Comparación in vitro de los cambios dimensionales de modelos con yeso tipo IV en relación a la proporción polvo-líquido para la preparación del alginato.

• Autor: Vega Ruiz, Malú Ingrid
• Formato: tesis de grado
• Fecha de Publicación: 2014
• Institución: Universidad Peruana de Ciencias Aplicadas
• Repositorio: UPC-Institucional
• Lenguaje: español
• OAI Identifier: oai:repositorioacademico.upc.edu.pe:10757/325981
• Enlace del recurso: http://hdl.handle.net/10757/325981
• Nivel de acceso: acceso abierto
• Materia: Impresión digital; Impresión de alginato; Dentral impression materials

The dental impression is the most widely performed procedure at clinical dentistry in order to obtain an optimal final model. The aim of this study was evaluate the dimensional changes in type IV gypsum models obtained by alginate impressions; this alginate was mixed with different proportions of water (18 ml, 13.5 ml and 24 ml). The alginate used in the study was Tropicalgin by Zhermack® . A stainless steel master model was constructed, which simulated a hemi-arch and two pillars. 3 groups were assigned (group 1, the control group: 18 ml of water and 9 gr of powder which corresponds with the manufacturer’s specifications, group 2: 13.5 ml of water and 9 gr of powder and group 3: 24 ml of water and 9 gr of powder). 15 impressions were made for each corresponding group and were cast into type IV gypsum models using Elite Rock by Zhermack® . 8 measurements were taken of each of the gypsum models and compared with the master model using coordinate measuring scanning technology provided by the Contura G2 Zeiss. In the locations E, F, G and H, which corresponded with measurements from the base to the top of the pillars, statistically significant differences were observed.