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An evaluation of alternative alloys to type III gold for use in fixed prosthodonticsNitkin, Donald A. January 1974 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1974. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 59-62).
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The influence of heat-treatment on the base-metal removable partial denture alloysMorris, Harold F. January 1973 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1973. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 71-72).
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An evaluation of the castability of base metal alloys using an unconventional sprue designGale, Marie-Agnes G. January 1982 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1982. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 41-43).
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A scanning electron microscope study of marginal distortion in porcelain fused to metal restorations a thesis submitted in partial fulfillment ... restorative dentistry (crown and bridge) ... /Golestaneh, Roohollah. January 1979 (has links)
Thesis (M.S.)--University of Michigan, 1979.
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Kritische Betrachtung der Literature und Forschungsergebnisse über Vermeidung des Schwindmasses des gegossenen GoldesRies, Karl, January 1935 (has links)
Thesis (Doctoral)--Ludwig-Maximilians-Universität zu München, 1935.
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Kritische Betrachtung der Literature und Forschungsergebnisse über Vermeidung des Schwindmasses des gegossenen GoldesRies, Karl, January 1935 (has links)
Thesis (Doctoral)--Ludwig-Maximilians-Universität zu München, 1935.
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A scanning electron microscope study of marginal distortion in porcelain fused to metal restorations a thesis submitted in partial fulfillment ... restorative dentistry (crown and bridge) ... /Golestaneh, Roohollah. January 1979 (has links)
Thesis (M.S.)--University of Michigan, 1979.
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Auswirkungen thermischer Schocks und Biegefestigkeitsuntersuchungen an metallkeramischen Seitenzahn-rückenkonstruktionen unter besonderer Berücksichtigung von MK-CÖ- und VSG-BO-Wachsfertigteilen sowie eines Chrom-Kabalt-BondingKlimek, Joachim, January 1987 (has links)
Thesis (doctoral)--Universität Köln, 1987. / Vita. Includes bibliographical references (p. 87-98).
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Eine Konservierungsmethode für geätzte Ni-Cr-Dentallegierungen zur Erzielung wasserbeständiger MetallklebungenDziadeck, Klaus. January 1987 (has links)
Thesis (doctoral)--Universität Köln, 1987. / Vita. Includes bibliographical references (p. 64-71).
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Caracterização microestrutural e resistência à corrosão de ligas Ni-Cr-Mo refundidas utilizadas em próteses dentáriasSousa, Lucíola Lucena de [UNESP] 02 1900 (has links) (PDF)
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sousa_ll_me_guara.pdf: 4793010 bytes, checksum: d84c2d1dd8b44e4a5266efeb08658650 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Universidade Estadual Paulista (UNESP) / O objetivo deste trabalho foi estudar o efeito de diferentes processos de refundição e resfriamento na microestrutura e nas propriedades mecânicas e eletroquímicas de duas ligas de Ni-Cr-Mo, Wiron 99 e Wironia, utilizadas em próteses dentárias fixas. As ligas como recebidas (bruta de fusão) foram refundidas em chama aberta com maçarico oxi-GLP e por indução em forno de alta freqüência utilizando diferentes velocidades de resfriamento. As microestruturas reveladas por ataque eletroquímico nas amostras bruta de fusão (BF), foram analisadas por microscopia ótica e eletrônica de varredura, apresentam caráter dendrítico; as amostras refundidas apresentam duas fases: uma solução sólida de Ni-Cr-Mo e precipitados. A região de precipitados tem maior teor de Mo que na fase principal. As amostras Wironia refundida em chama aberta (MRL), refundidas por indução seguida de resfriamento em água fria (IRR) e seguida de resfriamento natural (IRL) apresentam maior número de precipitados que a Wiron 99. O estudo eletroquímico foi realizado em meio de NaCl 0,9% em massa, pH 6 a 37ºC, utilizando as técnicas de medidas de potencial em circuito aberto, polarização potenciodinâmica e voltametria cíclica. Diferentes procedimentos de refundição alteram parâmetros eletroquímicos como potencial de estabilização em circuito aberto, densidade de corrente e intervalo de passivação. As alterações foram mais pronunciadas para as ligas Wironia IRL e Wiron 99 IRL. Ensaios de imersão durante um ano em solução de NaCl 0,9% mostraram dissolução de Ni, Cr e Mo em maior quantidade para a Wironia MRL e IRR. A dureza e a resistência à abrasão foram menores nas ligas refundidas do que nas BF. Diferentes procedimentos de refundição e resfriamento afetam a microestrutura e a resistência à corrosão destas ligas. / This work aim has been to study the effect of different recast and cooling processes in microstructure and in mechanical and electrochemical properties of two Ni-Cr-Mo alloys, Wiron 99 and Wironia, used in fixed dental prostheses. The alloys as-received (as-cast) have been recast in an open flame (oxy-LPG torch) and through induction in high frequency furnace by using different cooling rates. Microstructures revealed through as-cast (AC) electrochemical attack analyzed through light and scanning electronic microscopy present dendritic character; recast samples present two phases: a Ni-Cr-Mo solid solution and precipitates. Precipitates region has Mo content greater than the main phase. Wironia samples recast through open flame (TSC - Torch followed by slow cooling), recast through induction followed by cooling in cold water (IRC - Induction followed by rapid cooling) and then by natural cooling (ISC - Induction followed by slow cooling) present a precipitate number greater than Wiron 99. Electrochemical study has been carried out in 0.9% NaCl, pH 6 at 37°C, by using open circuit potential techniques, potentiodynamic polarization and cyclic voltammetry. Different recast procedures change electrochemical parameters as stabilizing potential in open circuit, current density and passivation interval. Changes have been more markedly for ISC Wironia and ISC Wiron 99. Immersion tests during one year in NaCl 0.9% have displayed Ni, Cr and Mo dissolution in major quantity for TSC and IRC Wironia. Hardness and abrasion resistance have been smaller for recast than in AC alloys. Different recast and cooling procedures affect microstructure and corrosion resistance of these alloys.
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