Examinando por Materia "Postes de fibra de vidrio"

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Acceso abierto
Fatigue resistance of exact fiberglass posts - angelus, white post, angelus reforpost, in vitro study – Lima 2020.
(Universidad Privada Norbert Wiener, 2020-12-19) Dilas Teran, Santos; Chanamé Marín, Ann Rosemary
The objective of this study was to determine the best fatigue resistance of the fiberglass posts Exacto - Angelus, White Post, and Reforpost by Ángelus in an in vitro study. Each post was evaluated using an optical microscope and measured in length and diameter with a 200 mm digital vernier caliper. A total of 60 fiberglass posts were divided into three groups: Group 1: Exacto – Angelus, Group 2: White Post, and Group 3: Reforpost by Angelus. These were then subjected to a linear cyclic load fatigue machine HTL Certificate – 021 with a 1.6 mm diameter punch, a free span of 7 mm, applying a load at 90° and a frequency of 5.84 Hz at 20 N. The results showed that the Exacto – Angelus fiberglass post achieved an average fatigue resistance of 38,692.5 cycles with a mean time of 110.55 minutes, while the White Post had an average fatigue resistance of 31,921.25 cycles with a time of 91.225 minutes, and the Reforpost by Angelus had an average fatigue resistance of 25,970 cycles at 74.2 minutes. It was concluded that the Exacto – Angelus post showed the highest fatigue resistance time.
Acceso abierto
Flexural resistance in fiberglass poles with different structural form, in vitro - Lima study 2021
(Universidad Privada Norbert Wiener, 2023-06-21) Vilca Huallpa, Dayana Pamela; Guevara Sotomayor, Juan César
The objective of this research was to compare the flexural strength between the fiberglass posts White Post DC - Fgm #0.5, Reforpost - Angelus #1, and Endodontic Over Post - Over Fibers #1, in an in vitro study conducted in Lima, 2021. This was a descriptive study with a quantitative approach, experimental design, and a cross-sectional comparative approach. The sample consisted of 30 fiberglass posts, divided into three groups of 10 units each: group 1: Reforpost, group 2: Whitepost, and group 3: Over Post. The posts were digitally calibrated according to ISO 14125 standards, and flexural strength tests were performed using the Microtensile OM100 semi-universal testing machine at a crosshead speed of 0.8mm/min and a load angle of 90°. The results showed that the average flexural strength of the Whitepost - FGM fiberglass was 758.45 Mpa, Reforpost - Angelus fiberglass was 1066.26 Mpa, and Over Post - Over Fibers fiberglass was 961.82 Mpa, with a p-value > 0.05. Conclusion: Comparing the flexural strength of the fiberglass posts White Post DC - Fgm #0.5, Reforpost - Angelus #1, and Endodontic Over Post - Over Fibers #1 provides sufficient statistical evidence to conclude that they are different. It is noteworthy that Reforpost fiberglass had the highest flexural strength.