Effect of Gingival Retraction Materials on the Physical Properties of Polyvenyl Siloxane (PVS) Impression Material

Journal Article

Albaker, Abdulaziz M. . 2011

• Magazine \ Newspaper: Egyptian Dental Journal
• Volume Number: 57
• Pages: 899 - 905

Publication Abstract

Purpose: This was conducted to evaluate the effects of Expasyl and Hemox - A on the setting time and tear strength on polyvenyl siloxanes Impression materials. 
Materials and Method: 60 specimens of PVS impression materials were tested using Oscillating Rheometer to measure setting time; 20 specimens were contaminated with expasyl, another 20 specimens were contaminated with Hemox - A and 20 specimens were included as the control group. 60 specimens of PVS impression material were tested using Instron machine to measure tear strength. 
Result: A significant differance was observed in the setting time of PVS impression material when contaminated with Expasyl and Hemox - A.
Conclusion: Within the limitations of this study, it was noticed that the setting time and tear strength of PVS impression material was affected by the contamination with expasyl and Hemox - A.