Design of Multifunctional Ionic Liquids for Surface Modification of Dental Implants

Design of Multifunctional Ionic Liquids for Surface Modification of Dental Implants
Author: Izabelle de Mello Gindri
Publisher:
Total Pages: 448
Release: 2016
Genre: Anti-infective agents
ISBN:

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This work presents the design and development of a novel multi-functional coating, ionic liquid-based, for surface improvement of dental implants. Dicationic imidazolium-based ionic liquids (ILs) were rationalized, synthesized and their molecular structure and thermal behavior were characterized. IL toxicity against pre-osteoblast (MC3T3-E1) and human gingival fibroblast (HGF-1) cells, as well as the antimicrobial activity against bacterial strains relevant to the oral environment, were evaluated. For some IL compositions it was established a safe range of concentrations that ILs can be used, in which the minimum inhibitory concentration (MIC) against bacteria was lower than the concentration that inhibits 50% of cellular enzymatic activity (IC 50). These compounds were used as coatings of commercially pure titanium (cpTi) samples and the coated and non-coated samples were characterized. X-Ray photoelectron spectroscopy was used to understand the intermolecular interactions between IL molecules and Ti surface. Atomic force microscopy (AFM) provided a morphological map of surfaces as well as adhesion force of coatings and UV-Vis spectroscopy was used to understand their release profile. ILs were also tested in regards to their anti-corrosive and lubricant activities and it was observed that these compounds form stable films on the surface providing corrosion protection and lubrication. Finally, the coated surfaces were observed to exert antimicrobial and anti-adhesive activities against bacterial strains while also preserving the compatibility of the surface with gingival fibroblast and bone-forming cells.

Effect of Ionic Liquid Coatings on Early Healing and Osseointegration of Titanium Implants

Effect of Ionic Liquid Coatings on Early Healing and Osseointegration of Titanium Implants
Author: Sutton E. Wheelis
Publisher:
Total Pages: 0
Release: 2022
Genre: Biocompatibility
ISBN:

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Although titanium (Ti) dental implants are known to achieve high success rates and osseointegration in vivo, a higher incidence of implant failures have been recently reported. Implant failures are caused by several factors; however, the nature and intensity of the inflammatory response at the titanium-tissue interface determines the healing outcome of an implant. Surface modifications performed on titanium implants have attempted to directly address both patient and external factors that interfere with constructive inflammation, but often do not address multiple complications that impact osseointegration while maintaining regenerative healing. Dicationic imidazolium-based ionic liquids (IonL) have demonstrated low toxicity, antimicrobial, lubricant, and anticorrosive activities in vitro making them a potential candidate as a multifunctional dental implant coatings. However, the biological response to these coatings in vivo is unknown. The goal of this dissertation was to evaluate the effect IonLs have on inflammation, healing, and osseointegration of titanium dental implants. This research is divided into three aims (i) to investigate the biocompatibility of IonL in a subcutaneous model, (ii) to define and validate success criteria for an oral implantation model and (iii) to investigate the impact of IonL on early healing and osseointegration in an oral implantation model. In each aim a combination of clinical evaluation, histopathology, immunohistochemistry, molecular analysis, and MicroCT was used to track inflammation and healing from 2-30 days (d) in the Lewis rat. In aim 1, an initial evaluation of both IonL-Phe and IonL-Met indicated that IonL appeared in peri-implant tissues and increased acute inflammation at 2d compared to uncoated Ti. At 14d, inflammation receded with more developed peri-implant tissue in coated and uncoated samples with no foreign body giant cells. IonL was no longer observed at 14d, suggesting elution or resorption by macrophages. This aim demonstrated that medium dose IonL-Phe does not significantly interfere with Ti foreign body response in an aseptic environment. In aim 2, a new pre-clinical oral implantation model defined an appropriate baseline for successful Ti osseointegration. Healing was similar to other rodent models: hematoma and acute inflammation at 2d, initial bone formation at 7d, advanced bone formation and remodeling at 14d, and bone maturation at 30d. Overall, this model resulted in a 78.5% osseointegration success rate (>60% bone-to-implant contact (BIC)), similar to human osseointegration. Therefore, This model combines the advantages of a rodent model while maximizing BIC, making it an excellent candidate for evaluation of IonLs. Following aim 2, a pilot in vivo assessment determined medium dose IonL-Phe demonstrated the best histogical response and BIC for the remaining evaluation. In aim 3, IonL-Phe-coated and uncoated cpTi screws were implanted into several demographic groups of rats to represent biological variations that could affect healing. Molecular and histological analysis indicated IonL heightened acute inflammation compared to uncoated Ti. However, the coating was released/resorbed by 7 days and did not negatively affect subsequent bone remodeling in all demographics. Overall, IonL-Phe coating did not disturb oral Ti osseointegration and may provide additional control over the healing environment in scenarios known to be challenged by bacteria, such as peri-implantitis

Redox Active Ionic Liquids from Synthesis to Surface Modification

Redox Active Ionic Liquids from Synthesis to Surface Modification
Author: Thi Tuyet Van Bui
Publisher:
Total Pages: 0
Release: 2015
Genre:
ISBN:

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Ionic liquids (ILs) are described as a new class of molten salts consisting entirely of ions having a melting point below 100°C. Ionic liquids constitute a class of materials with many promising applications in very diverse fields. Their properties can be tailored by modifying the combination of ions in their composition. The introduction of the functional group forms "functionalized or task-specific ionic liquids" and allows us to tune the property for a particular application. Taking the advantage of introducing a monomer group to ILs, we can give rise a new family of functional polymer labeled polymeric ionic liquids or poly(ionic liquids) (PILs). ILs or PILs containing redox active groups are interesting because of their different applications such as molecular electronics, (bio)analytical sensor, energy transduction materials, electrochemical actuator, smart surfaces, solar cells, organic memory devices, as well as polymer based batteries. Since 2000, the research on ionic liquid-modified electrodes became intensively developing area. In term of electrochemical approach and considering the above factors, the work in this thesis focused on three points: i) synthesis of redox active ionic liquids, ii) grafting redox active ionic liquids by electrochemical process, iii) immobilization of redox poly(ionic liquids) on electrode surface. This thesis contains six chapters : -Chapter 1 presents an overview of ionic liquids and Poly(ionic liquids), their composition synthesis and use in electrochemical investigations.-Chapter 2 concentrates on the synthesis of ionic liquids (ILs) and report their protocol. - Chapter 3 reports the immobilization of task-specific ionic liquids on carbon electrodes by means of electrochemical grafting. Chapter 4 studies the formation redox Poly(ionic liquids) onto carbon electrode surfaces using four methods: direct electropolymerization, Graft-fast, Surface Electro-initiated Emulsion Polymerization (SEEP) and Surface-Initiated Atom Transfer Radical Polymerization (SI-ATRP). -Chapter 5 envisages the preparation of bi-functional PILs containing both ferrocene and anthraquinone on polymer chain by SI-ATRP method. -Chapter 6 lists the conclusions of this thesis and displays future prospects for the bi-functional materials.

Nanomanufacturing Techniques in Sustainable Healthcare Applications

Nanomanufacturing Techniques in Sustainable Healthcare Applications
Author: Arbind Prasad
Publisher: CRC Press
Total Pages: 369
Release: 2024-10-29
Genre: Technology & Engineering
ISBN: 1040148158

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The text begins by discussing the processing and characterization of nano-manufactured resorbable bionanocomposites and presents the latest advances in carbon-based polymer nanocomposite materials for sensing applications. It further presents different characterization techniques such as scanning electron, transmission electron, atomic force microscopy, and powder X-ray diffraction for the identification of bionanocomposites. This book: • Introduces nano-manufactured processed composites for biomedical application, processing, and characterization of bionanocomposites. • Presents biobased nano-manufactured processed composites for imaging, tissue repairing, and drug-delivery applications. • Explains future trends of nano-manufactured composites in 3D bio-implants and fluorescent bioimaging. • Highlights the challenges and perspectives of polymeric nano-manufactured composites for biomedical applications. • Covers multifunctional nano-manufactured bio-composites, and advances in polymeric membranes for healthcare applications. It is primarily written for senior undergraduates, graduate students, and academic researchers in the fields of manufacturing engineering, biomedical engineering, materials science and engineering, mechanical engineering, and production engineering.

Current Concepts in Dental Implantology

Current Concepts in Dental Implantology
Author: Ilser Turkyilmaz
Publisher: BoD – Books on Demand
Total Pages: 278
Release: 2015-02-25
Genre: Medical
ISBN: 9535117416

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Implant dentistry has changed and enhanced significantly since the introduction of osseointegration concept with dental implants. Because the benefits of therapy became apparent, implant treatment earned a widespread acceptance. Therefore, the need for dental implants has caused a rapid expansion of the market worldwide. Dental implantology continues to excel with the developments of new surgical and prosthodontic techniques, and armamentarium. The purpose of this book named Current Concepts in Dental Implantology is to present a novel resource for dentists who want to replace missing teeth with dental implants. It is a carefully organized book, which blends basic science, clinical experience, and current and future concepts. This book includes ten chapters and our aim is to provide a valuable source for dental students, post-graduate residents and clinicians who want to know more about dental implants.

Advanced Healthcare Materials

Advanced Healthcare Materials
Author: Ashutosh Tiwari
Publisher: John Wiley & Sons
Total Pages: 421
Release: 2014-05-09
Genre: Technology & Engineering
ISBN: 1118773683

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Offers a comprehensive and interdisciplinary view of cutting-edge research on advanced materials for healthcare technology and applications Advanced healthcare materials are attracting strong interest in fundamental as well as applied medical science and technology. This book summarizes the current state of knowledge in the field of advanced materials for functional therapeutics, point-of-care diagnostics, translational materials, and up-and-coming bioengineering devices. Advanced Healthcare Materials highlights the key features that enable the design of stimuli-responsive smart nanoparticles, novel biomaterials, and nano/micro devices for either diagnosis or therapy, or both, called theranostics. It also presents the latest advancements in healthcare materials and medical technology. The senior researchers from global knowledge centers have written topics including: State-of-the-art of biomaterials for human health Micro- and nanoparticles and their application in biosensors The role of immunoassays Stimuli-responsive smart nanoparticles Diagnosis and treatment of cancer Advanced materials for biomedical application and drug delivery Nanoparticles for diagnosis and/or treatment of Alzheimers disease Hierarchical modelling of elastic behavior of human dental tissue Biodegradable porous hydrogels Hydrogels in tissue engineering, drug delivery, and wound care Modified natural zeolites Supramolecular hydrogels based on cyclodextrin poly(pseudo)rotaxane Polyhydroxyalkanoate-based biomaterials Biomimetic molecularly imprinted polymers

Green Biocomposites

Green Biocomposites
Author: Mohammad Jawaid
Publisher: Springer
Total Pages: 351
Release: 2017-02-11
Genre: Technology & Engineering
ISBN: 3319493825

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This book introduces the concept, design and application of green biocomposites, with a specific focus on the current demand for green biocomposites for automotive and aerospace components. It discusses the mathematical background, innovative approaches to physical modelling, analysis and design techniques. Including numerous illustrations, tables, case studies and exercises, the text summarises current research in the field. It is a valuable reference resource for researchers, students and scientists working in the field of materials science.

Design of Shape Memory Alloy (SMA) Actuators

Design of Shape Memory Alloy (SMA) Actuators
Author: Ashwin Rao
Publisher: Springer
Total Pages: 137
Release: 2015-05-08
Genre: Science
ISBN: 3319031880

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This short monograph presents an analysis and design methodology for shape memory alloy (SMA) components such as wires, beams, and springs for different applications. The solid-solid, diffusionless phase transformations in thermally responsive SMA allows them to demonstrate unique characteristics like superelasticity and shape memory effects. The combined sensing and actuating capabilities of such materials allows them to provide a system level response by combining multiple functions in a single material system. In SMA, the combined mechanical and thermal loading effects influence the functionality of such materials. The aim of this book is to make the analysis of these materials accessible to designers by developing a "strength of materials" approach to the analysis and design of such SMA components inspired from their various applications with a review of various factors influencing the design process for such materials.

Electrospun Nanofibers

Electrospun Nanofibers
Author: Mehdi Afshari
Publisher: Woodhead Publishing
Total Pages: 650
Release: 2016-09-13
Genre: Technology & Engineering
ISBN: 0081009119

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Electrospun Nanofibers covers advances in the electrospinning process including characterization, testing and modeling of electrospun nanofibers, and electrospinning for particular fiber types and applications. Electrospun Nanofibers offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science. Electrospinning is the most commercially successful process for the production of nanofibers and rising demand is driving research and development in this field. Rapid progress is being made both in terms of the electrospinning process and in the production of nanofibers with superior chemical and physical properties. Electrospinning is becoming more efficient and more specialized in order to produce particular fiber types such as bicomponent and composite fibers, patterned and 3D nanofibers, carbon nanofibers and nanotubes, and nanofibers derived from chitosan. Provides systematic and comprehensive coverage of the manufacture, properties, and applications of nanofibers Covers recent developments in nanofibers materials including electrospinning of bicomponent, chitosan, carbon, and conductive fibers Brings together expertise from academia and industry to provide comprehensive, up-to-date information on nanofiber research and development Offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science

The Role of Biofilms in Device-Related Infections

The Role of Biofilms in Device-Related Infections
Author: Mark Shirtliff
Publisher: Springer Science & Business Media
Total Pages: 276
Release: 2008-12-19
Genre: Medical
ISBN: 3540681191

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Approximately 60% of all hospital-associated infections, over one million cases per year, are due to biofilms that have formed on indwelling medical devices. Device-related biofilm infections increase hospital stays and add over one billion dollars/year to U.S. hospitalization costs. Since the use and the types of indwelling medical devices commonly used in modern healthcare are continuously expanding, especially with an aging population, the incidence of biofilm infections will also continue to rise. The central problem with microbial biofilm infections of foreign bodies is their propensity to resist clearance by the host immune system and all antimicrobial agents tested to date. In fact, compared to their free floating, planktonic counterparts, microbes within a biofilm are 50 – 500 times more resistant to antimicrobial agents. Therefore, achieving therapeutic and non-lethal dosing regimens within the human host is impossible. The end result is a conversion from an acute infection to one that is persistent, chronic, and recurrent, most often requiring device removal in order to eliminate the infection. This text will describe the major types of device-related infections, and will explain the host, pathogen, and the unique properties of their interactions in order to gain a better understanding of these recalcitrant infections.