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- Title
Comparative Evaluation of Dimensional Accuracy of Addition Silicone and Condensation Silicone Impression Materials - An in-vitro Study.
- Authors
Joshi, Pramod Raj; Bhrat, G. Sudhrakara; Shrenoy, Vidya
- Abstract
The dimensional accuracy and stability of two addition-cured silicones (Reprosil, Dentsply/ Caulk, USA and Express XT, 3M ESPE, Germany) and two condensation-cured silicones (Speedex, Coltene Whaledent, USA and Zetaplus, Zhermack, Italy) were evaluated. A stainless steel master die simulating a three unit fixed partial denture preparation was fabricated. For each brand of the impression material, 6 impressions were made and cast poured immediately. The impressions were repeatedly poured at 1 h, 24 h, 48 h and 16 8 h. Inter-preparation dimension and occlusogingival dimension were measured in the recovered stone dies (Type IV, Kalrock) using a travelling microscope calibrated to an accuracy of 0.001 cm. Results indicated that i) the addition silicone impression materials were superior in accuracy and dimensional stability in comparison to condensation silicone; ii) at 1 hour of pour, all the materials tested seemed to have comparable accuracy and dimensional stability; iii) the gypsum dies produced from the successive pours of all the tested impression materials were generally larger in inter-preparation distance and smaller in occlusogingival dimension than the stainless steel master die, with the addition silicone demonstrating the smallest change. From the findings of this study, it can be concluded that addition silicones used in this study have better dimensional accuracy and stability than condensation silicones. An impression made from condensation silicone should be poured as soon as possible.
- Publication
Malaysian Dental Journal, 2009, Vol 30, Issue 1, p34
- ISSN
0126-8023
- Publication type
Academic Journal