Evaluation of dimensional stability of condensation of silicones according to their pouring time

Luiz Artur Zenni Lopes, Leonardo De Cezero, Roberto Makoto Suzuki

Abstract


Two commercial by available condensation silicones were evaluated for their dimensional stability at different pouring times. A master metallic model was developed simulating two teeth prepared for a fixed partial prosthesis with the same height and different diameters. This model was used to obtain 36 molds using the two-time shaping technique and 1-mm uniform relief on standard trays. The molds were divided into 6 groups (n=6) using: Zetaplus (Zermach) and Speedex (Vigodente) poured at 30 min; 36 h and 72h, respectively after molding. Then, they were poured with type IV dental stone (Polidental) being vacuum spatulated. Measurements over 3 distinct areas of each prepared tooth: mesiodistal and buccolingual diameters, cervico-occlusal height and the distances among them were made and registered. A three-dimensional gauging device (Zeiss) for 0.002-mm precision coordinates was use for the measurements. The results showed statistically significant differences in the smaller diameter mold height and in the distance among the teeth prepared (ANOVA; p<0.05) There were no statistically significant differences in all remaining areas measured for all silicone applied. From these results, we can conclude that all of the silicones tested showed a totally satisfactory dimensional behavior through all researching periods of time.

Keywords


Impression materials; Dimensional stability; Condensation silicones



DOI: https://doi.org/10.22456/2177-0018.2109

Licença Creative Commons

e-ISSN 2177-0018 / ISSN 0566-1854.

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