Laboratory Evaluation of Dimensional Changes of Different Elastomeric Impression Materials Using 3D Laser Scanner

Aim of the work To evaluate and compare the dimensional changes of three different elastomeric impression materials after poured at different time intervals by using three-dimensional (3D) laser scanner and image software program. Materials and methods The 3 groups of elastomeric impression materials used. The 45 Impressions, 15 with vinylpolysiloxane, 15 with polyether and 15 with vinylsiloxanether, of typodont model, poured in Type IV stone after1 hour, 1 day and 1 week. The model and casts were digitised by three-dimensional (3D) laser scanner. Premium software superimposed a standard model with the master casts and the difference between the images analyses. Results and Conclusions All reference points on the master casts obtained from all elastomeric impression materials after one hour and one day showed little changes than the standard model. Concerning the time intervals for pouring the elastomeric impression materials. Both polyether and vinylsiloxanether showed significant changes of difference points after one week of pouring the impressions. The vinylpolysiloxane impression material doesnt showed these changes after one week which means that its dimensional stable than the other one.