Interferometria Holografica Digital – Download as PDF File .pdf), Text File .txt) or read online. Esta basado en el estudio sobre la Interferometria Holografica. Gesualdi, M.R.R. () Técnicas de Interferometria Holográfica Usando Cristais Fotorrefrativos da Família das Silenitas Universidade de São Paulo, Instituto. Meaning of interferometria in the Portuguese dictionary with examples of use. Synonyms Técnicas de interferometria holográfica usando cristais O objetivo .
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Eur J OrthodHolography also allows tension distribution analysis along all the sample extension.
A laser is needed to produce a coherent, monochromatic light beam. Strength of biological materials. Holography follows a different principle from conventional photography. Load transmission evaluation by removable distal-extension partial dentures using holographic interferometry.
It does not require mathematical, virtual or artificial simulation of the evaluated object, as in the finite element or photoelasticity methods. Adachi I ; Jose E. Braz Dent J ; Quantitative Analysis Data relative to the comparison between fresh and fixed specimens as well to the comparison between fresh and macerated specimens are presented on Tables 1 and 2respectively. Two-dimensional interterometria stress analysis of traumatized incisor.
Because tension moves perpendicularly to the fringes, it is possible to evaluate tension distribution within the body of the mandible quantitatively since the higher the number of fringes, the greater the tension transmitted and the greater the displacement produced between the original surface and the surface that is subjected interferojetria load.
Introduction Several fields of Dentistry, such interferometriia Prosthodontics, Endodontics, Orthodontics, Periodontists and other, have employed various techniques to evaluate stresses distribution, including photoelasticity, mechanical models, finite element analysis and strain gauge systems This set was fastened to the device by means of a clip-together system enabling the correct repositioning during the experiment Fig.
Yamada 17 stated that the hardness of dry compact bone is 1. The difference in phase between a reference ray and the object ray to be analyzed produces an interference pattern that is recorded on a high-resolution photographic plate hologram.
Because it is a non-destructive method, whose results can be obtained from the very object under study, it enables repeatability of the experiment. The principle of holographic interferometry states that the displacement caused by the action of a force on a body is directly proportional to the number of fringes, and its direction is perpendicular to that of the fringes.
They found that the displacements hholografica maxillas did not coincide with in vivo measurements. In order to have a more accurate model, holografca use of natural anatomic specimens is recommended. Thus, by analyzing the number of fringes and the displacement produced, one can refer to the direction of the tensions.
The influence of the periodontal ligament was clear in the present study, jnterferometria it was observed a marked alteration in the direction of fringes located in the tooth and in the bone of the fresh hemi-mandibles. The macerated hemi-mandibles presented more fringes, with smaller spaces between them; 2 A change in the direction of fringes in the tooth and bone was recorded in the fresh hemi-mandibles. A shutter with electronic exposure control was used to control exposure time for the holographic plate.
Resolution is that of the order of the laser wavelength or interferomeyria of a photographic film Results Qualitative Analysis The holographic images showed that: The findings of this investigation suggest that the use of dry specimens in research and the inference of their results for an in vivo situation must be conservative.
Thus, the load cell measures local deformation, and it is known that the elasticity module of the bone depends also on its location. The hemi-mandible was subjected to a g static load.
Meaning of “interferometria” in the Portuguese dictionary
In spite of these findings, macerated skulls are still used as study models Braz Oral Res ; Because the holographic method interferometrla highly sensitive to small bone interferometriaa and deformations, and given the controversy among researchers as to the use of macerated skulls, and the difficulty of obtaining fresh post-mortem human skulls, the purpose of this study was to compare the distribution of tensions produced under static load in fresh controlmacerated and fixed dog mandibles.
Strain and stress analysis by holography and speckle interfwrometria. The dry skull model in orthodontics. These images show that the tensions created in the area of application of force are more intense and that these tensions are dissipated and absorbed intfrferometria they are transmitted along the mandibular bone. Verh K Acad Geneeskd Belg ; All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
The incidence of laser light upon the developed film showed the image of the mandible with a pattern of fringes, caused by the interference produced by superimposing the two holograms. In a previous study 10moisture in fresh dog skulls may have influenced their results in comparison to macerated skulls, by making them less rigid and leading to a less pronounced displacement of bone.
Holographic interferometry method for assessment of static load stress distribution in dog mandible
The value of the macerated skull as a model used in orthopaedic research. Quantification of holographic fringe data: Govaert L, Dermaut L. For example, to study occlusal force dissipation, it is possible to verify the course of the force lines in the entire craniofacial complex, in addition to the underlying bone.