CONSISTENCY MEASUREMENTS OF THREE COMMERCIAL AND FIVE NOVEL EXPERIMENTAL VINYL POLYSILOXANE (VPS) IMPRESSION MATERIALS
The purpose of this study was to develop a medium bodied hydrophobic and hydrophilic experimental (Exp) vinyl polysiloxane (VPS) impression materials (ab initio) incorporating a novel cross-linking agent, tetra-functional (dimethylsilylorthosilicate (TFDMSOS) and a non-ionic surfactant, Rhodasurf CET-2, (ethoxylatedcetyl-oleyl alcohol), and to analyse their effects on consistency measurements and to compare it with commercial medium bodied VPS impression materials.
Five experimental formulations (Exp-I, II, III, IV and V) of VPS impression materials were developed. Three commercial VPS (Aquasil Ultra Monophase, Elite HD Monophase and Extrude) were used. The consistency measurements of five Exp materials were compared with each other and with three commercial VPS impression materials. The results were analysed with one-way ANOVA and post hoc Tukey’s test using the SPSS PASW statistical 22 software.
The consistency measurements of the three brands of commercial VPS impression materials and Exp-I and II were not significantly different (p˃0.05) from each other. The surfactant modified Exp VPS (Exp-III, IV and V) showed significantly lower consistency values than their controls (Exp-I and II) and all commercial products. It was also observed that by increasing the amount of the surfactant (Rhodasurf CET-2) there was a consistent decrease in the consistency for the experimental hydrophilic VPS (Exp-III, 31.20±0.78 mm; Exp-IV, 32.00±0.54; Exp-V, 31.00±0.62 mm) but these were not significant. The results for the average consistency measurements of all experimental materials prepared in the current study fulfil the criteria of ISO4823 for elastomeric impression materials for a medium-bodied impression material.