ALBERTO BLAY
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Artigo IPEN-doc 23129 Effects of a low-intensity laser on dental implant osseointegration: removal torque and resonance frequency analysis in rabbits2016 - BLAY, ALBERTO; BLAY, CLAUDIA C.; TUNCHEL, SAMY; GEHRKE, SERGIO A.; SHIBLI, JAMIL A.; GROTH, EDUARDO B.; ZEZELL, DENISE M.The objective of this study was to investigate how a low-intensity laser affects the stability and reverse torque resistance of dental implants installed in the tibia of rabbits. Thirty rabbits received 60 dental implants with the same design and surface treatment, one in each proximal metaphysis of the tibia. Three groups were prepared (n = 10 animals each): conventional osseointegration without treatment (control group), surgical sites irradiated with a laser beam emitted in the visible range of 680 nm (Lg1 group), surgical sites irradiated with a laser beam with a wavelength in the infrared range of 830 nm (Lg2 group). Ten irradiation sessions were performed 48 hours apart; the first session was during the immediate postoperative period. Irradiation energy density was 4 J/cm(2) per point in 2 points on each side of the tibias. The resonance frequency and removal torque values were measured at 2 time points after the implantations (3 and 6 weeks). Both laser groups (Lg1 and Lg2) presented a significant difference between resonance frequency analysis values at the baseline and the values obtained after 3 and 6 weeks (P > .05). Although the removal torque values of all groups increased after 6 weeks (P < .05), both laser groups presented greater mean values than those of the control group (P < .01). Photobiomodulation using laser irradiation with wavelengths of 680 and 830 nm had a better degree of bone integration than the control group after 6 weeks of observation time.Artigo IPEN-doc 20280 Surface alterations of zirconia and titanium substrates after Er, Cr:YSGG irradiation2015 - MIRANDA, PERSIO V.; RODRIGUES, JOSE A.; BLAY, ALBERTO; SHIBLI, JAMIL A.; CASSONI, ALESSANDRAThis study investigated changes in the roughness parameters (Sa in μm2 and Ra in μm) of yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) and large-grit sandblasted acid-etched (SLA) titanium (TI) materials after decontamination by erbium chromium-doped:yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser irradiation. Twenty disks were analyzed in this study: 10 disks of Y-TZP (5 mm in diameter and 3 mm in height), standardized with CAD–CAM procedures, and 10 disks of SLA TI (5 mm in diameter and 4 mm in thickness). Disks were randomized into four groups (n=5), according to whether laser irradiation was performed: Y-TZP_G1 and TI_G1 were not treated by laser (control groups), whereas Y-TZP_G2 and TI_G2 were irradiated with Er,Cr:YSGG laser (1.5 W/20 Hz, air–water cooling proportion of 80 %/25 %). The surface topography of the disks was analyzed by confocal light microscopy. The mean Sa and Ra values were calculated from five profiles from each group. The results were statistically analyzed by t-test at the 95 % confidence level (α=0.05). For Y-TZP, the Sa results (in mean±SD) for Y-TZP_G1 and Y-TZP_G2 were 2.60±1.1 and 0.80±0.17 μm2 , respectively, and the Ra results were 2.01± 0.71 and 0.18±0.15 μm, respectively (both p<.05). For SLA TI, the Sa results for TI_G1 and TI_G2 were 1.99±0.5 and 3.37±0.75 μm2 , respectively, and the Ra results were 1.78± 0.53 and 3.84±0.63 μm, respectively (both p<.05). Er,Cr:YSGG laser irradiation alters the surface roughness of zirconia and SLA TI.