Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.4322/polimeros.2013.012
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Influence of Elastic Recovery Time on Dimensional Stability of Polydimethylsiloxane (PDS)

Cesero, Leonardo de; Nogarett, Ligia Maria; Fracasso, Lisiane Martins; Araujo, Carlos dos Reis P. de

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Abstract

The aim of this study was determine the influence of recovering time on the dimensional stability of polydimethylsiloxane (Speedex, Coltène/Whaledent Company, Altstätten, Switzerland) prior to type IV dental stone pouring. The double impression technique was utilized with uniform spacing of 1 mm for the wash paste, at 30 minutes, 24 hours and 72 hours after making the impression using an individual perforated metal tray. After the preparation of the impressions, six stone models were made by the standard procedure for all the impressions. The dimensional alterations (mm) of the models obtained were submitted to analysis of variance (ANOVA) and Tukey’s test (α=0.05). No statistically significant difference between the three groups (30 minutes, 24 hours and 72 hours) were recorded to both height and diameter of the preparation. However, on comparing the results of the three groups with the metal standard model, there was a significant difference between group 1 (30 min) in relation to the diameter of standard metal die (p=0,047). The condensation silicone Speedex shows satisfactory dimensional stability, where dental stone models can be poured with assurance up to 72 hours after preparation of the impression.

Keywords

Dental materials, dental impression materials, elastomers

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