Técnica indireta com resinas compostas para uso direto em restauração de dentes posteriores: cimentação resinosa - Parte III / Indirect technique with composite resins for direct use in restorations of posterior teeth: luting resin (Part III)

A escolha do agente de cimentação ideal para restaurações indiretas depende do material restaurador utilizado, das propriedades e características dos agentes cimentantes e do preparo dentário. Porém, a preferência profissional é um fator determinante na escolha. Este artigo descreve o passo a passo da cimentação de restauração indireta em resina composta para uso direto

The choice of ideal cementing agent for indirect restorations depends on the restorative material, the properties and characteristics of cementing agents and dental preparation. However, the professional preference is a determining factor in choice. This article describes the step by step cementation of indirect restoration with composite resin for direct use

Tecnica indireta com resinas compostas para uso direto para restauraçao de dentes posteriores: estratificação, escultura dental e polimerização adicional (Parte II) / Indirect technique with composite resins for direct use in restorations of posterior teeth: stratification, dental sculpture and addition polymerization (Part II)

O desenvolvimento constante e evolução dos compósitos, juntamente das técnicas restauradoras em dentes posteriores, possibilitam melhores propriedades mecânicas e ópticas desses materiais, aumentando sua longevidade clínica. O emprego da polimerização adicional das resinas compostas realizado com calor, luz e pressão (ou associação dos métodos) resulta em melhores resultados na estabilidade dimensional, bem como da resistência diametral e à compressão. Este artigo descreve a técnica de estratificação e escultura dental em restauração de resina composta em dente posterior e destaca o uso e a importância da polimerização adicional

Constant development and evolution of the composites, along with restoration techniques in posterior teeth, allow better mechanical and optical properties of these materials, extending their clinic longevity. The usage of addition polymerization of the composite resins performed with heat, light and pressure (or a combination of these methods), presents better results for dimensional stability as well as for diametric resistance and compression. This work describes the technique of stratification and dental sculpture on composite resin restoration in posterior teeth, and highlights the use and the importance of addition polymerization

Técnica indireta com resinas compostas para uso direto para restauração de dentes posteriores: preparo dentário, moldagem e provisório - parte I / Indirect technique with composite resins for direct use in restorations of posterior teeth: dental preparation, molding and provisional - part I

A utilização de sistemas adesivos autocondicionantes de dois passos em restaurações de dentes posteriores e para o selamento imediato da dentina, garante melhores resultados na resistência de união dente-prótese, diminui a sensibilidade dentinária e protege o complexo dentino-pulpar. As resinas fluidas aplicadas para regularização e forramento da cavidade são essenciais para diminuir as tensões geradas pelo estresse de contração. A confecção de restauração provisória é essencial para manutenção funcional do dente e, consequentemente, proteção das estruturas envolvidas

The use of adhesive systems self-etching of two steps in posterior restorations and for the immediate dentin sealing, ensures better results in the bond strength of tooth-prosthesis, decrease the sensitivity of dentin and protect the pulp-dentin complex. The fluid resins applied for regularization and lining of the cavity are essential to reduce the tensions generated by the shrinkage stress. Making the provisional restoration is essential for functional maintenance of the tooth and, consequently, protection of the structures involved

Changes in human serum antioxidant capacity and peroxidation after four months of exposure to air pollutants

Twenty-one adult volunteers (aged 27-32 years), who had been living in Mexico City for four continuous months (physicians working as fellows) were studied the first and sixteenth week of their stay in order to learn the effect of the pollutants contained in Mexico City's atmosphere on some serum biochemical parameters. The activity of serum superoxide dismutase (SOD) decreased after 16 weeks in comparison with the values obtained the first week (109.6 to 56.9 mU/mg protein; 50 percent less). In contrast, the inhibitory capacity of serum vs. induced in vitro lipoperoxidation increased in relation to the length of stay (22 percent). The serum levels of thiobarbituric-reactive material also decreased in almost 30 percent (from 6.10 to 4.12 nmol). The other lipoperoxides measured were unchanged (chromolipids and diene conjugation). We propose that this may be as a result of the adaptive capacity of the human orgnaisms, within a pollutant atmosphere in which the ozone levels might participate in a decrease of SOD activity during chronic exposure, to air pollution

Possible effect of air pollutants (Mexico City) on superoxide dismutase activity and serum lipoperoxides in the human adult

The action of air pollutants, through their constituents, (O3, NO2, tobacco smoke) are capable of causing damage due to their lipoperoxidative properties or, indirectly, by inducing production of free radicals. As a consequence of photochemical processes, the ozone levels in the atmosphere of Mexico City are generally higher (mean of 0.325 ppm; period between 1987 - 1992) and may be harmful to health. Sixty two volunteers (medical doctors), aged 27-32 years, were divided into three groups. Group A was composed of those persons /17) who had never lived in Mexico City; a second group (B) (21) had recently arrived in Mexico City (1-8 days); and a third group (C) (24) who had permanently resided in mexico City. Serum was obtained from fresh whole blood. Superoxide dismutase (SOD) activity and thiobarbituric acid-reactive materials were higher in group B while chromolipids and the serum inhibitory capacity (for lipoperoxidation) was higher in group C. The acute exposure to pollutants in group B apparently may have induced SOD as an antioxidant defense and was responsible for the increased level of TBA reactive material. In group C, the significant finding is better antioxidative defenses and slightly higher chromolipids

Cocaína: aspectos clínicos, tratamiento y rehabilitación / Cocaine: treatment, rehabilitacion and clinical aspects

Estudia el problema del uso y abuso de la cocaína, analizando los aspectos epidemiológicos, clínicos, de tratamiento y de rehabilitación. Presenta al enfoque conductual-cognoscitivo como un muy eficaz instrumento teórico práctico para la comprensión de las diversas fases de la rehabilitación. Propone un programa conductal cognitivo para el tratamiento y rehabilitación de este tipo de pacientes

Uso del halo cefálico preoperatorio en las deformidades estructuradas de la columna vertebral / Pre-operative halo-traction in treatment of structural spinal deformities. Report of 32 cases

En el departamento de ortopedia del Hospital Universitario de Monterrey, N.L., México, desde enero de 1983 se han aplicado 32 halos cefálicos en pacientes con deformidades de la columna verteral. El objetivo de este trabajo es comentar la técnica empleada en la aplicación del halo; mencionar los casos en que se ha utilizado, así como dar a conocer el alto porcentaje de seguridad en su aplicación y la baja incidencia de complicaciones.

Instrumentación de Harrington con alambrado sublaminar total en escoliosis flexibles / Harrington instrumentation and sublaminar wiring for flexible scoliosis

De marzo de 1984 a noviembre de 1988 en el Servicio de Ortopedia del Hospital Universitario "Dr. José E. González" y del Hospital Regional del ISSSTE de Monterrey, Nuevo León, se trataron quirúrgicamente 25 pacientes con diagnóstico de escoliosis idiopática del adolescente y paralítica por poliomielitis que presentaban curvas torácicas o toracolumbares arriba de 40 grados, que dinámicamente corregían 50%o más. Se practicó instrumentación de Harrington más alambrado sublaminar total; el seguimiento mínimo fue de un año. No hubo complicaciones importantes. La corrección obtenida fue de 62%en promedio.

Sindrome de Eaton-Lambert / Eaton-Lambert's Syndrome

Se presenta un paciente de 63 anos con sindrome de Eaton-Lambert asociado a un carcinoma de celulas en avena en el pulmon. El paciente presentaba debilidad muscular proximal, ptosis palpebral izquierda que luego se hizo bilateral, cambio en el tono de la voz, dificultad para toser y para degluir alimentos. Los RX de torax mostraron una imagen densa en el tercio superior del pulmon derecho y la broncoscopia demostro una masa tumoral que ocluia totalmente la luz del bronquio superior y parcialmente del bronquio intermediario derecho. La EMG demostro la facilitacion post-ejercicio al estimulo repetitivo. Llamamos la atencion sobre este sindrome en pacientes mayores de 50 anos con sintomatologia de miastenia y sobre la necesidad de buscar un carcinoma broncogenico.