Examinando por Materia "Brackets metálicos"

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  • Miniatura
    ÍtemAcceso abierto
    Adhesive resistance against shear forces of metal brackets using different adhesive cements. In vitro study. Lima – Peru 2021
    (Universidad Privada Norbert Wiener, 2022-01-25) Yanac Calero, Darwin Newton; Chanamé Marín, Ann Rosemary
    One of the challenges in orthodontic treatment with braces is the installation and maintenance of fixed orthodontic appliances throughout the duration of the treatment. Therefore, the adhesive resistance to shear forces of metal brackets using different adhesive cements was determined. The research was experimental, cross-sectional, prospective, and comparative, where two types of cements were used: Orthocem and Heliosit, bonding to 20 dental pieces with their brackets. The laboratory mechanical procedure was then carried out using a universal testing machine, which applied vertical force at a rate of 1 mm/min until the brackets detached from the tooth, recording the data of this action. The adhesive resistance to shear forces of the metal brackets using the Orthocem adhesive cement was 2.592 ± 1.28 megapascals, and for the Heliosit adhesive cement, it was 2.437 ± 0.80 megapascals. The conclusion was that both Orthocem and Heliosit adhesive cements present similar adhesive resistance, with no statistically significant difference (p>0.05) to shear forces.
  • Miniatura
    ÍtemAcceso abierto
    Comparison of the shear resistance of metal and ceramic brackets using conventional or self-etching adhesive. In vitro study year 2021
    (Universidad Privada Norbert Wiener, 2021-11-01) Palacios Carpio, Keila Veronica; Gómez Carrión, Christian Esteban
    An in vitro study was conducted comparing the strength of metallic and ceramic brackets using two types of adhesive: conventional adhesive with acid etching of the surface and the latest-generation self-etching adhesive. The shear force resistance was measured in the laboratory. The results showed that metallic brackets bonded with conventional adhesive had better results than those bonded with self-etching adhesive, while ceramic brackets showed only a slight difference. The brackets bonded with self-etching adhesive showed a minimal difference compared to those bonded with conventional adhesive.