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).

Light transmission through porcelain.

Objective: This study evaluates the effect of shade and thickness of porcelain in light transmission.

Methods: One hundred and twenty-eight disks of Duceram porcelain were made to combine four different thicknesses (1.5; 2.