Biomaterials Science  -  Processing, Properties, and by Roger Narayan, Visit Amazon's Amit Bandyopadhyay Page,

By Roger Narayan, Visit Amazon's Amit Bandyopadhyay Page, search results, Learn about Author Central, Amit Bandyopadhyay, , Susmita Bose

This ebook comprises 18 papers from the subsequent new release Biomaterials and floor homes of Biomaterials symposia held in the course of the 2010 fabrics technology and know-how (MS&T'10) assembly, October 17-21, 2010, Houston, Texas. themes contain: Biocompatible Coatings; Drug supply and Anti-Microbial Coatings; Ceramic and metal Biomaterials; Biomaterials for Tissue Engineering; and floor Modification.Content:

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The samples were sputter-coated with Au/Pd and then observed in an SEM (Hitachi S-4700) at an accelerating voltage of 5 kV and a working distance of 12 mm. RESULTS AND DISCUSSION The as-formed FEF construct (approximately 36 mm x 30 mm x 6 mm thick) was obtained by extrusion of the paste thorough an orifice of diameter 580 um. The diameter of the deposited filaments (-600 urn) was slightly larger than the diameter of the orifice because of expansion of the plastic paste after extrusion. The width of the rectangular pores in the plane of the deposition was -500 urn and the Biomaterials Science-Processing, Properties, and Applications • 49 Freeze Extrusion Fabrication of 13-93 Bioactive Glass Scaffolds porositv of the as-formed construct (including the porosity between the glass particles in the filaments) was -75%.

Sealing properties of great importance deal with microleakage resistance, the retention developed between the dental cement and the environment, compressive strength and acid resistance. Integration with tooth tissue is a powerful feature of the Caaluminate based systems and the foundation of the Ca-aluminate technology (Ceramir) platform. Secondary caries occurs not only after filling procedures but also after other restorative procedures such as the cementation of crowns and bridges. General properties of a dental cement based on Ca-aluminate have been presented earlier [21, 22].

The material cures as a result of hydration reactions between Ca-aluminates and water. Through the hydration, new phases of hydrates are formed, which to a great part establish the microstructures necessary for different dental applications. Important aspects relate specifically to 1) the cement phase, 2) the particle size of the cement, 3) the hydration temperature, 4) the environment (complementary ions), 5) processing agents, and 6) the volume involved. The setting time should be relatively short, below 30 minutes, and suitably in the interval of 5-15 minutes.

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