Resumo

FONTE-BOA, Juliene C et al. Condensation silicones: do new materials really presents better dimensional stability?. Acta odontol. latinoam. [online]. 2011, vol.24, n.1, pp.61-65. ISSN 1852-4834.

The aim of this study was evaluate the dimensional stability of some condensation silicones. The following materials were studied: Coltex/ColtoflaxR - Coltene, SpeedexR - Coltene, and Optosil Comfort/Xantopren VL PlusR - Kulzer. They were evaluated by dimensional analysis and gas chromatography (GC) performed at the following times: T0, T1, T2, T3, T4, and T5 (immediately after setting, thirty minutes, two hours, twenty four hours, seventy two hours, and seven days after setting, respectively). The dimensional changes were measured directly in the molds using a Mitutoyo microscope. The ColtexR fine/ColtoflaxR and OptosilR Comfort/XantoprenR VL Plus materials presented dimensional stability for up to thirty minutes after molding, while the SpeedexR material remained stable for up to two hours after molding. The gas chromatography experiment demonstrated that these materials release ethanol even after clinical setting.

Palavras-chave : Dental Impression Materials; Polydimethylsiloxane; Gas Chromatography.

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