Introduction.

They have been carried out in order to evaluate dimensional stability, a study group makes its own abutment in order to determine if there is no dimensional variation of the different impression materials used in oral rehabilitation. This variation will depend on different factors such as time, material, temperature, humidity among others.

Objective.

In this sense, the objective of the study was to evaluate the dimensional stability of the addition silicone / polyvinylsiloxane (VPS) and for this, time will be taken into account.

Methods.

We went on to an experimental study. The sample consisted of a total of 50 models, 25 for VPS and 25 for the control group whose material was silicone by condensation. To carry out the study, a master model was made taking into account 6 locations and 5 time periods where the first group at 0 minutes, the second group at 20 minutes, the third group at 1 hour, the fourth group at 6 hours and the fifth group at 24 hours, after the impression was taken.

Results.

After taking the impression when it is counted at 0 minutes, at 60 minutes, at 6 hours and at 24 hours, the statistic t ≥ 2.1318 and p≤ 0.05 is obtained, confirming that there are significant differences between the two silicones with respect to the dimensional variation.

Conclusions.

It is concluded that there is a variation in dimensional stability when compared with the control group such as silicone by condensation..

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