Browsing by Author "Lupu Flores, Billy Darlin"

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Comparative Analysis of the Structural Weights of Fixed Prostheses of Zirconium Dioxide, Metal Ceramic, PMMA and 3DPP Printing Resin—Mechanical Implications
(2023) Abad Coronel, Cristian Gustavo; Pacurucu Mendieta, Miguel David; Lupu Flores, Billy Darlin; Velez Chimbo, David Alejandro
The aim of this study was to determine the mechanical implications of four-unit fixed dental prostheses (FDPs) made of (1) monolithic zirconium dioxide (ZR O2), (2) polymethylmethacrylate (PMMA), (3) metal ceramic (PFM) and (4) impression resin (3DPP). Methods: Four groups were studied with eight samples for each material (n: 32). Each structure was weighed, subjected to compressive tests and analyzed using 3D FEA. Results: PMMA presented the lowest structural weight (1.33 g), followed by 3DPP (1.98 g), ZR O2 (6.34 g) and PFM (6.44 g). In fracture tests, PMMA presented a compressive strength of 2104.73 N and a tension of 351.752 MPa; followed by PFM, with a strength of 1361.48 N and a tension of 227.521 MPa; ZR O2, with a strength of 1107.63 N and a tension of 185.098 MPa; and 3DPP, with a strength of 1000.88 N and a tension of 143.916 MPa. According to 3D FEA, 3DPP presented the lowest degree of deformation (0.001 mm), followed by PFM (0.011 mm), ZR O2 (0.168 mm) and PMMA (1.035 mm). Conclusions: The weights of the materials did not have a direct influence on the mean values obtained for strength, stress or strain. Since the performance was related to the tension and forces supported by the structures in critical zones, the importance of considering design factors is clear. In vitro and 3D FEA assays allowed us to simulate different scenarios for the mechanical properties of certain materials before evaluating them clinically. Thus, they can generate predictions that would allow for the design of a better research methodology in future clinical trials.
Uso de láser de baja potencia en la aceleración del movimiento dental durante el tratamiento ortodóncico: revisión sistemática
(2020) Gavilanes Sarmiento, Sebastian Anthony
Abstract Orthodontic treatments in recent years have demanded alternatives that could make them shorter and less painful, studies have evaluated that laser can be used satisfactorily in this specialty. The purpose of the present study was to investigate the scientific evidence available to support the application of low-level laser therapy to accelerate tooth movement during orthodontic treatment. 35 articles related to the proposed topic were identified. Of which, 10 articles were excluded because they did not meet the parameters requested in relation to the subject. 25 full articles were selected for review and qualitative analysis. It can be concluded that the application of low intensity laser could become effective in accelerating dental movement during orthodontic treatment, however, more available evidence is still required in order to establish a fixed protocol.