The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The fracture toughness of various core materials.

PURPOSE: This study determined the fracture toughness of four core buildup materials. MATERIALS AND METHODS: Single-edge notch, bar-shaped specimens conforming to the American Society for Testing Materials standard E-399 were fabricated for a high copper amalgam alloy, two composite resins, and a glass ionomer buildup material. The specimens were stored in air for 1 week and then tested in three-point bending mode with an Instron Universal Testing Machine (Instron Corporation, Canton, MA). RESULTS: Fracture toughness values obtained were as follows: Fluorocore (composite resin; Caulk, Milford, DE), 1.54 MN.m-1.5; Ti-Core (composite resin and titanium; Essential Dental Systems, New York, NY), 1.34 MN.m-1.5; Valiant Ph.D. (amalgam; Caulk), 1.29 MN.m-1.5; and Coreshade Glass Ionomer Base Cement (Shofu Inc, Kyota, Japan), 0.55 MN.m-1. 5. CONCLUSIONS: Glass ionomer materials are probably unsuitable as core buildup materials because of their relatively low fracture toughness. Fluorocore, Ti-Core, and amalgam all had fracture toughness values significantly greater than the glass ionomer (P < .01).[1]


  1. The fracture toughness of various core materials. Ziebert, A.J., Dhuru, V.B. Journal of prosthodontics : official journal of the American College of Prosthodontists. (1995) [Pubmed]
WikiGenes - Universities