Thesis (M.S.)--University of Michigan, Ann Arbor, 1976. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 128-134).

Thesis (M.S.)--University of Michigan, 1979.

Thesis (M.S.)--University of Michigan, 1967.

Thesis (M.S.)--University of Michigan, 1979. / eContent provider-neutral record in process. Description based on print version record.

<p>A well designed metal-based removable partial denture (MBRPD) is a cost-effective and a conservative method of rehabilitating a partially edentulous mouth. The MBRPD demands that the abbutment tooth provides support and/or retention while the abutment tooth, in turn, expects the MBRPD to transmit the forces axially and to be passive when fully seated. For vertical forces to be transmitted axially, occlusal rest seats have to be prepared on the abutment teeth to receive a cast metal rest of the MBRPD. The&nbsp / objective of this study was to compare occlusal rest seat preparations for metal-based removable partial dentures (MBPRD) prepared by dental students at the UWC Oral Health centres, to the corresponding cast metal rests and to determine action taken in response to discovered discrepancies between the rest seat preparation depth and the cast metal occlusal rset thickness.</p>

O propósito deste trabalho foi analisar a produção de prótese removível em três laboratórios da cidade de São Paulo observando o perfil da população que recebeu este tratamento. A produção foi registrada diariamente, por meio de ensaios fotográficos padronizados, durante um mês de trabalho junto aos laboratórios. Foram enviados questionários para complementação de informações das técnicas e materiais utilizados pelos técnicos responsáveis. Da amostra de 367 próteses, 52% foram feitas para mulheres, e 33% para homens; não se notou diferenças estatisticamente significantes entre a quantidade de modelos nos arcos maxilares e mandibulares; segundo a classificação de Kennedy, a Classe I foi a mais freqüente principalmente para os arcos inferiores e, para os arcos superiores, a Classe III; o conector mais utilizado para o arco inferior foi a barra lingual e para o arco superior o tipo em forma de ferradura; com relação aos dentes remanescentes a média de dentes retidos para os arcos inferiores foi de 7,72 dentes, e para os arcos superiores foi de 7,54 dentes; a grande maioria de prótese confeccionada foi a de armação de cobalto-cromo, com grampo circuferencial, ou a barra; as próteses terapêuticas apresentaram uma porcentagem de 5,45% do total. / The aim of this work was to analyze the removable denture production in three dental laboratories, city of São Paulo, regarding to the population profile submitted to this treatment. The production was daily registered, through pattern photographs, during one month of work in each laboratory. Questionnaires were sent in order to obtain a complementation in technical and material information used by the responsible technicians. From the 367 dentures of the sample, 52 % were obtained from women and 33% from men; it was not observed significant statistical differences between the quantity of maxillary and mandibular models; according to Kennedy classification, the Class I was most frequent in inferior dental arches while the Class III was most frequent in superior dental arches; the most used connector was the lingual bar in inferior dental arches and the horseshoe type in superior dental arches; regarding the teeth remaining the mean values were 7.72 teeth for inferior dental arches and 7.54 for superior dental arches; the great majority of prosthesis was confectioned in chrome-cobalt with circumferential arm clasp or bar clasp; the therapeutic prosthesis presented a percentage of 5.45% from the total.

Foram realizados testes de inserção e remoção de grampos a barra em “I", fundidos com liga de Cobalto-Cromo (CoCr) e com Titânio comercialmente puro (Ti). Foi utilizada uma máquina oscilante de teste para verificar o comportamento elástico destes grampos que atuaram sobre superfícies metálicas com graus de retenção de 0,25mm e 0,50mm. Dez grampos de CoCr e dez de Ti foram submetidos a 12.500 ciclos de teste (cada) sobre as superfícies metálicas. A ocorrência da deformação permanente dos grampos foi mensurada por meio de relógios comparadores colocados sobre as pontas dos retentores, sendo que a leitura destes relógios ocorreu a cada 500 ciclos. Os resultados desta pesquisa in vitro indicaram que, após os 12.500 ciclos, não foram observadas fraturas nos grampos. E ainda que os grampos feitos em liga de CoCr sofreram menores deformações permanentes do que os de Ti para ambas as retenções. / Insertion and removal trials of “I" bar clasps cast with cobalt-chromium alloy and commercially pure Titanium were carried out. An oscillating trial machine was utilized to verify the elastic behavior of these clasps, which acted on metallic surfaces with 0.25mm and 0.50mm degrees of retention. Ten CoCr clasps and ten Ti clasps were submitted to 12,500 trial cycles (each) on the metallic surfaces. The permanent deformation of the clasps was measured b y comparative gauges placed on the tips of the clasps, and the reading of the gauges was carried out every 500 cycles. The results of this in vitro research showed that after the 12,500 cycles clasp fractures were not observed and that clasps made with CoCr alloy suffered less permanent deformation than Ti ones for both degrees of retention.

<p>A well designed metal-based removable partial denture (MBRPD) is a cost-effective and a conservative method of rehabilitating a partially edentulous mouth. The MBRPD demands that the abbutment tooth provides support and/or retention while the abutment tooth, in turn, expects the MBRPD to transmit the forces axially and to be passive when fully seated. For vertical forces to be transmitted axially, occlusal rest seats have to be prepared on the abutment teeth to receive a cast metal rest of the MBRPD. The&nbsp / objective of this study was to compare occlusal rest seat preparations for metal-based removable partial dentures (MBPRD) prepared by dental students at the UWC Oral Health centres, to the corresponding cast metal rests and to determine action taken in response to discovered discrepancies between the rest seat preparation depth and the cast metal occlusal rset thickness.</p>

Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 115-138).

Foram realizados testes de inserção e remoção de grampos a barra em “I”, fundidos com liga de Cobalto-Cromo (CoCr) e com Titânio comercialmente puro (Ti). Foi utilizada uma máquina oscilante de teste para verificar o comportamento elástico destes grampos que atuaram sobre superfícies metálicas com graus de retenção de 0,25mm e 0,50mm. Dez grampos de CoCr e dez de Ti foram submetidos a 12.500 ciclos de teste (cada) sobre as superfícies metálicas. A ocorrência da deformação permanente dos grampos foi mensurada por meio de relógios comparadores colocados sobre as pontas dos retentores, sendo que a leitura destes relógios ocorreu a cada 500 ciclos. Os resultados desta pesquisa in vitro indicaram que, após os 12.500 ciclos, não foram observadas fraturas nos grampos. E ainda que os grampos feitos em liga de CoCr sofreram menores deformações permanentes do que os de Ti para ambas as retenções. / Insertion and removal trials of “I” bar clasps cast with cobalt-chromium alloy and commercially pure Titanium were carried out. An oscillating trial machine was utilized to verify the elastic behavior of these clasps, which acted on metallic surfaces with 0.25mm and 0.50mm degrees of retention. Ten CoCr clasps and ten Ti clasps were submitted to 12,500 trial cycles (each) on the metallic surfaces. The permanent deformation of the clasps was measured b y comparative gauges placed on the tips of the clasps, and the reading of the gauges was carried out every 500 cycles. The results of this in vitro research showed that after the 12,500 cycles clasp fractures were not observed and that clasps made with CoCr alloy suffered less permanent deformation than Ti ones for both degrees of retention.