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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.

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Authors
Vega Ruiz, Malú Ingrid
Advisors
Pagán Yábar, Luis Antonio
Issue Date
08/09/2014
Keywords
Impresión digital
Impresión de alginato
Dentral impression materials

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Publisher
Universidad Peruana de Ciencias Aplicadas (UPC)
URI
http://hdl.handle.net/10757/325981
Abstract
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.
La impresión dental es el procedimiento que más se realiza en la práctica clínica odontológica por lo que es indispensable realizarla de manera correcta para obtener un modelo definitivo óptimo. El propósito del presente estudio fue evaluar la alteración dimensional en modelos de yeso tipo IV obtenidos de impresiones con alginato, en las cuales la preparación empleó mayor o menor proporción de agua de lo que el fabricante refiere para la mezcla. El material utilizado fue alginato Tropicalgin de Zhermack®. Se realizó un modelo maestro de acero inoxidable, el cual simulaba una hemi-arcada con dos pilares. Se establecieron 3 grupos (Grupo1, Grupo control: 18 ml de agua y 9gr de polvo que corresponden a las proporciones indicadas por el fabricante, grupo 2: 13.5 ml de agua y 9 gr de polvo y grupo 3: 24 ml de agua y 9 gr de polvo). Se realizaron 15 impresiones por cada grupo que fueron vaciadas en yeso tipo IV Elite Rock de Zhermack®. Se realizaron 8 medidas a los modelos de yeso obtenidos de éstas impresiones mediante una máquina de medición por coordenadas con tecnología de Scanning por contacto modelo Contura G2 ZEISS para ser comparadas con las medidas del modelo maestro. Se hallaron diferencias estadísticamente significativas para las localizaciones E, F, G y H que corresponden a las medidas de las cimas y bases de los pilares.
Type
info:eu-repo/semantics/bachelorThesis
Rights
info:eu-repo/semantics/openAccess
Language
spa
Collections
Odontologia

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