Effect of different impression materials and techniques on the dimensional accuracy.
Different factors such as impression techniques can affect the passive fit between the superstructure and implant.
Ebadian and et al has studied effect of different impression materials and techniques on the dimensional accuracy of implant definitive casts.
Four internal hex implants (Biohorizons Ø4 mm) were placed on a metal maxillary model perpendicular to the horizontal plane in maxillary lateral incisors.Three impression techniques including open tray, closed tray using ball top screw abutments and closed tray using short impression copings and two impression materials (polyether and polyvinyl siloxane) were evaluated (n = 60).
In conclusion, there was no difference between open and closed tray impression techniques; however, less distortion and deviation were observed in the open tray technique. In the closed tray impression technique, ball top screw was more accurate than short impression copings.
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