5/8/2023 0 Comments Blistering fang tales of ariseCopyright © 2017 The Academy of Dental Materials. Clinical failures may be better understood and consequently reduced by sending out the correct message regarding the fracture origin in clinical trials. If adequately performed at a large scale, fractography will assist in optimizing the methods of processing and designing of restorative materials and components. This guidance document will contribute to a more accurate use of fractography and help researchers to better identify, describe and understand the causes of failure, for both clinical and laboratory-scale situations. A compilation of recommendations for specific applications of fractography in Dentistry is also provided. The documentation emphasizes good labeling of crack features, precise indication of the direction of crack propagation (dcp), identification of the fracture origin, the use of fractographic photomontage of critical flaws or flaw labeling on strength data graphics. As visual support, this guidance document will provide micrographs of typical critical ceramic processing flaws, differentiating between pre- versus post sintering cracks, grinding damage related failures and occlusal contact wear origins and of failures due to surface degradation. An extended palette of qualitative and quantitative fractography is provided, both for in vivo and in vitro fracture surface analyses. To provide background information and guidance as to how to use fractography accurately, a powerful tool for failure analysis of dental ceramic structures. Scherrer, Susanne S Lohbauer, Ulrich Della Bona, Alvaro Vichi, Alessandro Tholey, Michael J Kelly, J Robert van Noort, Richard Cesar, Paulo Francisco (Author) [esĪs the first major reference on glass fractography, contributors to this volume offer a comprehensive account of the fracture of glass as well as various fracture surface topography Contributors discuss optical fibers, glass containers, and flatglass fractography In addition, papers explore fracture origins the growth of the original flaws of defects and macroscopic fracture patterns from which fracture patterns evolve This volume is complete with photographs and schematicsĪDM guidance-Ceramics: guidance to the use of fractography in failure analysis of brittle materials. Usually, the latter is possible, being the main contribution of fractography to failure analysis, avoiding future failures to occur in the replaced components. Finally, criteria for the determination of the fracture origin are discussed. The contribution of micro- fractography (mainly electron fractography) to the study of fatigue surfaces is described. Examples of cleavage facets, river, patterns, steps, cleavage tonges, tire tracks, and quasi-cleavage surfaces are given. Brittle fast fracture surfaces are also analyzed. Main characteristics of ductile fracture, dimple formation and coalescence, stretch zones, ripples and elongated dimples are described, as well as standards of laboratory fractured surfaces. In the second part, electron fractography techniques are described, involving higher magnification observations of the fracture surfaces. The conclusions valid for these standard cases can be later extended to other shapes and stress configurations. In the first part, the main features of fracture surfaces of components are analyzed, especially the corresponding to components submitted to standard stress conditions and well defined geometries. The contribution of optical and electron fractography to failure analysis is described. International Nuclear Information System (INIS)
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