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• W337625105 abstract "The effect of storage time on dimensional accuracy of elastomeric impression materials. M.A. Osio M.Sc (Dent) mini thesis, Department of Restorative Dentistry, Faculty of Dentistry, University of the Western Cape Several factors play a role in stability of impressions made from elastomeric impression materials. These include; polymerization shrinkage, loss of by-products during condensation, thermal contraction from oral temperature to room temperature, imbibition when exposed to water, disinfectant or high humidity and incomplete recovery from deformation due to viscoelastic behavior. An ideal impression material should be dimensionally stable over time to allow for pour at the convenience of the operator. Several studies evaluated the dimensional accuracy of elastomeric impression materials based on various factors including effects of repeat pour, temperature, humidity, disinfectants, impression techniques, and filler loading amongst others. Most of the previous studies did not use the standardized method described by the ADA specification for elastomeric impression materials. Title: The effect of storage time on dimensional accuracy of elastomeric impression materials. Aim and Objectives: The objective of this study was to investigate indirectly on stone casts the long-term dimensional accuracy of standardized impressions of a stainless steel master die taken with selected elastomeric impression materials when the impressions are stored at the same environmental humidity and temperature and poured at different storage times of 0, 3 , 5 and 7 days respectively. Materials and methods: A total of 60 impressions of a standardized stainless steel die similar to that specified by ADA specification number 19 were recorded. The materials tested included Impregum, Permadyne-Impregum combination, and President. 20 impressions were taken per material combination. The baseline measurements were made on the casts poured from the 0 days storage experimental group impressions using a traveling microscope accurate to 0.01mm. Subsequent readings were taken from models after 3, 5 and 7 days of delayed pour respectively. Results: The results were analyzed using the Wilcoxon Signed Rank Sum test, Kruskal Wallis test and Chi square test." @default.
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• W337625105 date "2008-01-01" @default.
• W337625105 modified "2023-09-27" @default.
• W337625105 title "The effect of storage time on dimensional accuracy of elastomeric impression materials" @default.
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