New Developments In Calcium Phosphate Bone Cements

This book presents a state-of-the-art review of the latest advances in developing calcium- phosphate bone cements and their applications. It covers the synthesis methods, characterization approaches, material modification and novel binders, as well as the fabrication technologies of calcium-phosphate-based biomaterials in regenerative medicine and their clinical applications. It also highlights methodologies for fabricating scaffolds, biofunctional surfaces/interfaces and subsequently modulating the host response to implantable/injectable materials, and integrates a series of discussions and insights into calcium-phosphate cements and constructs in bone regenerative medicine. As such, the book not only covers the fundamentals but also opens new avenues for meeting future challenges in research and clinical applications.

Cement-based materials have been used by humans nearly since the dawn of civilization. The Egyptians used lime and gypsum cement to bind their aggregate materials, mud and straw, resulting in bricks that are used for building their famous Egyptian pyramids (between 3000 and 2500 BC). Hydrated cement is a cement material bonded together with water and used for building construction; it is characterized by acceptable chemical, physical, thermal, mechanical, and structural stability. It plays a main role in the creation of vessels for storage, roads to travel on, weather-resistant structure for protection, inert hard stabilizer for hazardous wastes, and so on. Due to the composition of these materials and their advantages, it has been practiced in different applications. Cement is an essential component of making concrete, the single most prevalent building material used worldwide for construction, skyscrapers, highways, tunnels, bridges, hydraulic dams, and railway ties. Besides their numerous desired properties, there are some undesirable features. To overcome these disadvantages, several studies were established to prepare, improve, and evaluate innovative cement-based materials. Despite its oldness and deep research, every year several methods and materials evolve and so do cement technology. This book intends to provide a comprehensive overview on recent advances in the evaluation of these materials.

Bone cements are widely used in orthopaedic applications to anchor implants to existing bone, reconstruct bone and deliver bioactive agents to the body. With an increasing number of bone cements available, it is vital that the correct material is selected for specific clinical procedures. Orthopaedic bone cements reviews the most recent research in this field. Part one discusses the current uses of orthopaedic bone cements with chapters on such topics as hip replacements, verteboplasty and wear particles and osteolysis. Part two reviews materials and types of cement such as acrylic, polymethylmethacrylate and calcium phosphate cements. Chapters in Part three address the mechanical properties of bone cements such as fracture toughness and dynamic creep. The final section examines methods to enhance the properties of bone cements with coverage of themes such as antibiotic loaded bone cements and bioactive cements. With its eminent editor and multidisciplinary team of international contributors, Orthopaedic bone cements is an invaluable reference for materials scientists, medical researchers and all those involved in the development of bone cements for orthopaedic applications and joint replacement. Provides a review of recent research focussing on improving the mechanical and biological performance of bone cements Discusses the current applications of bone cements particularly in hip replacement, verteboplasty and wear particles Reviews types of materials and acrylic, polymethlymethacrylate and calcium phosphate as types of cements

Advances in Calcium Phosphate Biomaterials presents a comprehensive, state-of-the-art review of the latest advances in developing calcium phosphate biomaterials and their applications in medicine. It covers the fundamental structures, synthesis methods, characterization methods, and the physical and chemical properties of calcium phosphate biomaterials, as well as the synthesis and properties of calcium phosphate-based biomaterials in regenerative medicine and their clinical applications. The book brings together these new concepts, mechanisms and methods in contributions by both young and “veteran” academics, clinicians, and researchers to forward the knowledge and expertise on calcium phosphate and related materials. Accordingly, the book not only covers the fundamentals but also open new avenues for meeting future challenges in research and clinical applications. Besim Ben-Nissan is a Professor of Chemistry and Forensic Science at the University of Technology, Sydney, Australia

Due to a great chemical similarity with the biological calcified tissues, many calcium orthophosphates possess remarkable biocompatibility and bioactivity. Materials scientists use this property extensively to construct artificial bone grafts that are either entirely made of or only surface-coated with the biologically relevant calcium orthophospha

Bone is among the most frequently transplanted tissues in the body. In Europe, about one million patients encounter a surgical bone reconstruction annually. The worldwide market of bone replacement materials is currently estimated at 5 billion Euros, with a 10% growth due to the ageing of the population. Natural grafts present several drawbacks which pushed scientists to investigate synthetic biomaterials. Although most synthetic bone substitutes available possess some of the positive properties of autografts, none yet have all the benefits of one's own bone. Among the available biomaterials, Calcium Phosphates (CaPs) are of great interest. Nonetheless, these materials can still be improved in several respects. The main aim of this PhD Thesis is to contribute to the improvement of the properties of CaPs for bone regeneration with primary regard to Calcium Phosphate Cements (CPCs). The Thesis is divided in three main parts: i) Biphasic Calcium Phosphate Cements (BCPCs) with modified solubility and ion release; ii) Fibre Reinforced Calcium Phosphate cements (FRCPCs) with improved mechanical properties; iii) Macroporous CaP scaffolds for simvastatin acid release. In the first part novel biphasic CDHA/ß-TCP cements were obtained by mixing two Tricalcium Phosphate (TCP) polymorphs with different solubility (a-TCP and ß-TCP) at different a-TCP/ß-TCP ratios, and characterised in terms of setting properties, mechanical properties, and degradation. In the second part of this manuscript, new FRCPCs were fabricated with a focus on improving the adhesion fibres/matrix, in order to enhance the load transfer and, thus, the toughness of the material and their physico-chemical properties were investigated. Different approaches were studied. The first approach was to increase the chemical affinity of the fibres towards the matrix, adding an element in the matrix with high affinity to the fibres. In the first approach, TryMethyl Chitosan (TMC) was introduced in the liquid phase of a matrix reinforced with chitosan fibres. In the same line, lactic acid (LA) was added in the liquid phase of cements reinforced with Poly-L-lactic acid (PLLA) yarns. The biological characterisation of FRCPCs was explored using human osteoblastic-like cells MG63 . Another approach was to investigate the potential of low temperature plasma surface modification of PLLA yarns for reinforcement of CPCs. Oxygen low pressure plasma was employed at different treatment times and the surface properties of the untreated and plasma-treated PLLA were evaluated. The third part of this Thesis consisted in producing low temperature (CDHA) or high temperature (ß-TCP) macroporous scaffolds as carriers for Simvastatin acid (SVA), an osteogenic and angiogenic promoter. In order to modulate the drug release beyond the intrinsic capacity of the material, plasma polymerisation with PCL:PEG copolymers was used to dry-coat the CaP scaffolds. The material properties, the plasma polymer layer and the drug release from the scaffold were characterised.

Research into the use of calcium phosphates in the development and clinical application of biomedical materials has been a significantly diverse activity conducted by a wide range of scientists, engineers, and medical practitioners, among others. The field of research in this area can, hence, be truly defined as interdisciplinary, and much interesting work leading to imaginative and innovative solutions for the improvement of health outcomes continues to be generated. It has been the intention of this Special Issue to summarise a number of current topical research advances in this area, as well as to review the important area of calcium phosphate-based biomaterials, namely, composites of hydroxyapatite with carbon-based materials. The scientific papers contained in this Special Issue report on advances in the areas of dental-based materials science, bone cements, use of biomaterials created from natural sources, influences of added agents such as adipose stem cells and statins on bioactivity as well as surface influences on electrical potential of biomaterials and uses of glow discharge methods to remove impurities from biomaterial surfaces.

This book provides an overview of the composition of polymeric and ceramic bone cements. It also discusses complex, biomimetic structures based on biomaterials, such as cells and bioactive molecules, which more closely resemble natural bone The first chapter describes the main concepts of the cementation process and the parameters affecting it, while the second chapter focuses on the composition and structure of candidate biomaterials. Lastly, the third and fourth chapters present recent research aimed at improving the ability of naked biomaterials to enhance bone healing by adding cells and bioactive agents.

Despite the fact that bone cement has been utilized since the 1950's, its polymerization, biocompatibility, and ultimate mechanical properties are still considered lacking, which contributes to implant loosening and failure. In this experiment, specialized magnetic calcium phosphate nanoparticles (MCaP) bound with chitosan are used as a filler material within a methyl methacrylate-based bone cement. It was hypothesized that these particles could be used to control the bone cement's polymerization rate through inductive heating via an oscillating magnetic field. Preliminary testing varied N-N-dimethyl-p-toluidine (NDMT) from 0.25-2.00% and 5-30% weight/volume (w/v) MCaP with 0.8% benzoyl peroxide. Optimal polymerization properties were observed at 10% MCaP with 0.5% NDMT; however samples exhibited significant gas evolution, reducing their mechanical properties. Further researched showed that 10% MCaP in the absence of NDMT was capable of inducing polymerization on a reasonable time scale and showed significantly reduced porosity from gas evolution. Though more quantification and testing remains to be done, this research presents promising evolution in the formulation and use of bone cements.