Examinando por Materia "Roughness"

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Acceso abierto
Comparison of dimensional changes and roughness between two marks of conventional alginates and two marks of alginates with silicone particles according to elapsed time
(Universidad Privada Norbert Wiener, 2023-10-13) Florez Gonzales, Maribel; Morante Maturana, Sara Angelica
The objective of this study was to compare the dimensional change and roughness between two brands of conventional alginates and two brands of silicone particle alginates over time. The methodology used in this study was experimental, prospective, longitudinal, and quantitative. The sample consisted of 60 models of impressions taken with conventional alginates Zetalgin and Hygedent and silicone particle alginates Neocolloid and Hygedent 100. For each group of alginates, 5, 15, and 30 minutes post-impression were considered for the corresponding pouring. A master model was used for all impressions to achieve homogeneous samples. After the impressions were taken, they were measured using a digital caliper for greater accuracy and a digital profilometer. A data collection sheet was used as the instrument, employing the observation technique. The Shapiro-Wilk test was used, followed by the Mann-Whitney U test and Student's t-test to determine if there were differences in dimensional stability and roughness. The results showed that regarding dimensional changes over time, no significant differences were found at 5 and 15 minutes (p > 0.05), but significant differences were found at 30 minutes (p < 0.05). Regarding roughness over time, no significant differences were found at 5, 15, and 30 minutes (p > 0.05).
Acceso abierto
Comparison of the roughness and compressive strength of type IV plasters subjected to manual and non-manual vibration according to time variation in vitro 2022
(Universidad Privada Norbert Wiener, 2023-07-07) Sanchez Veramendi, Yoselina; Morante Maturana, Sara Angelica
The purpose of this research was to compare the roughness and compression resistance of Type IV plasters subjected to manual and non-manual vibration, according to time variation. The study employed an applied methodology with an experimental, cross-sectional, prospective, and comparative design. The population consisted of two Type IV plasters subjected to manual and non-manual vibration, with a total of 120 plaster blocks from both brands. The sample consisted of 60 sample units for each commercial brand, subdivided into two groups of 30 units each, with 15 units measured at 30 minutes and 15 units at 60 minutes for compression and roughness measurements, respectively. A non-probabilistic convenience sampling was used according to the researcher's criteria. Two data collection forms were used: one for measuring compression resistance and another for measuring roughness, with the plasters used being Fujirock and Elite Rock. Results: Significant differences were observed when comparing the roughness between Elite Rock Type IV plaster and Fujirock, with a p-value of 0.001 (p < 0.05), and also in compression between Elite Rock Type IV plaster and Fujirock, with a p-value of 0.000 (p < 0.05).