Synthesis and Characterization of Silver Nanoparticles on Orthodontic Brackets: A New Alternative in the Prevention of White Spots

Abstract: Silver nanoparticles (AgNPs) are used for their powerful antibacterial e ect and their ability to adhere to surfaces due to their size; they are used in di erent areas of life, mainly in the area of health as medicine. More recently, in dentistry, the synthesis and characterization of AgNPs attracted significant attention due to their antibacterial properties. In this study, the AgNPs were synthesized using the most e ective method on di erent orthodontic brackets (metallic and esthetic) and characterized by scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and transmission electron microscopy (TEM). Their antimicrobial e ect was tested against the widely used standard human pathogens Staphylococcus aureus (Gram-negative) and Escherichia coli (Gram-positive). Our results showed that, via a simple chemical method, AgNPs can be synthesized on the surface of orthodontic brackets with good antimicrobial activity and the possibility of reducing dental decay, periodontal disease and white spots generated during orthodontic treatment

Green Synthesis of Silver Nanoparticles Using Heterotheca inuloides and Its Antimicrobial Activity in Catgut Suture Threads

Abstract Silver nanoparticles were synthesized through a green method, using Heterotheca inuloides as a bioreducing agent. Moreover, catgut suture threads were decorated with those biogenic silver nanoparticles, and their antibacterial activity versus highly resistant pathogenic microorganisms was evaluated. The principles of green chemistry and nanotechnology allow us to obtain advanced materials, such as suture threads, which can reduce or avoid the prevalence of infectious processes in the medical field. Mexican medicinal plants, such as H. inuloides, represent an adequate alternative for biosynthesis; this plant species is known for its medicinal benefits and its antibacterial activity, and for that reason, it is being used in folk medicine

Evaluación de la situación financiera de la empresa Tabacalera de Nicaragua en la ciudad de Estelí por medio de la aplicación de herramientas financieras, durante el año 2019

En el proceso investigativo realizado se determinó la situación financiera de la empresa Tabacalera de Nicaragua de la ciudad de Estelí por medio de la aplicación de herramientas financieras, durante el año 2019. De esta manera es necesario aplicar herramientas financieras que facilite el análisis de los Estados Financieros para la correcta toma de decisiones en las actividades económicas de la tabacalera. Para obtener la información fue necesario la aplicación de tres instrumentos tales como: entrevista y guías de observación dirigida la Contadora General y Responsable de Recursos Humanos (RRHH) de la empresa. Los resultados de estudio indican los beneficios de la aplicación de herramientas de análisis financiero para desarrollar estrategias dirigidas a la administración y área financiera para la correcta toma de decisiones

Green Synthesis of Silver Nanoparticles Using <em>Heterotheca inuloides</em> and Its Antimicrobial Activity in Catgut Suture Threads

Silver nanoparticles were synthesized through a green method, using Heterotheca inuloides as a bioreducing agent. Moreover, catgut suture threads were decorated with those biogenic silver nanoparticles, and their antibacterial activity versus highly resistant pathogenic microorganisms was evaluated. The principles of green chemistry and nanotechnology allow us to obtain advanced materials, such as suture threads, which can reduce or avoid the prevalence of infectious processes in the medical field. Mexican medicinal plants, such as H. inuloides, represent an adequate alternative for biosynthesis; this plant species is known for its medicinal benefits and its antibacterial activity, and for that reason, it is being used in folk medicine

Agreement of the Discrepancy Index Obtained Using Digital and Manual Techniques—A Comparative Study

The discrepancy index evaluates the complexity of the initial orthodontic diagnosis. The objective is to compare whether there is a difference in the final discrepancy index score of the American Board of Orthodontics (ABO) when obtained using digital and manual techniques. Fifty-six initial orthodontic records in a digital and physical format were included (28 each) in 2022 at the Center for Research and Advanced Studies in Dentistry. For the digital measurements, iTero and TRIOS 3 intraoral scanners were used, along with Insignia software and cephalometric tracing with Dolphin Imaging software. Manual measurements were obtained in dental casts using the ruler indicated for the previously mentioned discrepancy index, in addition to conventional cephalometric tracing. Student’s t-test did not show statistically significant differences between the digital and manual techniques, with final discrepancy index scores of 24.61 (13.34) and 24.86 (14.14), respectively (p = 0.769). Cohen’s kappa index showed very good agreement between both categorical measure ments (kappa value = 1.00, p = 0.001). The Bland–Altman method demonstrated a good agreement between continuous measurements obtained by both techniques with a bias of 0.2500 (superior limit of agreement =9.0092988, inferior limit of agreement = −8.5092988). Excellent agreement was observed in obtaining the discrepancy index through digital technique (Intraoral scanning and digital records) and manual technique (conventional records)

Mechanical Properties and Antibacterial Effect on Mono-Strain of Streptococcus mutans of Orthodontic Cements Reinforced with Chlorhexidine-Modified Nanotubes

Recently, several studies have introduced nanotechnology into the area of dental materials with the aim of improving their properties. The objective of this study is to determine the antibacterial and mechanical properties of type I glass ionomers reinforced with halloysite nanotubes modified with 2% chlorhexidine at concentrations of 5% and 10% relative to the total weight of the powder used to construct each sample. Regarding antibacterial effect, 200 samples were established and distributed into four experimental groups and six control groups (4 +ve and 2 −ve), with 20 samples each. The mechanical properties were evaluated in 270 samples, assessing microhardness (30 samples), compressive strength (120 samples), and setting time (120 samples). The groups were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy, and the antibacterial activity of the ionomers was evaluated on Streptococcus mutans for 24 h. The control and positive control groups showed no antibacterial effect, while the experimental group with 5% concentration showed a zone of growth inhibition between 11.35 mm and 11.45 mm, and the group with 10% concentration showed a zone of growth inhibition between 12.50 mm and 13.20 mm. Statistical differences were observed between the experimental groups with 5% and 10% nanotubes. Regarding the mechanical properties, microhardness, and setting time, no statistical difference was found when compared with control groups, while compressive strength showed higher significant values, with ionomers modified with 10% concentration of nanotubes resulting in better compressive strength values. The incorporation of nanotubes at concentrations of 5% and 10% effectively inhibited the presence of S. mutans, particularly when the dose–response relationship was taken into account, with the advantage of maintaining and improving their mechanical properties

Oral squamous cells carcinoma, severity of belated diagnosis: Case report and review of the literature

Se presentan los aspectos clínicos, anatomopatológicos e inmunohistoquímica de un caso de COCE diagnosticado tardíamente con desenlace fatal, así como un reporte retrospectivo-descriptivo. Se analizan los datos de la historia clínica, el estudio anatomopatológico y se mide el índice de proliferación celular a través del anticuerpo Ki-67. El resultado de este caso en etapa avanzada de cáncer es la muerte del paciente. Se resalta la importancia de un examen bucal realizado por un profesional con capacidad de identifcar lesiones de forma precoz que pueda contribuir en la disminución de muertes por COCE en México. El carcinoma oral de células escamosas (COCE), que afecta en especial a hombres mayores de 50 años, es causado principalmente por el consumo excesivo de alcohol y tabaco

Breve historia de la Facultad de Odontología

La Facultad de Odontología se fundó el 27 de diciembre de 1963 e inició actividades el 3 de marzo de 1964. Años más tarde, el 19 de mayo de 1986, el H. Consejo Universitario aprobó su cambio de escuela a Facultad de Odontología. La conmemoración de 55 años de esta Facultad y 40 años de hermandad con las Universidades de Meikai y Asahi, se constituye un momento oportuno para manifestar el testimonio de cuanto han realizado hombres y mujeres que han dejado huella en esta institución

Ciencia Odontológica 2.0

Libro que muestra avances de la Investigación Odontológica en MéxicoEs para los integrantes de la Red de Investigación en Estomatología (RIE) una enorme alegría presentar el segundo de una serie de 6 libros sobre casos clínicos, revisiones de la literatura e investigaciones. La RIE está integrada por cuerpos académicos de la UAEH, UAEM, UAC y UdeG

Mis casos clínicos de especialidades odontológicas

Libro que muestra la atención de casos clínicos particulares referente a las diferentes especialidades odontológicasLibro que muestra la atención de casos clínicos particulares referente a las diferentes especialidades odontológicasUniversidad Autónoma de Campeche Universidad Autónoma del Estado de Hidalgo Universidad Autónoma del Estado de Méxic