Examinando por Materia "Pouring time"

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In vitro study of the dimensional stability in models using condensation silicone according to emptying times
(Universidad Privada Norbert Wiener, 2023-01-17) Narvaez Alvarado, Elizabeth Cristina; Vásquez Rodrigo, Hernán
The objective of this research was to compare in vitro the dimensional stability of impressions made with condensation silicone on plaster models using three spaced pouring times, based on a stainless steel master model. This is an experimental study in which 30 impressions were made on a stainless steel master model using Speedex Putty condensation silicone, and they were divided into 3 groups: 10 impressions at 30 minutes, 10 impressions at 60 minutes, and 10 impressions at 24 hours. To assess dimensional stability, a specialized coordinate machine, Duramax 5/5/5 with ZEISS (Germany) contact scanning technology, was used to measure 6 locations (A, B, C, D, E, and Angle measurement). The results showed, through ANOVA statistical analysis, that there were significant differences between the pouring times of 30 minutes and 24 hours in measurements A, B, and the Angle measurement. In conclusion, it was demonstrated that there is less dimensional alteration in definitive plaster models poured at 30 minutes, as evidenced by Measurements C, D, E, and the Angle measurement. Regarding the 60-minute pouring time, greater dimensional stability was found only in Measurements A and B. On the other hand, the 24-hour pouring time showed the greatest dimensional variation compared to the 30 and 60-minute pouring times.