Condensation silicones: do new materials really presents better dimensional stability?
The aim of this study was evaluate the dimensional stability of some condensation silicones. The following materials were studied: Coltex/Coltoflax - Coltène, Speedex - Coltène, and Optosil Comfort/Xantopren VL Plus - 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 Coltex fine/Coltoflax and Optosil Comfort/Xantopren VL Plus materials presented dimensional stability for up to thirty minutes after molding, while the Speedex material remained stable for up to two hours after molding. The gas chromatography experiment demonstrated that these materials release ethanol even after clinical setting.
Department of Restorative Dentistry, School of Dentistry, Minas Gerais Federal University, Belo Horizonte, Brazil. jufonteboa@uol.com.br
Juliene C
JC
Fonte-Boa
João Maurício L F
JM
Mota
Luiz Thadeu A
LT
Poletto
Maria Carmen F S
MC
Carvalho
Maria Esperanza
ME
Cortés
Rubén D
RD
Sinisterra
Sophia F
SF
Leal
D003760:Dental Impression Materials; D008422:Materials Testing; D012828:Silicones
D003760:Dental Impression Materials; D012828:Silicones