Examinando por Materia "Metal-free crowns"

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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.