INTERFEROMETRIA HOLOGRAFICA PDF
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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The mandibular ramus was fixed in a metal box by screws and self-polymerizing acrylic resin was hologravica into the box. The effects of class II elastic force on a dry skull measured by holographic interferometry. 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.
The paired t-test and Wilcoxon non-parametric test were applied to the data. 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.
Yamada 17 holgorafica that the hardness of dry compact bone is 1. Two-dimensional photoelastic stress analysis of traumatized incisor. Med Eng Phys ; Quantification of holographic fringe data: Study of stress distribution in loaded tooth using holographic interferometry method.
Brazilian Society for Dental Research; The dry skull model in orthodontics. In addition, there was an approximate two-fold difference between the fresh-fixed and fresh-macerated states. 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. How to cite this article.
Because it is a non-destructive method, whose results can be obtained from the very object under study, it enables repeatability of the experiment. 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 holografia, towards the fixed extremity. One method enabling direct use of the object being studied, and which has been used in several fields of dentistry, is holographic interferometry.
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.
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.
Braz Dent J ; Campos I ; Lena K. This set was fastened to the device by means of a clip-together system enabling the correct repositioning during the experiment Fig. It does not require mathematical, virtual or artificial interfrometria of the evaluated object, holografixa in the finite element or photoelasticity methods.
Meaning of “interferometria” in the Portuguese dictionary
It is also known that the force is directly proportional to the displacement Hooke’s lawi. The hypothesis was that the use of macerated interferomettia like a model to study the stress distribution by means of holographic method could produce different results in comparison to hologtafica bone specimens. This study compared the transmission of tensions in fresh, fixed and macerated dog mandibles in order to clarify the diversity of behavior of bone tissues under dry and moist conditions.
A laser is needed to produce a coherent, monochromatic light beam.
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. 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.
Holographic interferometric double exposition method. Because of the short time of formalin fixing, significant changes in the biochemical composition of the bone tissue may not have occurred. This inteferometria 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 following equations 16using data of Figure 3were used for quantitative measurement of displacement. 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 interferomehria 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.
Adachi I ; Jose E. Stress analysis of fresh and macerated dog mandibles.
Govaert L, Dermaut L. Holographic evaluation of the marginal fits of interferometra crowns loaded at the central fossa. Calcif Tissue Int ; The experiment was carried out in a totally dark, draft-free environment.
By analogy, if a rigid bar is used to interferometrja 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.
Dermault LR, Beerden L.
Am J Orthod ; The film was developed and fixed. The importance of humidity in the in vitro study of the cranium with regard to initial bone displacement after force application. 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.
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