Examinando por Materia "Adaptación marginal"

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Acceso 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).
Acceso abierto
Marginal adaptation in metal caps with the immersion technique and metal-free caps with the Cad-Cam technique in the previous sector in vitro - Lima 2021
(Universidad Privada Norbert Wiener, 2022-02-16) Sangama Trujillo, Ricardo Eugenio; Vergara Pinto, Brenda Roxana
Objective: To determine the difference in marginal adaptation between metal crowns using the immersion technique and metal-free crowns using the CAD-CAM technique in the anterior sector. Methodology: Two types of materials commonly used for the production of dental crowns in the anterior sector were employed. These included 12 chrome-cobalt metal crowns made with the immersion technique and 12 metal-free crowns made with the CAD-CAM technique. These crowns were fabricated over a plaster model of a single dental piece (right central incisor) which had been previously prepared and molded. A total of 24 plaster models were required, with 12 for each study group. Once the crowns were made, they were cemented onto the models, and a cut was made exposing the vestibular and palatal sides. After obtaining both sides of the cemented crowns, the thickness of the cement in the cervical and medial portions between the vestibular face and the corresponding crown portion was measured, as well as the palatal face and its crown portion. Results: The results showed that only 79.2% of the metal crowns achieved marginal adaptation, while 100% of the metal-free crowns achieved adaptation. Furthermore, when comparing the marginal adaptation of the crowns, it was found that the marginal adaptation of the metal crowns was 75.35 and the marginal adaptation of the metal-free crowns was 10.54. Conclusion: Metal-free crowns made with the CAD-CAM technique achieved better marginal adaptation than metal crowns made with the immersion technique.