMCs) selected to replace specific hot-section metallic components in advanced gas turbines. Furthermore, YSZ-mullite multilayer architectures with compositional grading between the bond coat and YSZ top coat were e...

Mullite and mullite/ZrO2 bi-layer systems are being considered as environment barrier coatings (EBCs) for protection of Si-based (Si3N4, SiC) substrates against water vapor corrosion for application in forthcoming turbine engines. An approach to reduce the thermal expansion mismatch between mullite and ZrO2 layers in those coatings would be to tail...

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Mullite coatings are being considered as one of the main protective layers of environment barrier coatings (EBCs) to be used to protect Si-based substrates for the next generation of gas turbine engines. In this study, the influence of the powder morphology and processing conditions on the microstructure (SEM), relative crystallinity (XRD) and mech...

In this study, two processing routes are used to produce mullite powders for thermal spraying and the influence of each method on particle morphology and microstructure is investigated. Different thermal treatments are performed to improve grain cohesion and powder flow and their effect on the crystal structure of the powder is assessed as well. Th...

This study investigates the influence of powder morphology and spray processes on the microstructure, crystallinity, hardness, and elastic modulus of mullite coatings. Coatings produced from mullite powders and suspensions are deposited by plasma spraying while measuring in-flight particle temperature and velocity. Powder morphology and spraying co...