As opposed to VPS, polyether impression material due to its functional groups is highly hydrophilic.
It is also revealed that plasma treatment has good effect on the wettability of VPS whereas it did not have the desired effects on polyether impression materials.20,22
This was followed by final preparation and final impression with polyether impression material (Impregum and Perma- dyne) (3M Espe-Seefeld-Germany) of the upper and lower arches.
Fixation Impression of the lower jaw with the primary telescopic crowns in mouth using polyether impression material (Impregum and Permadyne) was done.
Moller, B (1990) Guinea pig maximization test with a polyether impression material
. Scand Res 98(4): 356-62.
On the other hand Polyether impression materials are hydrophilic and stable materials but they are quite expensive, bitter in taste and have high elastic modulus.18 A new elastomeric impression material, Vinylsiloxanether was introduced in early 2009 which combines the countenance of addition silicone and polyether impression material.
Jacob et al noticed expansion of polyether impression material under dry condition.32 Where as Walker et al found no expansion of polyether impressions under moist condition.33 Therefore Jacob et al concluded that expansion of polyether impression material appeared to be material dependent, i.e.
The influence of the mixing technique on the content of voids in two polyether impression materials
. Schweiz Monatsschr Zahnmed.
They also demonstrated that polysulphide impression materials had much longer working time (4 to 6 minutes) and setting time (12 to 16 minutes) at 23C and 37C respectively, compared to vinyl polysiloxane (VPS), condensation silicone and polyether impression materials.
Wettability of silicone and polyether impression materials: Characterization by surface tension and contact angle measurements.