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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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. Calcif Tissue Int ; In order to have a more accurate model, the use of natural anatomic specimens is recommended. Strain and stress analysis by holography and speckle interferometry.
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: When activated, the laser illuminated the surface of the tension-free hemi-mandible and was reflected object beamreaching the holographic film. Braz Oral Res ; Govaert L, Dermaut L.
Holographic interferometry method for assessment of static load stress distribution in dog mandible
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. Brazilian Society for Dental Research; The following equations 16using data of Figure 3were used for quantitative measurement of displacement.
The hemi-mandible was subjected to a g static load. 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.
One method enabling direct use of the object being studied, and which has been used in several fields of dentistry, is holographic interferometry. Am J Orthod ; 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 to load.
The use of macerated skull as an experimental model in holography has, however, been questioned recently. One drawback in the use of load cells is that they are activated according to deformation in the surface which they are attached to. Holography follows a different principle from conventional photography.
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 After initial holograms were taken, 12 fresh hemi-mandibles were assigned to 2 groups: Em seguida, foram randomizadas em 2 grupos: The reconstructed image of the hologram contains most of the information of the object.
An average two-fold tension increment was observed in the experimental conditions. It is also known that the force is directly proportional to the displacement Hooke’s lawi.
Effects of headgear traction on the facial skeleton of the monkey: Dermault LR, Beerden L. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
The results of this investigation did not converge with the findings of Kannan 19who found little difference in magnitude in the tensions developed in vivo and in dry monkey skulls, measured by means of load cells. In the present study, the macerated specimens presented a larger interfsrometria of fringes, with smaller spacing between them. Two-dimensional photoelastic stress analysis of traumatized 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. Holographic interferometric double exposition method. The holograms obtained in the present study revealed that there was a interfero,etria in the stress transmission among fresh, fixed and macerated mandibles.
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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. Yamada 17 stated interfermetria the hardness of dry compact bone is 1. The paired t-test and Wilcoxon non-parametric test were applied to the data.
Braz Dent J ; The reflected beam reference beam interacted with the object beam to produce a hologram on the film. Services on Demand Journal. Location of the centre of resistance of the upper dentition and the nasomaxillary complex.
Meaning of “interferometria” in the Portuguese dictionary
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. The mandibles of 6 dogs Canis familiars aged approximately 4 hollografica and weighing 12 kg were used. 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.
The importance of humidity in the in vitro study of the cranium with regard to initial bone displacement after force application. The laser was emitted continually by a direct current power supply. The holographic interferometry method was efficient in quantifying and qualifying tension transmission. J Am Dent Assoc ; J Osaka Dent Univ ; Study of stress distribution in loaded tooth using holographic interferometry method.
Holographic evaluation of the marginal fits of complete crowns loaded at the central fossa. Strength of biological interffrometria.