Avaliação comparativa da alteração dimensional de diferentes materiais utilizados para a confecção de troquéis

• Ano de defesa: 2007
• Autor(a) principal: Fialho, Walter Luis Soares
• Orientador(a): Souza, Hilda Maria Montes Ribeiro de
• Banca de defesa: Sotelo, Laura Maria de Oliveira , Dias, Katia Regina Hostilio Cervantes , Vasconcellos, Adalberto Bastos de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Odontologia
• Departamento: Centro Biomédico::Faculdade de Odontologia
• País: BR
• Palavras-chave em Português: Resina epóxica; Silicona de adição; Gesso tipo IV; Modelo de trabalho; Troquel; Gesso - Modelos; Resinas epoxi - Modelos; Silicones - Modelos; Matrizes (Trabalhos em metal)
• Palavras-chave em Inglês: Epoxy resin; Vinyl polysiloxane; Gypsum type IV; Work model; Die
• Área do conhecimento CNPq: CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: http://www.bdtd.uerj.br/handle/1/14119

The aim of this study was to comparatively evaluate the dimensional changes of three different materials used in the production of dies: gypsum type IV - Fuji Rock (CG), industrial epoxy resin - Sikadur 32 (Sika) and epoxy resin - Tri-Epoxy Die Material (Tri-Dynamics). Two standard models of stainless steel have been made. One of these models was prepared to simulate a full crown preparation on a premolar. The other model was prepared 2.0 mm larger in all dimensions compared to the first one so as to provide an uniform relief for impression material mild base. Thirty dies have been made from molds in vinyl polysiloxane (Aquasil - Dentsply) using the two steps technique. Dies were divided into groups of ten for each material. Changes were evaluated by measuring the height and diameter of bottom and top of the dies with the aid of a Deltronic DV-114 Profiles Projector with reading software. The resultant measurements were arranged into tables and statistically analyzed. After evaluation, it was concluded that there was a statistically significant difference among all tested groups. Gypsum Fuji Rock type IV (GC) dies shrank in top s height and diameter measurements, and expanded the bottom diameter measurements, showing statistically significant differences when compared to control group (metal). Epoxy resin Epoxy-Tri (Tri-Dynamics) dies shrank in top s height and diameter and expanded in bottom diameter measurements, showing statistically significant difference only in top s diameter when compared to control group (metal). Epoxy resin Sikadur 32 (Sika) dies shrank in top s height and diameter measurements and expanded in bottom s diameter measurements, showing a statistically significant difference when comparing to control group (metal).