A Comparative Study on the Effect of Disinfection on the Wettability and Gypsum Castability of Vinyl Poly Siloxane Ether and Vinyl Poly Siloxane Impression Materials

From standard dies, ‘Reline technique’ was used with two impression materials viz., Vinyl Poly Siloxane [VPS] and Vinly Poly Siloxane Ether [VPES] of heavy and light body consistencies with a custom tray and a standardized pressure. 60 smooth surface disc specimens comprise Group I and 60 cross hatched surface comprise Group II. First group is subjected to standard disinfection protocol with 3.5 % Gluteraldehyde. The specimens were tested for wettability using Digidrop GX Goniometer for the contact angle with disinfection and after surfactant. Casts were poured from the second group and analysed for the number of voids, in the Image software with 150X magnification. The study concluded that VPES was most hydrophilic attributing to its better castability than VPS by virtue of less number of voids. In all the specimens, Wettability of materials was found to reduce on disinfection. The application of surfactant (Debubilizer, Delta) was found to increase the wettability for both VPS and VPES material and a positive correlation was seen between the contact angle values and resultant number of voids in gypsum casts.

Resources Used:

Equipments: Goniometer – Digidrop GX, Image software – IIT, Chennai

Materials: VPES -GC Exallance, VPS -GC Exaflex, Surfactant –Debubbliser,Delta, Gluteraldehyde – Prime Dental