ABSTRACT
There is a significant change in the bacterial plaque populations in the oral cavity during and after orthodontic treatment. Numerous studies have demonstrated that 2−96% of patients could increase the risk of white spot lesions. Streptococcus mutans and Lactobacilli ssp. are responsible for these white spot lesions. In this work, silver nanoparticles (AgNPs) with a diameter of 11 nm and dispersed in water were impregnated onto three different commercial orthodontic adhesives at 535 µg/mL. The shear bond strength (SBS) was assessed on 180 human premolars and metallic brackets. The premolars were divided into six groups (three groups for the commercial adhesives and three groups for the adhesives with AgNPs). All the groups were tested for their bactericidal properties, and their MIC, MBC, and agar template diffusion assays were measured. After adding AgNPs, the SBS was not significantly modified for any adhesive (p > 0.05), and the forces measured during the SBS did not exceed the threshold of 6 to 8 MPa for clinical acceptability in all groups. An increase in the bactericidal properties against both S. mutans and L. acidophilus was measured when the adhesives were supplemented with AgNPs. It was concluded that AgNPs can be supplement commercial orthodontic adhesives without modifying their mechanical properties with improved bactericidal activity.
Subject(s)
Dental Bonding , Dental Caries , Metal Nanoparticles , Humans , Surface Properties , Metal Nanoparticles/chemistry , Silver/pharmacology , Silver/chemistry , Anti-Bacterial Agents/pharmacology , Anti-Bacterial Agents/chemistry , Dental Cements/pharmacology , Dental Caries/prevention & control , Shear Strength , Materials TestingABSTRACT
Los autores presentan una revisión de la displasia del desarrollo de la cadera, explican las razones que motivaron que se abandonara el uso del término "luxación congénita de cadera". Se examinan las causas intrauterinas predisponentes, cuadro clínico, diagnóstico y tratamiento en las diferentes etapas del desarrollo
Subject(s)
Humans , Infant, Newborn , Infant , Hip Dislocation, Congenital/diagnosis , Hip Dislocation, Congenital/etiology , Hip Dislocation, Congenital/pathology , Hip Dislocation, Congenital/therapyABSTRACT
Se informa un caso de condrodisplasia punctata rizomélica. Esta es una displasia ósea poco frecuente; su diagnóstico es clínico y radiológico. Se trata de una afección de carácter autosómico recesivo, en la que hay alteración de los peroxisomas, caracterizada bioquímicamente por daño en la biosíntesis del plasmalógeno y del catabolismo del fitanato.
Subject(s)
Humans , Male , Infant , Chondrodysplasia Punctata/physiopathology , Chondrodysplasia Punctata/genetics , PrognosisABSTRACT
En detallada descripción se presenta una revisión actualizada de la situación relativa a tres entidades patológicas de las vías respiratorias de los niños que tanto por lo elevado de su frecuencia en nuestro medio, como las complicaciones y estados crónicos a que pueden dar lugar, constituyen problemas comunes en la práctica profesional cotidiana en pediatras y médicos generales que atienden niños. La etiología, el cuadro clínico, los elementos de diagnóstico y el manejo y tratamiento de la rinitis, sinusitis y faringoamigdalitis son analizados, valorándose debidamente los diversos recursos disponibles para la atención oportuna y adecuada de dichos padecimientos.
