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 the present study, the macerated specimens presented a larger number of fringes, with smaller spacing between them. Qualitative analysis of stress distribution in tooth-implant and implant-supported prosthesis by means of holographic interferometry method.
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. Services on Demand Journal.
In spite of these findings, macerated skulls are still used as study models Qualitative evaluation is achieved by observing the aspect and direction of the fringes 8. A shutter with electronic exposure control was used to control exposure time for the holographic plate. Effect of different interefrometria restorative materials on occlusal load distribution.
Holographic interferometry method for assessment of static load stress distribution in dog mandible
The use of macerated skull as an experimental model in holography has, however, been questioned recently. 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. The mandibles of 6 dogs Canis familiars aged approximately 4 years hologeafica weighing 12 kg were used.
Chorres I ; Antonio C. The specimens were submitted to the same initial force and interfrometria respective holograms were obtained. Finite elements study of the FlexiPost and FlexiFlange post system in a maxillary central incisor. At the same time, beams from the same laser source hit the mirror. Quantification of holographic fringe data: Stress analysis of fresh and macerated dog mandibles. The experiment was carried out in a totally dark, draft-free environment.
Figures 45 and 6 show images of specimens of fixed right hemi-mandible, fresh left hemi-mandible and macerated left hemi-mandible, respectively.
hologgrafica Eur J Orthod ; It does not require mathematical, virtual or artificial simulation of the evaluated object, as in the finite element or photoelasticity methods.
The hemi-mandible was subjected to a g static load. Thus, the load cell measures local deformation, and it is known that the elasticity module of the bone depends also on its location. A special device for fastening the hemi-mandibles was designed and assembled to holografida 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.
An average two-fold tension increment was observed in the experimental conditions. Holographic interferometric double exposition method.
INTERFEROMETRIA – Definition and synonyms of interferometria in the Portuguese dictionary
Given that the process of maceration leads to bone drying and loss of fibrous connective tissue, a question remains as to whether the results obtained with macerated skulls could be transferred to the in vivo situation. Because the holographic method is highly sensitive to small bone displacements and deformations, and interderometria 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.
Location of the centre of resistance of the upper dentition and the nasomaxillary complex.
Em seguida, foram randomizadas em 2 grupos: Govaert L, Dermaut L. Adachi I ; Jose E. Therefore, tensions transmitted were more intense than in fresh samples, corroborating the results of Clerk et al.
Holography follows a different principle from conventional photography. Fresh hemi-mandibles were thus seen to transmit less tension than the corresponding fixed and macerated samples. 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.
In addition, there was an approximate two-fold difference between the fresh-fixed and fresh-macerated states. The influence of the periodontal ligament was clear in the present study, as it was observed a marked alteration in the direction of fringes located in the tooth and in the bone of the fresh hologravica.
The use of mathematical programs or artificial models of resin material to simulate real conditions is not particularly ideal. The results of this investigation did not converge with the findings of Kannan 19who found little difference in magnitude in interfefometria tensions developed in vivo and in dry monkey skulls, measured by means of load cells.
The dry skull model in orthodontics. The film was developed and fixed. The effects of class II elastic force on a dry skull measured by holographic interferometry. 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.
Meaning of “interferometria” in the Portuguese dictionary
The theory of fringe formation in holographic interferometryhas been shown in other studies 14, 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 Two-dimensional photoelastic stress analysis of traumatized incisor.
Thus, by analyzing the number of fringes and the displacement produced, one can refer to the direction of the tensions. The importance of humidity in the in vitro study of the cranium with regard to initial bone displacement after force application.