LUCIANO BACHMANN
39 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 39
Resumo IPEN-doc 01816 Effect of Er:YAG and diode lasers in the adhesion of blood components and in the morphology of irradiated root surfaces2004 - THEODORO, L.H.; GARCIA, V.G.; ZEZELL, D.M.; HAYPEK, P.; BACHMANN, L.; SAMPAIO, J.E.C.The aim of this study was to evaluate in vitro the adhesion of blood components on root surfaces irradiated with Er:YAG (2.94??m) and GaAlAs Diode (808 nm) lasers and these effects on irradiated root surfaces. It was obtained 100 samples of human teeth. They were scaled and divided into five groups of 20 samples each: G1 (Control); G2 -Er:YAG laser (7.6 J/cm2); G3 - Er:YAG laser (12.9 J/cm2); G4 -Diode laser (90 J/cm2) and G5 - Diode laser (108 J/cm2). After these treatments were conducted, 10 samples of each group received a blood tissue, and the reminiscent 10 samples did not receive such treatment. After laboratorial treatments the samples were analysed by scanning electron microscopy. The results have shown that there were no significant differences between the Control Group and the groups treated with Er:YAG laser (p=0,9633 and 0,6229); G4 and G5 were less effective than the Control Group and the Er:YAG laser groups (p<0,01). No proposed treatment increased the adhesion of blood components in a significant way when compared to the Control Group; although the Er:YAG laser did not interfere in the adhesion of blood components it caused more changes on the root surface, while the Diode laser inhibited the adhesion.Resumo IPEN-doc 01531 Changes in chemical composition and collagen structure of dentin tissue after erbium laser irradiation2004 - BACHMANN, L.; DIEBOLDER, R.; HIBST, R.; ZEZELL, D.M.The erbium laser light has a great affinity to the water molecule, which is present in great quantity in biological hard tissues. The objective of this work is to identify chemical changes by infrared spectroscopy of irradiated dentin by an Er:YAG - 2.94μm laser. The irradiation was performed with fluences between 0.365 J/cm2 and 1.94 J/cm2. For the infrared analysis a Fourier transform infrared spectrometer was used. After the irradiation were observed: loss of water, alteration of the structure and composition of the collagen and increase of the OH- radical. These alterations can be identified by a decrease of the water and OH- band between 3800-2800 cm-1, bands ascribed to collagen structure between 1400-1100 cm-1. The results show that the erbium laser changes the structure and composition of the organic matrix, OHradical and the water composition in the irradiated dentin.Resumo IPEN-doc 28119 Infrared absorption bands characterization of dentin tissue when irradiated by erbium laser2002 - ZEZELL, D.M.; BACHMANN, L.; DIEBOLDER, R.; HIBST, R.The erbium laser radiation is highly absorbed by water molecules present in hard tissues. Erbium laser irradiation effects can be classified in two different regimens: ablative, which produces material removal or sub-ablative, that produces a controlled heated process in the irradiated and adjacent regions. For the Er:YAG laser the ablative threshold is very low, around 1.5J/cm2. When dentin is irradiated bellow threshold, chemical and physical changes can occur. The objective of this work is to identify the infrared absorption changes at dentin tissue induced by the Er:YAG laser irradiation al 2.94 μm with sub-ablative energy densities. In this work it were used energy densities between 0.365 J/cm2 and 1.94 J/cm2 to irradiate 0.5mm slices of bovine dentin. For the infrared analysis a Fourier Transform Infrared spectrometer was used. The studied region was between 4000 cm-1 and 400cm-1 (2.5μm and 25μm). After the laser irradiation, two main changes were observed in the analyzed spectral region: loss of water and alteration in the structure of organic matrix. These alterations can be identified by intensity decrease of the water band between 3800cm-1 and 2800cm-1 and in those bands between 1400cm-1 and 1100cm-1. Only a partial reversion of the water band pattern was observed after 24 hours of hydration, suggesting that erbium laser produces an irreversible alteration in the structure of the organic matrix when irradiated with energy densities bellow the ablation threshold.Artigo IPEN-doc 22516 Infrared spectroscopy of dentin irradiated by erbium laser2003 - BACHMANN, LUCIANO; DIEBOLDER, ROLF; HIBST, RAIMUND; ZEZELL, DENISE M.Artigo IPEN-doc 22334 ATR-FTIR spectroscopy to study the effects of laser irradiation in bone tissue2014 - BENETTI, CAROLINA; SANTOS, MOISES O. dos; ANA, PATRICIA A. da; BACHMANN, LUCIANO; ZEZELL, DENISE M.Artigo IPEN-doc 21611 Mid-infrared spectroscopy analysis of the effects of Erbium, Chromium:Yattrium-Scandium-Gallium-Garnet (Er, Cr:YSGG) laser irradiation on bone mineral and organic components2015 - BENETTI, CAROLINA; ANA, PATRICIA A.; BACHMANN, LUCIANO; ZEZELL, DENISE M.Capítulo IPEN-doc 14987 Fundamentos da fisica do laser e interacao da radiacao laser com tecido biologico2010 - ZEZELL, DENISE M.; ROSSI, WAGNER de; BACHMANN, LUCIANOCapítulo IPEN-doc 14658 Laser physics and laser tissue interactions2007 - BACHMANN, LUCIANO; ZEZELL, DENISE M.Livro IPEN-doc 11291 Estrutura e composição do esmalte e da dentina: Irradiação laser e tratamento térmico2005 - BACHMANN, LUCIANO; ZEZELL, DENISE M.Resumo IPEN-doc 09219 Efeito da irradiacao de superficies radiculares com laser de Er:YAG e diodo - analise termica e morfologica2002 - THEODORO, L.H.; HAYPEK, P.; BACHMANN, L.; GARCIA, V.G.; ZEZELL, D.M.; SAMPAIO, J.E.C.