RESUMEN
PURPOSE: This study aimed to synthesize heat-cured poly(methyl methacrylate) (PMMA) acrylic formulated with copper nanoparticles (nCu) for producing dentures with antimicrobial properties and ability to prevent denture stomatitis (DS). METHODS: nCu/PMMA nanocomposites were prepared through in situ formation of nCu into methyl methacrylate (MMA). The fabricated material was characterized using scanning electron microscopy, spectroscopy (energy-dispersive X-ray, attenuated total reflectance-Fourier-transform infrared, and X-ray photoelectron spectroscopy), X-ray diffraction analysis, and mechanical flexural tests (ISO 20795-1:2008). Antimicrobial activity against Candida albicans and oral bacteria was determined. MTS assay (ISO 10993-5:2009) and copper release experiments were conducted to assess cytotoxicity. In the clinical trial, participants wearing nCu/PMMA (n=25) and PMMA (n=25) dentures were compared; specifically, DS incidence and severity and Candida species proliferation were assessed for 12 months. Data were analyzed using analysis of variance with Tukey's post hoc test (α=0.05). RESULTS: nCu/PMMA nanocomposite loaded with 0.045% nCu exhibited the maximum antimicrobial activity against C. albicans and other oral bacteria without producing cytotoxicity in the wearer. nCu/PMMA dentures retained their mechanical and aesthetic properties as well as inhibited the growth of Candida species on both denture surface and patient palate. DS incidence and severity were lower in the nCu/PMMA denture group than in the PMMA denture group. CONCLUSIONS: PMMA acrylic produced with copper nanotechnology is antimicrobial, biocompatible, and aesthetic and can reduce DS incidence. Thus, this material may act as a novel preventive alternative for oral infections associated with denture use.
Asunto(s)
Antiinfecciosos , Nanopartículas , Humanos , Polimetil Metacrilato/química , Cobre , Bases para Dentadura/microbiología , Antiinfecciosos/farmacología , Nanopartículas/química , Candida albicans , Ensayo de MaterialesRESUMEN
RESUMEN La enfermedad de Parkinson es la segunda enfermedad neurodegenerativa más prevalente en el mundo, y sus manifestaciones cardinales son la bradicinesia, el temblor y la rigidez. Aunque ha sido considerado un trastorno motor, actualmente se considera como un trastorno neurológico complejo que afecta diferentes sistemas, por lo que genera manifestaciones motoras y no motoras variadas, además de manifestaciones autonómicas sistémicas. Las manifestaciones cardiovasculares en pacientes con enfermedad de Parkinson son frecuentes y, además, provocan un gran impacto sobre la calidad de vida. A continuación, se realiza una revisión narrativa de las principales manifestaciones cardiovasculares de la enfermedad de Parkinson, y de sus mecanismos fisiopatológicos.
SUMMARY Parkinson's disease is the second most prevalent neurodegenerative disease in the world and is characterized by bradykinesia, tremor, rigidity, and postural instability. Although it has been considered as a motor system disease, it is currently considered as a complex neurological disease with different motor, non-motor, and autonomic manifestations. Cardiovascular manifestations in patients with Parkinson's disease are frequent and they have a great impact on quality of life. This article seeks to carry out a narrative review of the pathophysiological mechanisms and the main cardiovascular clinical manifestations in patients with Parkinson's disease.