Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Knoop"”.
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Dentin Remineralization Around Ceramir Restoration
… obtain highly polished dentin surface. Baseline Knoop micro hardness values were recorded. All specimens were then etched using 37% phosphoric acid for 5 seconds to demineralize dentin and to expose dentin collagen. The Knoop indenter micro hardness measurements were again performed for each …
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Avaliação da sorpção, solubilidade e microdureza de resinas acrílicas após desinfecção com ácido peracético
… de sorpção, solubilidade e microdureza Knoop das resinas acrílicas termopolimerizadas (RATA) e resinas acrílicas quimicamente ativadas (RAQA). Os ensaios de sorpção, solubilidade e microdureza Knoop foram realizados utilizando resina acrílica termopolimerizável e quimicamente ativada da …
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Führt der Einsatz von Caries Detector® bei der Caries profunda zum Entfernen von gesundem Dentin?
… Polarisationsmikroskopie, der Mikrohärte nach Knoop und der Anfärbung mit dem Caries Detector® ermittelte Ausdehnung von in vivo entstandenen Dentinläsionen zu vergleichen. <br>23 frisch extrahierte Zähne mit röntgenologisch bis in das Dentin reichender Approximalkaries wurden mit Hilfe einer …
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Efeito da substituição parcial ou total da canforoquinona por fotoiniciadores alternativos sobre a profundidade de polimerização, dureza e propriedades ópticas de compósitos experimentais
… teste descrito pela ISO4049, o grau de dureza Knoop e a alteração de cor (em especial o grau de amarelo) após estocagem em água e pigmentação extrínseca pelo café. Para análise da profundidade de polimerização utilizou-se um molde cilíndrico bi-partido, cujas dimensões foram 2 mm de diâmetro e …
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Numerical and experimental investigation of mechanical strength of spot welded joints
… but identical indentation curves for Vickers, Knoop or spherical indenters and dual sharp indenters. This suggests that these methods can not be used to predict material plastic properties unless the range of material properties is pre-known. Dual spherical indenters showed significant …
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Student perceptions of the writing process
… types using the PET Type Check (Crantoll & Knoop, 1995) and tlleir learning styles using Kolb'sLearning Styles Inventory (1976). Interviews, classroom observations, and journals provided a data base for case studies llilQ teacher reflection. Results indicated that students perceived the …
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Hybridisation of dental hard tissues with modified adhesive systems: therapeutic impact of bioactive silicate compounds on bonding to dentine
… confocal laser scanning microscopy and Knoop micro-indentation analysis were used to evaluate optically and mechanically adjustments to mineral and water content within the resin bonded-dentine interface. Initially, high microtensile values were achieved in each tested group. All the …
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A study of the recrystallization and the mechanical properties of indium
… to be a follows: hardness, 0.72 Brinell, 1.197 Knoop and 1.266 to 1.402 DPH; tensile strength 388 psi.; elongation, 70%; and reduction in area, 95%. Stress rupture data were obtained, and a master rupture was plotted for indium.</p> <p>A major improvement was made in the etching procedure which …
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Stress and fatigue analysis of SVI-tested camshaft lobes
… most abusively ground lobes prior to testing. Knoop and Nanoindenter microhardness indicate a near-surface rehardening for the most abusively ground lobe (confirmed by metallography), and temper burn for the remaining lobes. X-ray residual stress results made in the opening ramp of the tested …
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Characterization of thermally diffused bordie layers on AISI 1018 steel : residual stresses (by synchrotron radiation) and microhardness
… Microhardness distributions revealed a maximum Knoop and Vickers hardness of 2,050 and 2,150, respectively. Residual stress measurements were obtained from x-ray diffraction data and evaluated using the multiple tilt sin^2[psi] technique for the iron monoboride layer and the substrate. The …
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An exploration of transformation theory and the western tradition: a critical evaluation of a graduate studies class
… pragmatic problem solving model, developed by Knoop, is used to guide thinking about the Western tradition. It is used to guide the analysis, synthesis and writing of the experience of the graduate studies class members. A search through Western history, philosophy. and science revealed …
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Eine Programmtheorie Sozialer Arbeit in der medizinischen Rehabilitation – als Beispiel empirisch-fundierter Theoriearbeit in den Gesundheitswissenschaften
This cumulative dissertation focuses on the theoretical development of social work in medical rehabilitation and its relevance to public health. It is based on five peer-reviewed publications that examine the effectiveness, mechanisms, and theoretical foundations of social work in this field. Some …
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Efficacy of Curodont in Managing Incipient Caries in Primary Teeth
… environment. Specimens were then sectioned, and Knoop microhardness values were measured and calculated (25gf; 10 sec) beginning 25 µm below the outer enamel surface and extending in 25 µm intervals to a depth of 225 µm. Using R software, a linear mixed-effects model was used to evaluate the …
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The Mechanisms of wear of the video head
… were examined for use in this project. Knoop diamond indentation was chosen because experimentation showed it to be capable of measuring wear occuring in situ. This technique was then used to examine the wear associated with different levels of A12O3 and Cr2O3 head cleaning agents. The …
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Schrumpfungsverhalten von Kompositen bei Aushärtung mit unterschiedlichen Polymerisationsgeräten bzw. -verfahren in vitro
… wurde indirekt über die Härtemessung nach Knoop bestimmt, die nach 24 Stunden Lagerung bei 37° C auf der Unterseite der 1,5 mm hohen Proben gemessen wurde. Es wurden vier Feinhybridkomposite (Definite, Herculite XRV, Solitaire 2 und Z250) und ein Mikrofüllerkomposit (Silux Plus) untersucht. …
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Three dimensional surface texture analysis for characterisation of enamel erosion
… surface microhardness was measured using a Knoop hardness tester, step height enamel loss was measured using a white-light confocal profilometer and surface texture was measured using confocal laser scanning microscopy in combination with MountainsMap® surface analysis software. For the …
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Mechanical properties of a new zinc-reinforced glass ionomer restorative material
… molds followed by flattening and polishing. Knoop microhardness (KHN) was performed (25 g, 30 s),on pre-determined areas of the polished surfaces. For toothbrushing wear resistance and roughness, specimens were brushed in an automated brushing machine (200 g) with a suspension of dentifrice …
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The plasticity of diamond
… which account for anisotropy in conventional Knoop indentation hardness of all single crystals, have been reviewed. Particular attention has been given to the role of microplasticity and the nature of crack formation in the deformed zone formed beneath the indenter. It is then shown that a …
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In-vitro Untersuchung der Polymerisation verschiedener Komposite für die Befestigung zahnfarbener konfektionierter Wurzelstifte in Wurzelkanälen
… zu untersuchen. Verwendet wurde hierzu die Knoop-Härte Messung, die eine hohe Korrelation mit der Konversionsrate eines Komposits aufweist. <br>Die Konversionsrate der chemisch härtenden Komposite zeigte ein homogenes, der dual härtenden Komposite stiftnah ein homogenes und stiftfern ein …
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Untersuchung zur säureprotektiven Wirkung der in situ gebildeten Kurzzeit-Pellikel
… mit destilliertem Wasser abgespült. Die Knoop-Mikrohärte wurde vor Versuchsbeginn und nach der Säureerosion gemessen und der Härteverlust errechnet. Die Menge des gelösten Kalziums wurde nach der Säureexposition bestimmt und die Kalziumfreisetzung ermittelt. Zusätzlich wurde die erosiv …
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