Examinando por Materia "Dimensional stability"

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Acceso abierto
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.
Acceso abierto
Relationship of workload and self-perception of oral health in nursing graduates on the front line of Covid-19 care in Metropolitan Lima, 2021
(Universidad Privada Norbert Wiener, 2022-11-15) Palomino Requena, Roberto Ruben; Vásquez Rodrigo, Hernán
The objective of this research is to compare in vitro the dimensional stability of impressions made with condensation silicone on plaster models using three spaced pouring times, based on a master model made of stainless steel. This is an experimental study, where 30 impressions were made on a stainless steel master model using Speedex Putty condensation silicone, divided into 3 groups according to pouring times: 10 impressions at 30 minutes, 10 impressions at 60 minutes, and 10 impressions at 24 hours. To establish dimensional stability, a Duramax 5/5/5 coordinate machine with ZEISS (Germany) contact scanning technology was used, where six locations (A, B, C, D, E, and Angle measurement) were measured. Statistical analysis using ANOVA showed 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 models poured in plaster at 30 minutes, as evidenced by Measurements C, D, E, and the Angle measurement. In relation to the pouring time of 60 minutes, greater dimensional stability was only found 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.