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KMID : 0362419930310020207
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Journal of Korean Academy of Prosthodontics
1993 Volume.31 No. 2 p.207 ~ p.218
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The influence of impression materials on the accuracy of the stone casts poured from complete arch impression
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Lee Soo-Young
Chang Ik-Tae
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Abstract
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The purpose of this study was to evaluate the reproducing accuracy of stone casts made from complete arch impressions using different impression materials. The impression materials studied were 1) polyether, 2) polysulfide, 3) polyvinyl siloxane, and 4) irreversible hydrocolloid, Impressions were made from a partially edentulous acrylic resin model with metal inserts in canine, first molar region bilaterally and palatal vault region. Each distance between 2 out of 5 meauring points was measured by using 3 dimensional measuring machine. Impressions were poured at once with a type IV dental stone. Data were analyzed using t-test with a sample size six. @ES The results were as follows: @EN 1. Polysulfide and polyether were significantly supeior to polyvinyl siloxane and irreversible hydrocolloid in reproducing full arch model(p<0.05), but there were no statistical differences in amount of dimensional reproducing accuracy for full arch impression between polysulfide and polyether(p>0.05). There were statistical differences in amount of dimensional reproducing accuracy between edentulous area and tooth bound area for polysulfide and polyether(p<0.05), but no statistical differences were observed for polyvinyl siloxane and irreversible hydrocolloid(p>0.05).
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KEYWORD
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