Orientador: Luis Alexandre Maffei Sartini Paulillo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-07-25T05:36:54Z (GMT). No. of bitstreams: 1 Pereira_GiseleDamianadaSilveira_M.pdf: 6881862 bytes, checksum: 025b37d2970888f849e6c9a21a3db961 (MD5) Previous issue date: 1999 / Resumo: O objetivo deste estudo foi avaliar a influência dos métodos de secagem da dentina na resistência às forças de cisalhamento de dois sistemas adesivos dentinários. Foram utilizadas as superfícies vestibular, lingual ou palatina em dentina de 105 terceiros molares íntegros recém-extraídos e armazenados em solução de formol a 10% com pH neutro. Após o condicionamento com ácido fosfórico a 35% por 15 segundos e lavagem com jatos de água por 20 segundos, foram empregados sete métodos de secagem dentinária: jatos de ar por 30 segundos (grupos 1 e 2); jatos de ar por 5 segundos (grupos 3 e 4); sem secagem (dentina sobremolhada, grupos 5 e 6); bolinhas de algodão seco (grupos 7 e 8); bolinhas de algodão úmido (grupos 9 e 10); esponja (pincel tipo "microbrush", grupos 11 e 12) e papel absorvente (grupos 13 e 14). Em seguida, o sistema adesivo Prime & Bond 2.1 foi aplicado nos grupos ímpares e nos grupos pares utilizou-se o sistema adesivo Scotchbond Multi Uso. Cilindros com 3mm de diâmetro e 5 mm de altura foram confeccionados com a resina composta Z-100 na área delimitada para a adesão, obtendo um total de 210 corpos-de-prova. Após 7 dias de armazenamento em ambiente a 37 'GRAUS'C com 100% de umidade relativa, os corpos-de-prova foram submetidos ao ensaio de resistência ao cisalhamento a uma velocidade de 0,5 mm/min. O teste t-Student apontou os resultados: Grupo 9= 23,2 MPa (a), Grupo 3= 21,3 MPa (ab), Grupo 2= 19,5 MPa (bc), Grupo 10= 18,6 MPa (bc), Grupo 14= 16,3 MPa (cd), Grupo 8= 16,1 MPa (cd), Grupo 4= 14,6 MPa (de), Grupo 13= 14,0 MPa (de), Grupo 11= 13,9 MPa (de), Grupo 7= 13,5 MPa (de), Grupo 12= 12,1 MPa (e), Grupo 1= 8,2 MPa (f), Grupo 5= 2,7 MPa (g), Grupo 6= 2,4 MPa (g). Através da análise estatística concluiu se que os valores de adesão para o sistema Prime & Bond 2.1 foram estatisticamente maiores quando esse adesivo foi aplicado nas superfícies dentinárias deixadas úmidas pelo método de secagem. Por outro lado, médias satisfatórias de resistência ao cisalhamento. para o sistema Scotchbond Multi Uso foram obtidas quando este foi aplicado ao substrato seco, contudo, esses valores não apresentaram diferença estatística significativa para os resultados dos grupos onde a dentina permaneceu; mais úmida após sua secagem. Ambos os adesivos apresentaram uma menor resistência adesiva quando aplicados ao substrato sobremolhado, onde nenhum método de secagem foi empregado / Abstract: The aim of the present study was to evaluate the shear bond strength of two adhesive systems when applied to dentin with different degrees of wetness. Buccal, lingual and palatine surfaces of 105 intact third molars recently extracted and stored in 10% formaline were utilized. After conditioning with 35% acid phosphoric for 15 seconds, seven methods of drying dentine substrate were used: Air spray for 30 seconds (Groups 1 and 2); air spray for 5 seconds (Groups 3 and 4); dry cotton pellets (Groups 7 and 8); wet cotton pellets (Groups 9 and 10); sponge (microbrush) (Groups 11 and 12); facial tissue (Groups 13 and 14); and the last group was not dried and the surfaces were left overwet (Groups 5 and 6). Thereafter, the Prime & Bond 2.1 System was applied in odd groups and the Scotchbond Multi Purpose was used in pair groups. Z-100composite cilinders with 3 mm diameter and 5mm height were built in the adhesive area (n=210). After seven days stored in a stove with 37 'DEGREE'C and 35% relative humidity, the especimens were submitted to the shear bond test in a 0,5 mm/min speed. The t-Student test presented the following results: Group 9=23.2 MPa (a); Group 3=21.3 MPa (ab); Group 2=19.5 MPa (bc); Group 10=18;6 MPa (bc); Group 14=16.3 MPa (cd); Group 8=16.1 MPa (cd); Group 4=14.6 MPa (de); Group 13=14.0 MPa (de); Group 11=13.9 MPa (de); Group 7=13.5 MPa {de}; Group 12=12.1MPa (e); Group 1-=8.2 MPa (f); Group 5=2.7 MPa (~); Group 6=2.4 MPa (g). Through the statistical analysis it was concluded that the adhesion values to Prime & Bond 2.1 were greater when this system was applied in a moister surface. On the other hand, the Scotchbond Multi Purpose showed good results to both wet and dry surfaces. The lower shear bond strength values were obtained when both adhesives were applied in a overwet surface, where the water excess was not removed. / Mestrado / Mestre em Clínica Odontológica

~ 1 ~ TITLE Development of strenght skills trought Calisthenics. AUTHOR Bc. Michal Kalimon DEPARTMENT Department of physical education SUPERVISOR PhDr. Martin Dlouhý, Ph.D. ABSTRACT The basis of thesis is describe Calisthenics principes, functions and goals. The result is to clarify whether leads Calisthenic which is exercise with your own weight to develop strength skills. KEYWORDS Key words: Calisthenics, strenght skills, exercise with its own weight

Refractory mastics are used for making compact brickworks or for sealing up the joints. This thesis deals with lenghthening of best before date of Regnaterm mastic, modification of recipe and suggestion of suitable method for evaluating reologic characteristics.

The work is a project of a component that allows lift transform rollers skewing. Three possible ways of construction are introduced. Their advantages and disadvanatages are mentioned. The best option was selected and checked by FEM. Prestressed bolted connection was also worked out. In the conclusion of the paper there is a source code of the computer programme for maximum rollers skew calculation.

This project, elaborated within the engineering studies (code of field of study: N2301), presents experiment of welding of high-strength steel by laser. In this project, the samples of high-strength steel DOMEX 420MC will be welded by laser welding method and the welded joints will then be compared with welds made by MAG method. The theoretical part of this project summarizes the following key words in individual chapters: lasers, technology of welding of steel using laser, welding by MAG method, steel with higher strength, types of defects and check of welded joints. The practical part contains description of and assessment of mechanical tests of welded joints – weld bending test and transverse tension test. Further on, the tests of macrostructure and microstructure of welded joints were conducted and assessed. Final results of whole experiment are reviewed at the end of my diploma thesis.

This thesis is focused to design piston rods for aircraft petrol six-cylinder engine with 102 kW output power and project their form. Other part deals with analysis of balancing of arranging and fort control one of piston rod.

This thesis deals with plasma welding high strength steels. It divided into two parts, the theoretical part described the problems of method plasma welding and welding of high strength steels. In the experimental part of the many exams test the suitability of selected materials and parameters of the keyhole plasma welding. An assessment of the quality and mechanical properties of welded joints.

The project developed in the framework of engineering degree in Mechanical Engineering Technology presents experiment welding of high strength steels Docol using a fiber laser. The work is a literature review describing the properties of welded materials, principles and different types of lasers and laser welding technology. In the experimental part, the validation set welding parameters. Finally, work is the evaluation of experiments.

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