Examinando por Materia "Fixed prosthesis"

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  • Miniatura
    ÍtemAcceso abierto
    Effectiveness in the adhesion of three types of composite resins as an alternative for the repair of porcelain in fixed prostheses: a comparative in vitro study, Lima 2019
    (Universidad Privada Norbert Wiener, 2019-11-06) Guzmán Lavado, Ivan Erasmo; Girano Castaños, Jorge Alberto
    Oral rehabilitation in fixed prosthesis treatments with metal-ceramic materials is widely used today, but these materials can fracture due to multiple factors. However, this situation does not always lead to replacement. Repairing porcelain with composite resin is an alternative with advantages such as easy handling and low cost. The main objective of this thesis was to determine the effectiveness of adhesion of three types of composite resins used as alternatives for repairing porcelain in fixed prostheses in Lima, 2019. This study was experimental, analytical, prospective, and cross-sectional. Feldspathic ceramic IPS CLASSIC V was used as the base material to evaluate the adhesion of three types of composite resins: Master Fill resin, Tetric N-Ceram resin, and Filtek Z350 XT resin. The microtensile bond strength (μTBS) was evaluated using a digital universal testing machine CMT-5L, LG, at a speed of 0.5 mm/min. The results showed that Filtek Z350 XT resin had the highest average adhesion level with 11.32% Mpa, Tetric N-Ceram resin achieved a regular level of 10.17%, and Master Fill resin showed the lowest level with 8.32% Mpa.
  • Miniatura
    ÍtemAcceso abierto
    Evaluation of dimensional accuracy changes and marginal adaptation of models fabricated using 3D dental printers with fixed prosthesis structures: An in vitro study.
    (Universidad Privada Norbert Wiener, 2024-06-14) Lazaro Prudencio, Jhenny Medalit; Gómez Carrión, Christian Esteban
    The objective of this study was to evaluate the differences in dimensional accuracy and marginal fit of models produced using 3D dental printers for fixed prosthesis structures. The methodology used a hypothetical-deductive method with a quantitative approach, applied type, and in vitro experimental design. The sample consisted of 120 models (60 models for LCD printer) (60 models for SLA printer). Two types of 3D printers (LCD and SLA) and the Dental System software by 3Shape were employed to assess the marginal fit with the fixed prosthesis structure and the dimensional distortion of the printed models. The results showed significant differences in dimensional accuracy and marginal fit between the LCD and SLA printers for different dimensions of dental pieces. In the LCD printer, in the Cervico-Occlusal section 3.4, a dimensional accuracy of approximately 0.0439 ± 0.055 mm and a marginal fit of 0.147 ± 0.051 mm were recorded. In contrast, in the SLA printer, in the Mesio-Distal section 3.4, a dimensional accuracy of around 0.1162 ± 0.031 mm and a marginal fit of 0.110 ± 0.031 mm were obtained. In conclusion, there are notable variations in dimensional accuracy and marginal fit in models produced by 3D printers for the creation of dental fixed prostheses (p ≤ 0.05).