Abstract
The aim of study is to evaluate the linear dimensional changes (cross arch, antero–posterior dimensions) of imp-ressions and die stone casts of two brands of addition silicone impression materials (Express and President) for special master model using two–steps (putty–wash) tech-nique, 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 dist-ances of impression and die stone casts. The Express impression materials produce the most accurate results. There is slightly increase in inter-abutment 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.
Highlights
The accurate replication of teeth and their arch position requires impression materials that exhibit limited distortion.[1]
In the recent years three–dimensional measurement has been done to analyze precisely the distortion of impressions and stone casts.[11,12,13] The p/w impression technique was originally recommended to overcome the problems associated with polymerization shrinkage of elastomeric impression materials
Means and standard deviation of linear measurements of impressions, stone casts and master model are presented in Tables [1] and [2]
Summary
The accurate replication of teeth and their arch position requires impression materials that exhibit limited distortion.[1]. In the recent years three–dimensional measurement has been done to analyze precisely the distortion of impressions and stone casts.[11,12,13] The p/w impression technique was originally recommended to overcome the problems associated with polymerization shrinkage of elastomeric impression materials. The advantage of this technique is that the impression of teeth and edentulous areas can be captured with the wash materials.[14,15,16]. The test apparatus with impression was placed in an incubator during the setting time of impression at 37 + 1 oC under constant pressure at each corner of upper part of test apparatus
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