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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In all hemi-mandibles, the fringes were more compact in the region closest to the point of force application and spacing between fringes increased steadily along the length of the mandible, towards the fixed extremity. Em seguida, foram randomizadas em 2 grupos: All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
Double-exposure holographic interferometry was applied and holograms were obtained from 12 fresh hemi-mandibles under static load control groupwhich were randomly assigned to 2 groups: 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.
Because of the short time of formalin fixing, significant changes in the biochemical composition of the bone tissue may not have occurred.
Finite elements study of the FlexiPost and FlexiFlange post system in a maxillary central incisor. This method allows the detection of minute movements of the order of nanometers, as well as overall qualitative and quantitative visualization of the trajectory of the tensions generated upon load application. The use of mathematical programs or artificial models of resin material to simulate real conditions is not particularly ideal.
They found that the displacements of maxillas did not coincide with in vivo measurements. The laser was projected onto the hemi-mandible and produced a second hologram on the same film by the same process.
The reflected beam reference beam interacted with the object beam to produce a hologram on the film. Dry skulls are thus used as experimental models because, although they do not present cartilage and fibrous tissues, interferometriw least the trabeculae and other anatomic features are the same as those found in vivo.
All components were secured on an optical table buffered by compressed air Newport in order to avoid vibrations. When developed and suitably exposed to laser light, this hologtafica reconstructs a three-dimensional image of the object.
One drawback in the use of load cells is that they are activated according to deformation in the surface which they are attached to. This method, however, is not as accurate as holographic interferometry because it uses only the object beam to form the image.
Meaning of “interferometria” in the Portuguese dictionary
In addition, there was an approximate two-fold difference between the fresh-fixed and fresh-macerated states. It is also known that the force is directly proportional to the displacement Hooke’s lawi. However, in the fixed and macerated specimens, the direction of the fringes underwent no marked change, but rather remained constant, with tooth and bone behaving as a single body.
Load transmission evaluation by removable distal-extension partial dentures using holographic interferometry. 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. Discussion 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.
INTERFEROMETRIA – Definition and synonyms of interferometria in the Portuguese dictionary
interferometriq Several fields of Dentistry, such as 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 The value of the macerated skull as a model used in orthopaedic research.
They stated that formalin fixing causes agglutination of collagenous fibers. Braz Oral Res ; The hemi-mandible was subjected to a g static load.
Services on Demand Journal. However, depending on the type of analysis, the anatomical specimens must be fresh because macerated specimens will produce different results.
The importance of humidity in the in vitro study of the cranium with regard to initial bone displacement after force application. Mandibles were then cut through the mental region using a scalpel blade. Med Eng Phys ; The holographic interferometry method was efficient in quantifying and qualifying tension transmission.
The dry skull model in orthodontics. Because the holographic method is highly sensitive to small bone displacements 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 interfreometria tensions produced under static load in fresh controlmacerated and fixed dog mandibles.
Fresh hemi-mandibles were thus seen to transmit less tension than the corresponding fixed and macerated samples. The laser was emitted continually by a direct current power supply. Therefore, it is important to emphasize that macerated bone specimens have a different behavior when compared to that of fresh bones.
The paired t-test and Wilcoxon non-parametric test were applied to the data. Results Qualitative Analysis The holographic images showed that: Eur J Orthod ;