Comparative evaluation of the accuracy of pick up transfer impressions performed with two different types of trays

Resumo

The success of implant-supported prostheses is related to
the passive union between the prostheses’ connections and the implants,
so it is necessary to obtain an accurate working cast. Objective: To
evaluate the accuracy of the transfer impressions of implants performed
with individual acrylic resin trays and conventional trays using polyvinyl
siloxane. Material and methods: To carry out the transfer impressions,
a master cast with four external hexagon implants parallel to each
other was used. Five impressions were made with individual acrylic
resin trays and five other impressions with modified conventional
trays, opened in the region of the implants. The linear measurements
between the implants were made with a digital caliper with an accuracy
of 0.01 mm and the results were statistically evaluated �(alpha = 5%)�.
Results: For the points AB and BC, the measurements obtained
with the individual trays were statistically similar to the master cast.
For the points CD and DA no statistical differences among the three
groups were observed. Conclusion: Given the obtained results and the
methodology used, it can be concluded that the impressions performed
with individual trays presented higher accuracy compared to the ones
obtained with conventional trays.