scholarly journals Enhancing the mechanical properties of calcium phosphate cements using short-length polyhydroxyalkanoate fibers

2016 ◽  
Vol 124 (2) ◽  
pp. 180-183 ◽  
Author(s):  
Toru OGASAWARA ◽  
Takenori SAWAMURA ◽  
Hirotaka MAEDA ◽  
Akiko OBATA ◽  
Hitoshi HIRATA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Short Length ◽  
Calcium Phosphate Cements

Synthesis of Alpha-Tricalcium Phosphate by Wet Reaction and Evaluation of Mechanical Properties

2012 ◽  
Vol 727-728 ◽  
pp. 1164-1169 ◽  
Author(s):  
Mônica Beatriz Thürmer ◽  
Rafaela Silveira Vieira ◽  
Juliana Machado Fernandes ◽  
Wilbur Trajano Guerin Coelho ◽  
Luis Alberto Santos
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Tricalcium Phosphate ◽  
Calcium Nitrate ◽  
Chemical Precipitation ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcium Phosphate Cements

Calcium phosphate cements have bioactivity and osteoconductivity and can be molded and replace portions of bone tissue. The aim of this work was to study the obtainment of α-tricalcium phosphate, the main phase of calcium phosphate cement, by wet reaction from calcium nitrate and phosphoric acid. There are no reports about α-tricalcium phosphate obtained by this method. Two routes of chemical precipitation were evaluated and the use of two calcinations temperatures to obtain the phase of cement. The influence of calcination temperature on the mechanical properties of cement was evaluated. Cement samples were characterized by particle size analysis, X-ray diffraction, mechanical strength and scanning electron microscopy. The results demonstrate the strong influence of synthesis route on the crystalline phases of cement and the influence of concentration of reactants on the product of the reaction, as well as, on the mechanical properties of cement.

Role of macropore size in the mechanical properties and in vitro degradation of porous calcium phosphate cements

2010 ◽  
Vol 64 (18) ◽  
pp. 2028-2031 ◽  
Author(s):  
Bai Feng ◽  
Meng Guolin ◽  
Yuan Yuan ◽  
Liu Changshen ◽  
Wang Zhen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
In Vitro Degradation ◽  
Calcium Phosphate Cements

scholarly journals Preparation, Structural Characterization, and Biomedical Applications of Gypsum-Based Nanocomposite Bone Cements

2021 ◽  
Author(s):  
Hesham F. El-Maghraby ◽  
Yaser E. Greish
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Structural Characterization ◽  
Room Temperature ◽  
Bone Cements ◽  
Calcium Phosphate Cements ◽  
Metallic Implants ◽  
Hard Tissues ◽  
Subsequent Conversion ◽  
High Degree

Hard tissues are natural nanocomposites comprising collagen nanofibers that are interlocked with hydroxyapatite (HAp) nanocrystallites. This mechanical interlocking at the nanoscale provides the unique properties of hard tissues (bone and teeth). Upon fracture, cements are usually used for treatment of simple fractures or as an adhesive for the treatment of complicated fractures that require the use of metallic implants. Most of the commercially available bone cements are polymer-based, and lack the required bioactivity for a successful cementation. Besides calcium phosphate cements, gypsum is one of the early recognized and used biomaterials as a basi for a self-setting cementation. It is based on the controlled hydration of plaster of Paris at room temperature and its subsequent conversion to a self-setting solid gypsum product. In our work, we have taken this process further towards the development of a set of nanocomposites that have enhanced bioactivity and mechanical properties. This chapter will outline the formation, characterization, and properties of gypsum-based nanocomposites for bone cement applications. These modified cements can be formulated at room temperature and have been shown to possess a high degree of bioactivity, and are considered potential candidates for bone fracture and defect treatment.

Dental Cements

2017 ◽  
Vol 15 (13) ◽  
pp. 25-27
Author(s):  
Nicolae Angelescu ◽  
Vasile Bratu ◽  
Elena Valentina Stoian ◽  
Dan Nicolae Ungureanu ◽  
Ana-Maria Gurban
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Raw Materials ◽  
Clinical Use ◽  
Calcium Phosphate Cements ◽  
Perfect Adaptation ◽  
Rate Processes ◽  
The Subject ◽  
Calcium And Phosphorus ◽  
Special Category

AbstractCalcium-phosphate cements is one of the most popular types of biomaterials, both due to their specific properties of self - setting and of their superior biocompatibility.Although in general the phosphocalcic cements, which are the subject of the present paper, have somewhat lower mechanical properties than other biomaterials based on calcium and phosphorus, or even other dental cements of the same nature. The ceramic compositions presented in the present paper constitute a special category of biomaterials due to other notable advantages that characterize them. Thus, this category of materials is defined by a near-perfect adaptation to the surface of the biological tissue, as well as by a convenient resorption rate, processes followed by the generation of optimal bone formation. In this paper are presented principles of realization of the calcium-phosphate cements (raw materials and conditions of production), as well as the properties of these biomaterials, insisting, in particular, on the chemistry of the setting reactions. At the same time, informations regarding the possibilities of clinical use, such as implants are presented.

Mechanical Properties of Calcium Phosphate Cements (CPC) for Bone Substitution: Influence of Fabrication and Microstructure

2011 ◽  
Vol 493-494 ◽  
pp. 409-414
Author(s):  
Jing Tao Zhang ◽  
Franck Tancret ◽  
Jean Michel Bouler
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Compressive Strength ◽  
Calcium Phosphate ◽  
Reliable Method ◽  
Weibull Statistics ◽  
Mean Values ◽  
Microstructural Parameters ◽  
Calcium Phosphate Cements ◽  
Dental Applications

Calcium phosphate cements have been widely used in medical and dental applications for decades. However, their intrinsic high brittleness and low strength prohibit their use in many stress-bearing locations, which would require an improvement in mechanical properties. The influence of microstructural parameters on the latter have nevertheless barely been investigated in a systematic manner. Furthermore, due to their inferior reproducibility which is sensitive to the variations introduced during the preparation and the way they are measured, mechanical properties of CPC cannot simply be characterized using mean values, but request a more reliable method. In this aim, apatite cements have been fabricated by mixing liquid and powders based on α-TCP (α-tricalcium phosphate), and their mechanical properties have been measured (Young’s modulus, fracture toughness, compressive strength and flexural strength) in wet environment as a function of various parameters (liquid-to-powder ratio; amount and morphology of porosity, including macropores created by porogens). The reliability of compressive strength of CPC is analysed using Weibull statistics. The above results indicate that fabrication and microstructural features of CPC significantly influence their mechanical properties.

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