Navegando por Palavras-chave "PMMA"

Agora exibindo 1 - 2 de 2
  • Nenhuma Miniatura disponível
    Item
    Somente Metadadados
    The impact of facial lipoatrophy treatment with polymethyl methacrylate in AIDS patients as measured by four quality-of-life questionnaires
    (Royal Soc Medicine Press Ltd, 2011-10-01) Warde Filho, Mario Jorge [UNIFESP]; Gragnani, A. [UNIFESP]; Gomes, H. [UNIFESP]; Hochman, Bernardo [UNIFESP]; Ferreira, Lydia Masako [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Life-expectancy increased in patients infected with HIV/AIDS with the advent of highly active antiretroviral therapy (ART). Facial lipoatrophy is a common complication in these patients, eventually leading to stigma, segregation and a negative impact in quality of life (QOL). We measured the impact of the treatment of facial lipoatrophy with polymethyl methacrylate (PMMA) in the QOL of patients with HIV/AIDS by using four questionnaires that address QOL. Forty consecutive patients on ART referred for facial lipoatrophy treatment were enrolled in this study. the first 20 were allocated to the intervention group and were treated with tissue augmentation with PMMA. the other 20 were allocated to the control group, which received treatment only after six months. At baseline, four questionnaires were applied to all patients in both groups and again after six months. the variation in scores within the control group for all domains of all four instruments was significantly better when compared with that within the control group. We detected improvement in the QOL of patients with HIV/AIDS and facial lipoatrophy when they were treated with PMMA.
  • Nenhuma Miniatura disponível
    Item
    Somente Metadadados
    Production of color centers in PMMA by ultrashort laser pulses
    (Elsevier B.V., 2010-03-01) Samad, Ricardo Eigul; Courrol, Lilia Coronato [UNIFESP]; Lugao, Adernar Benevolo; Freitas, Anderson Zanardi de; Vieira Junior, Nilson Dias; CNEN SP; Universidade Federal de São Paulo (UNIFESP)
    We report here the creation of color centers in commercial, transparent PMMA samples by ultrashort: pulses from a Ti:Sapphire laser emitting at 800 nm, with spatial control. Although the 800 nm photon energy is not sufficient to ionize the polymer, the centers are created following a multiphotonic absorption that causes the ionization. We propose that the free electrons quivering motion on the pulse electric field displaces atoms from its equilibrium positions, creating free radicals and double bonds that coalesce into color centers. the absorption and emission spectra of the centers were measured, but a dose-like curve could not be built due to the presence of damages created along with the centers that: scatter the excitation and emission lights due to the commercial sample's poor optical quality. (C) 2009 Elsevier B.V. All rights reserved.