<![CDATA[Background: The accuracy and dimensional stability of dental impression materials are of great importance,since a material which shrinks, expands or warps during or after removal from the mouth will result in aninaccurate model and potentially, a badly-fitting prosthesis. The purpose of this study was to evaluate thedimensional accuracy of the impression materials immediately after setting and also to determine the changein dimensional accuracy after 24 hours.Materials and Method: Four impression materials were selected among which two were hydrocolloidsand two were elastomers. Fifteen samples of each were experimentally tested immediately and 24 hoursafter sample preparation. Data obtained were subjected to t-test and analysis of variance for statisticalcomparisons at a 5% level of significance.Results: The linear difference in measurements were recorded immediately and 24 hours after setting.The changes in dimensional accuracy with respect to time were statistically analysed and it showed nostatistically significant difference between the materials both immediately and after 24 hours.Conclusion: Within the limitations of the study,It can be concluded that there were similar results for dimensional accuracy for all the materials testedimmediately after sample preparation but there was considerable disparity with the same tested after 24 hrsfor hydrocolloids and not much of difference was noted for elastomers.]]>
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