Effect of Storage Time and Temperature on Dimensional Stability of Impressions Made with Zinc Oxide Impression Paste

Karanveer Singh; Reena Luthra; Mohammad Arif Lone; Ramanpreet Ranauta

Volume : VIII, Issue : V, May - 2019

Effect of Storage Time and Temperature on Dimensional Stability of Impressions Made with Zinc Oxide Impression Paste

Karanveer Singh, Reena Luthra, Mohammad Arif Lone, Ramanpreet Ranauta

Abstract :

This study was aimed to assess the effect of storage time and temperature or dimensional stacility of impression made with cavex outline zinc oxide impression paste Material and methods : A round stainless steel mould with five grooves( 3 horizontal and 2 vertical) was used in this in vitro experiment study.cavex impression paste was prepared and applied to the mold.the mold was placed on a block and stored at 35 0c and 100% humidity for setting.the impression were then poured with stone immediately and after 30,120,240 and 420 minutes and 24 hours .the distance between the vertical lines on the cast was measured and compared with that in the immediately poured cast. Results: Storage in a refrigerator and at room temperature for zero to seven hours had no significant effect on dimensional stability of the impressions; however, 24 hours of storage in a refrigerator or at room temperature decreased the dimensional stability of Cavex Outline (P=0.001). Also, a significant association was found between dimensional changes following 24 hours of storage in a refrigerator (4�C) and at room temperature (23�C; P<0.01). Conclusions: The optimal pouring time of Cavex Outline impressions with stone is between zero to seven hours, and 24 hours of storage significantly decreases the dimensional stability. Keywords: Dental Impression Materials; Zinc Oxide; Cavex 