To compare the dimensional accuracy of dies obtained by using different tray materials – An in vitro study

Abstract Introduction: This in-vitro study was undertaken to compare the dimensional accuracy of dies obtained by using different tray materials and pouring casts at different time intervals. Objectives 1. To compare the dimensional accuracy of dies obtained from auto polymerizing acrylic resin custom tray from the metal die model. 2. To compare the dimensional accuracy of dies obtained from light cure acrylic resin custom tray from the metal die model. 3. To compare the dimensional accuracy of dies obtained from metal stock tray from the metal die model. 4. To compare the dimensional accuracy of dies obtained from plastic stock tray from the metal die model. 5. To compare dimensional accuracy of dies obtained from all tray materials poured at different time intervals that is at immediate pouring, 24 hours and 72 hours amongst each other. Materials and Methods: Vinyl polysiloxane in putty and light body consistency were used for making impressions. A stainless steel die with specific dimensions was used for making the samples. Two indentations were made on the top and lateral side of the die. Total 12 groups were made using each type of tray at immediate, 24 hrs and 72 hrs time interval. 120 samples were fabricated ten per group. Three readings were recorded for each sample and average of the three were compared amongst themselves. Linear measurements were done using profile projector. Data was collected and analysed statistically. Results: Based on the study it can be concluded that dimensional accuracy was comparable at immediate pouring with different tray materials as the horizontal and vertical distance was found to be statistically non- significant. However, on comparison of horizontal and vertical distance at 24 hr and 72 hr it was found that result of dimensional accuracy was best for light cure tray followed by custom tray, stock metal tray and stock plastic tray.