The accurate duplicate cast obtained froma single impression reduces the profession clinical time, patient inconvenience, and extra\nmaterial cost. The stainless steel working cast model assembly consisting of two abutments and one pontic area was fabricated. Two\nsets of six each customaluminumtrayswere fabricated, with fivemmspacer and twommspacer.The impressionmethods evaluated\nduring the study were additional silicone putty reline (two steps), heavy-light body (one step), monophase (one step), and polyether\n(one step). Type IV gypsum casts were poured at the interval of one hour, 12 hours, 24 hours, and 48 hours. The resultant cast was\nmeasured with traveling microscope for the comparative dimensional accuracy. The data obtained were subjected to Analysis of\nVariance test at significance level <0.05. The die obtained from two-step putty reline impression techniques had the percentage of\nvariation for the height âË?â??0.36 to âË?â??0.97%, while diameter was increased by 0.40ââ?¬â??0.90%. The values for one-step heavy-light body\nimpression dies, additional silicone monophase impressions, and polyether were âË?â??0.73 to âË?â??1.21%, âË?â??1.34%, and âË?â??1.46% for the height\nand 0.50ââ?¬â??0.80%, 1.20%, and âË?â??1.30% for the width, respectively.
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