Development of novel antimicrobial acrylic denture modified with copper nanoparticles.

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.

Manifestaciones cardiovasculares de la enfermedad de Parkinson: revisión de la literatura / Cardiovascular manifestations of Parkinson's disease: literature review

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.

Evolución de la recuperación de la sensibilidad posterior a osteotomía sagital de rama mandibular bilateral / Evolution of sensory recovery following mandibular bilateral sagittal split osteotomy

Introducción. La osteotomía sagital de rama mandibular bilateral es uno de los procedimientos quirúrgicos más comunes durante la cirugía ortognática. Con relación a ello se han descrito múltiples reportes que indican cambios a nivel neurosensitivo en el nervio alveolar inferior. Los rangos posquirúrgicos de parestesia han sido descritos entre un 12,5 y el 100%. El objetivo de este trabajo fue determinar el porcentaje de recuperación sensitiva del territorio inervado por el nervio alveolar inferior después de una osteotomía sagital de rama mandibular bilateral durante el primer año postoperatorio. Método. Se incluyó a 32 pacientes con dismorfosis dentofacial de clase II y III; el procedimiento quirúrgico debía involucrar osteotomía sagital de rama mandibular bilateral. Se realizó seguimiento a 1, 3, 6, 9 meses y al primer año postoperatorio. La evaluación incluyó el uso de monofilamentos de tipo von Frey en un área de mentón cuadriculada estandarizada en cada paciente, un cuestionario y una escala de hipoestesia. El umbral para significación estadística fue una p < 0,05. Los resultados se presentan con relación al área estudiada, género, clase esqueletal y técnica quirúrgica. Resultados. La recuperación neurosensitiva del nervio alveolar inferior alcanzó un 74% total al 1.er año postoperatorio. El promedio de recuperación de la sensibilidad en las 8 zonas de la cuadrícula de la región mentoniana fue de un 65%. Conclusiones. Los sujetos estudiados alcanzaron una recuperación de la sensibilidad clasificada como hipoestesia moderada al primer año postoperatorio. El género femenino alcanzó mayores valores de recuperación (83 vs. 69%) y en un menor tiempo que el género masculino. Destacamos el uso de 3 métodos de evaluación que nos permiten comparar lo objetivo y subjetivo, obteniendo resultados concordantes entre sí (AU)

Introduction. Bilateral sagittal split osteotomy is one of the most common surgical procedures performed during orthognathic surgery. Postoperative reports have described neurosensory changes related to the inferior alveolar nerve. Paresthesia has been described in relation to its damage ranging between 12.5 and 100%. The aim of this study was to determine the percentage of sensitive recovery in the compromised area after bilateral sagital split osteotomy during the first postoperative year. Method. The study included 32 patients with class II and class III dentofacial deformity. Surgical procedure must include bilateral sagittal split osteotomy. Follow-up was performed at 1st, 3rd, 6th, 9th and 12th postoperative months. The evaluated area was determined by a novel technique that consists in dividing the chin in squares of 8 equal parts. Sensorial recovery was tested using calibrated von Frey monofilaments. Results are displayed in relation to the studied area, gender, skeletal class and surgical technique. Statistical significance was accepted with a P<.05. Results. In this study, the inferior alveolar nerve reached 74% recovery rate after the first postoperative year. The average sensitivity recovery, over the chin region, in the eight-grid zone was 65%. Conclusion. Studied subjects reached a sensitivity recuperation that could be classified as mild hypoesthesia after the first year since surgery. The female population reached higher recovery values (83 vs. 69%) than the male population. They also seem to recover in less time than males. Importantly, we have observed that the use of these 3 methods of evaluation allow us to compare the objective and subjective characteristics of the population with similar results (AU)