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Cross arch and antero–posterior dimensional changes of impressions and stone casts at different storage times

Author: Sawsan H Al–Jubori
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2003 Volume: 3 Issue: 1 Pages: 74-81
Publisher: Mosul University جامعة الموصل

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Abstract

The aim of study is to evaluate the linear dimensional changes (cross arch, antero–posterior dimensions) of impressions and die stone casts of two brands of addition silicone impression materials (Express and President) for special master model using two–steps (putty–wash) technique, at different storage times before pouring of impression, by using of three dimensional measuring machine and to compare between the accuracy of the two brands of impression materials. The results indicated that a significant difference between the interabutment distances of impression and die stone casts. The Express impression materials produce the most accurate results. There is slightly increase in interabutment distances of stone casts. At one hour storage time there are the smallest dimensional changes of impressions and stone casts in relation to construction of complete–arch fixed partial denture.

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