Preliminary materials

Is Macroporosity Absolutely Required for Preliminary in Vitro Bone Biomaterial Study? A Comparison between Porous Materials and Flat Materials

Porous materials are highly preferred for bone tissue engineering due to space for blood vessel ingrowth, but this may introduce extra experimental variations because of the difficulty in precise control of porosity. In order to decide whether it is absolutely necessary to use porous materials in in vitro comparative osteogenesis study of materials with different chemistries, we carried out ost...

Preliminary Investigation into the Use of Surface Modification Techniques to Detect Organic Materials in Meteorites

A Preliminary Comparative Toxicity Assessment of Materials Used in Aquatic Construction

Environment Canada undertook a preliminary comparative toxicity assessment of selected materials that may be utilized in construction projects located in the aquatic environment. That project involved introducing Fahlstrom sized test stakes (3.9x0.54x26.4 cm) to both fresh and salt water for toxicity testing. Rainbow Trout, Daphnia magna and Microtox testing was conducted in freshwater and Thre...

Comparison of resorbable and nonresorbable guided bone regeneration materials: a preliminary study.

The purpose of this study was to compare bone regeneration within a surgically created defect using three different resorbable membranes (polyglactin 910 knitted mesh/Vicryl, freeze-dried fascia lata, and crosslinked bovine type I collagen/BioMend) and two nonresorbable membranes (expanded polytetrafluoroethylene/Gore Tex, and polytetrafluoroethylene/Millipore). Each of three adult male dogs un...

Disturbing effect of different dental materials on the MRI results: preliminary study.

The influence of different dental materials used for conserving reconstruction of teeth on the magnetic resonance imaging assessed on the basis of changes in NMR proton relaxation T1 of the physiological environment represented by the physiological salt solution has been studied. The dental materials studied varied in a wide range of chemical compositions: composites (Silux Plus made by 3M Dent...