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KMID : 0988720090250010031
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2009 Volume.25 No. 1 p.31 ~ p.40
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Comparative Study of the Rheologic Properties of Elastic Impression Materials
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Hong Jun-Won
Park Ju-Mi
Song Kwang-Yeob
Ahn Seung-Geun
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Abstract
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The rheologic properties of elastic impression materials is a very important role as taking high accuracy impression. But, the studies that are focused on the rheologic properties of Korean elastic impression materials are not sufficient. The purpose of this study is to help clinical high accuracy impression taking by testing rheologic properties of elastic impression material that is made by Korea and other countries. Six type III elastic impression materials are tested. Subjects are 2 Korean polyvinylsiloxane(PVS), 2 imported PVS, 1 polyether, and 1 polysulfide. HAAKE RheoStress 1ⓡ(Thermo Electron Co. Germany)is used in measuring. HAAKE RheoStress 1ⓡ is plate to plate type rheometer. All subjects is tested 3 times and measuring time is 900 seconds. We measured G’ and loss tangent after mixing. All elastic impression materials had a sigmoid shape on increasing G’ by time and decreasing loss tangent after setting, maximum G’ is appeared highest in polyether, and lowest in polysulfide. Initial loss tangent is highest in polyether, and is lowest in Koreans PVS. Significant difference is showed in initial loss tangent between Korean PVS and imported PVS.
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KEYWORD
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dental impression material, elastic impression material, rheology, rheological property, Korean impression material
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