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§ 1. Addition vs Condensation Silicone Chemistry
Older condensation silicones release ethanol as a setting byproduct, causing continuous shrinkage over 24 hours. Addition-cure vinyl polysiloxanes (VPS) set via platinum-catalyzed addition polymerization with zero volatile byproducts, delivering dimensional stability (<0.20% change) for up to two weeks.
§ 2. Thixotropy and Hydrophilic Contact Angle
Sulcular fluid and blood can create bubble voids in hydrophobic impression materials. Evenmed Light Body incorporates non-ionic surfactants that reduce contact angle, allowing the wash to flow into deep subgingival margins under light pressure while remaining stable on preparation walls.
§ 3. The Two-Step vs One-Step Putty/Wash Technique
The two-step technique (pre-cutting escape channels in the set putty) relieves hydraulic pressure and guarantees an even wash layer. The one-step technique seats both materials simultaneously to save time while maintaining high accuracy.
