Abstract
Objectives :The aim of this in-vitro study was to compare the accuracy of dies generated from metal and plastic dual arch trays impressions using two different viscosities of polyvinyl siloxane impression material and comparing the results to that obtained using a conventional full arch custom impression technique. Materials and method: Seven set of impressions were made of an experiment model using different combinations of, dual arch trays and viscosities of impression materials and the dimensions of the dies thus obtained were compared with those obtained from conventional full arch custom arch tray and medium viscosity impression material. Results: The gypsum dies prepared, from the complete arch custom tray technique and the dual arch impression technique using plastic and metal dual arch trays were generally larger in bucco-lingual dimension and shorter in mesio-distal dimension. Conclusions: All the seven types of impression techniques produced clinically successful impressions of standard brass die and dies so developed were within clinical standards to produced clinically successful restorations.
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