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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Meaning of “interferometria” in the Portuguese dictionary
It does not require mathematical, virtual or artificial simulation of the evaluated object, as in the finite element or photoelasticity methods. This method, however, is not as accurate as holographic interferometry because it uses only the object beam to form the image. Am J Orthod ; A laser is needed to produce a coherent, monochromatic hologfafica beam. In the present study, the macerated specimens presented a larger number of fringes, with smaller spacing between them. The experiment was carried out in a totally dark, draft-free environment.
Holographic evaluation of the marginal fits of complete crowns loaded at the central fossa. 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.
The film was developed and fixed. All of these techniques have advantages and disadvantages.
Campos I ; Lena K. Intrrferometria 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. The reconstructed image of the hologram contains most of the information of the object.
The mandibles of 6 dogs Canis familiars aged approximately 4 years and weighing 12 kg were used. Holographic interferometric double exposition method.
The holographic interferometry method was efficient in quantifying and qualifying tension transmission. The importance of humidity in the in vitro study of the cranium with regard to initial bone displacement after force application. Braz Dent J ; Braz Oral Res ; Stress analysis of fresh and macerated dog mandibles. Qualitative evaluation is achieved by observing the aspect and direction of the fringes 8. The laser was emitted continually by a direct current power supply.
Em seguida, foram randomizadas em 2 grupos: 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. Photoelastic analysis of stress distribution on parallel and angled implants after installation of fixed prostheses.
In fact, stress transmission in the experimental conditions was twice as large as in the control group.
The holographic images showed that: 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. The hemi-mandibles were placed in such a way that load incidence would be at the incisal edge of the canine, simulating occlusion with the opposing tooth.
J Osaka Dent Univ ; 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 lnterferometria 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.
INTERFEROMETRIA – Definition and synonyms of interferometria in the Portuguese dictionary
At the same time, beams from the same laser source hit the mirror. The experiment began immediately after euthanasia of the animals, and the presence of fresh fibrous connective tissue may have dampened the action of the applied force.
Dermault LR, Beerden L. A difference in the direction of stress transmission was also observed. The dry skull model in orthodontics. Eur J Orthod ; This set was fastened to the device by means of a clip-together system enabling the correct repositioning during the experiment Fig. Med Eng Phys ; Mandibles were then cut through the mental region using a scalpel blade.
Holographic interferometry method for assessment of static load stress distribution in dog mandible
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.
By analogy, if a rigid bar is used to make a lever, a given result will be obtained at the opposite end; if the same load is applied to a less rigid bar with the same dimensions, there will be a lower-intensity result at the opposite end. Verh K Acad Geneeskd Belg ; The value of the macerated skull as a model used in orthopaedic research.
Because of the short time of formalin fixing, significant changes in the biochemical composition of the bone tissue may not have occurred.
The paired t-test and Wilcoxon non-parametric test were applied to the data. However, depending on the type of analysis, the anatomical specimens must be fresh because macerated specimens will produce different results.
Resolution is that of the order of the laser wavelength or that of a photographic film Fresh hemi-mandibles were thus seen to transmit less tension than the corresponding fixed and macerated samples. The theory of fringe formation in holographic interferometryhas been shown in other studies 14, The laser was projected onto the hemi-mandible and produced a second hologram on the same film by the same process.
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