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Comparative evaluation of flow profile of commercially available vinyl polysiloxane impression materials - An
Midhila Madhusudanan1, Vidya K Shenoy1, Jalis A Khan1
1Department of Prosthodontics, AJ Institute of Dental Sciences, Affiliated to Rajiv Gandhi University of Health Sciences, Mangalore, Karnataka, India.
Background:
Flow characteristics of vinyl polysiloxane (VPS) impression materials are important determinants in the selection of impression materials for the fabrication of accurate indirect restorations.
Aims:
: The purpose of this study was to determine the flow of three commercially available VPS impression materials at different time intervals using a shark fin device (3M ESPE, Seefeld, Germany).
Study Setting And Design:
This in-vitro study was carried out at the prosthodontics department of a dental institution.
Methods And Material:
The height of the shark fin produced by each impression material determined the rate of flow.
Statistical Analysis:
The data were analysed using one-way analysis of variance (ANOVA) and post-hoc Tukey's test (p-0.05).
Results:
: Shark fin height of group A VPS impression material was significantly higher at 30 and 120 seconds compared to group B and group C VPS impression materials. Shark fin height produced by group B VPS impression materials at 60 and 90 seconds was significantly higher than the group C VPS impression material but non-significant compared to group A. At 120 seconds, there was no significant difference in the shark fin heights of all the tested materials.
Conclusion:
All the materials exhibited adequate flow characteristics within clinically acceptable limits.
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