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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Because of the short time of formalin fixing, significant changes in the biochemical composition of the bone tissue may not have occurred. Therefore, tensions transmitted were more intense than in fresh samples, corroborating the results of Clerk et al. Holographic interferometric double exposition method. The following devices were set upon the holographic table: Effect of different prosthetic restorative materials on occlusal load distribution.
Shchepinov V, Pisarev VS. Because tension moves perpendicularly to the fringes, it is possible to evaluate tension distribution within interfeometria 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 to load.
Yamada H, Evans FG. A difference in the direction of stress transmission was also observed. Chorres I ; Antonio C.
A shutter with electronic exposure control was used to control exposure time for the holographic plate. Verh K Acad Geneeskd Belg ; When developed and suitably exposed to laser light, this hologram nolografica a three-dimensional image of the object. The reflected beam reference beam interacted with the object beam to produce a hologram on the film.
The effects of class II elastic force on a dry skull measured by holographic interferometry. In the fixed and macerated specimens, the direction of fringes remained unchanged; 3 Spacing between the fringes was smaller near the point of load application and increased progressively along the mandible towards the fixed extremity; 4 The pattern of fringes was also different in direction; in fixed and macerated specimens the fringes showed greater inclination than in fresh hemi-mandibles, meaning that they underwent torsion.
In fact, stress transmission in the experimental conditions was twice as large as in the control group.
Holographic interferometry method for assessment of static load stress distribution in dog mandible
Stress analysis of fresh and macerated dog mandibles. In spite of these findings, macerated skulls are still used as study models A special device for fastening the hemi-mandibles was designed and assembled to standardize the characteristics of load application during the experiment in relation to intensity, point of application, direction, as well as to enable the return of the hemi-mandibles to the initial position after the maceration and formalin-fixing procedures.
This set was fastened to the device by means of a clip-together system enabling the correct repositioning during the experiment Fig. At the same time, beams from the same laser source hit the mirror. Adachi I ; Jose E. Qualitative evaluation is achieved by observing the aspect and direction of the fringes 8. After sedation and euthanasia of the animals, the mandibles were surgically removed and all the surrounding soft tissues skin, mucosa, ligaments, muscles and gingival tissue were removed.
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 of tensions produced under static load in fresh controlmacerated and fixed dog mandibles.
Meaning of “interferometria” in the Portuguese dictionary
Holography follows a different principle from conventional photography. Photoelastic analysis of stress distribution on parallel and angled implants after installation of fixed prostheses.
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 as they are transmitted along the mandibular bone. They inetrferometria that formalin fixing causes agglutination of collagenous fibers.
It does not require mathematical, virtual or artificial simulation of the evaluated object, as in the finite element or photoelasticity methods. The influence of the periodontal ligament was clear in the present study, as it was observed a interferomefria alteration in the direction of fringes located in the tooth and in the bone of the fresh hemi-mandibles.
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. All components were secured on an optical table buffered by compressed air Newport in order to avoid vibrations.
This method, however, is not as accurate as holographic interferometry because it uses only the object beam to form the image. Fresh hemi-mandibles were thus seen to transmit less tension than the corresponding fixed and macerated samples. Mandibles were then cut through the mental region using a scalpel blade.
Introduction 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