RESUMO
This works reports the synthesis and characterization of diallyl(5-(hydroxymethyl)-1,3-phenylene) dicarbonate (HMFBA) and 5-(hydroxymethyl)-1,3-phenylene bis(2-methylacrylate) (HMFBM) monomers and its evaluation as Bis-GMA eluents in the formulation of composite resins for dental use. The experimental materials formulated with HMFBA and HMFBM monomers presented flexural strength values similar to those of the control group formulated with Bis-GMA/TEGDMA. Regarding volumetric contraction percentage, the values obtained of experimental materials with HMFBA was 1.88% and for HMFBM was 4.15%, both lower than control resin (4.68%). In the case of double bond conversion, the resin formulated with HMFBA monomer exhibited a greater degree of conversion (87%). Besides, the DMA analyses proved that the values for Tg guarantee a good mechanical performance at body temperature. The new resins formulated with HMFBA and HMFBM monomers exhibit a cellular viability close to 100%, which indicates the absence of cytotoxicity towards fibroblastic cells.
Assuntos
Resinas Compostas , Fibroblastos/metabolismo , Teste de Materiais , Polietilenoglicóis , Ácidos Polimetacrílicos , Animais , Linhagem Celular , Resinas Compostas/química , Resinas Compostas/farmacologia , Avaliação Pré-Clínica de Medicamentos , Fibroblastos/citologia , Camundongos , Polietilenoglicóis/química , Polietilenoglicóis/farmacologia , Ácidos Polimetacrílicos/química , Ácidos Polimetacrílicos/farmacologiaRESUMO
An electroless deposition process was used to synthesize with a controlled morphology, polycrystalline ZnO on glass substrates as antimicrobial coatings. The influence of deposition temperature (Tdep) on the physicochemical and antimicrobial properties of the ZnO films was analyzed. The results indicated that a change in deposition temperature greatly affected the morphology and the degree of crystallinity of the films. Scanning electron microscope images show that the film surface is porous at a deposition temperature of 40 and 50⯰C, whereas hexagonal-plate shaped morphology predominated at 60⯰C and finally at 70 and 80⯰C the films consisted of rod-like particles. The films showed good transparency in the visible region. All ZnO films presented notable antimicrobial activity against the gram-negative bacteria Escherichia coli (E. coli) and the gram-positive Staphylococcus aureus (S. aureus). It was found that the antimicrobial efficiency is strongly dependent on morphology and structural properties. The best antimicrobial performance was recorded for the films consisting of rod-like morphology with a high degree of crystallinity. The procedure used in this investigation is strongly recommended for the development of functional surfaces.
Assuntos
Antibacterianos/química , Óxido de Zinco/química , Escherichia coli/crescimento & desenvolvimento , Vidro , Reciclagem , Staphylococcus aureus/crescimento & desenvolvimentoRESUMO
Surgical techniques developed for restoring skeletal continuity after a local resection of a bone tumor (limb salvage procedures) revolutionized the management of the patient suffering from osteosarcomas around the knee. In this article the authors review the current status of various reconstruction procedures; they include osteoarticular allograft arthrodesis, rotation plasty, expandable prosthesis and knee arthroplasty. In summary they suggest that the knee arthrodesis is the preferred procedure for young and active patients, the rotation plasty should be recommended as the alternative to amputation for very young patients, and the customized prostheses are preferred for patients with limited longevity.
Assuntos
Neoplasias Ósseas/cirurgia , Articulação do Joelho/cirurgia , Osteossarcoma/cirurgia , Adulto , Angiografia , Neoplasias Ósseas/diagnóstico por imagem , Criança , Feminino , Humanos , Articulação do Joelho/diagnóstico por imagem , Prótese do Joelho , Masculino , Osteossarcoma/diagnóstico por imagemRESUMO
Se presenta un caso de tetanos en una mujer de 21 anos de edade con embarazo de 26 semanas. El periodo de "Cole" fue de solo 40 horas. El sitio de la herida fue el gluteo izquierdo, ocasionada por aguja hipodermica.Nunca habia recebido inmunizacion contra el tetanos. La inmadurez del producto contraindico la operacion cesarea y se dejo evolucionar el embarazo. A pesar de la traqueostomia la insufuciencia respiratoria aguda por paralisis muscular precipito la muerte. En la revision bibliografica efectuada se encontraron solo 10 casos reportados. Una encuesta en 100 puerperas revelo que el medico olvida con frecuencia la inmunizacion con toxoide tetanico de la mujer gestante, en la consulta prenatal
Assuntos
Gravidez , TétanoRESUMO
Se presenta un caso de tetanos en una mujer de 21 anos de edad y embarazo de 26 semanas. El periodo de Cole fue de solo 40 horas. El sitio de la herida fue la region glutea izquierda, ocasionada por aguja hipodermica. Nunca habia recibido inmunizacion contra el tetanos. La inmadurez del producto contraindico la cesarea y dejamos evolucionar el embarazo. A pesar de la traqueotomia, la insuficiencia respiratoria aguda por paralisis muscular precipito la muerte. En la revision bibliografica efectuada encontramos en el mundo solo 10 casos publicados. Una encuesta entre 100 puerperas revelo que el medico olvida con frecuencia la inmunizacion con toxoide tetanico de la mujer gestante en la consulta pre-natal