Effect of Concentrated Growth Factor alone and mixed with Hyaluronic Acid on Osseointegration of Delayed Implant.

Purpose: The aim of current study was evaluating effect of concentrated growth factor alone and mixed with hyaluronic acid on osseointegration of delayed implant. Subject and Methods: A total of 12 patients, ranging in age from 20 to 45 years old, were divided into two groups in random manner. Group A: Dental implants were placed associating with concentrated growth factor. Group B: Dental implants were placed associating with concentrated growth factor and hyaluronic acid. Treatment changes were evaluated for each group and compared between groups. Results: In the mean of implant stability a statistically significant difference existed within group A as implant stability increased from base line immediately after implant insertion to follow up period after six months, also statistically significant difference existed in the mean of Implant Stability within group B as implant stability decreased from base line immediately after implant insertion to follow up period after six months. Also, there was statistically significant difference in the mean of Implant Stability between the two groups. Conclusions: Concentrated growth factor alone have positive effect on bone osseointegration

Highly improved optical properties of silicon nanowires by deposition of Poly[2-methoxy-5-(2 '-ethylhexyloxy)-1,4-phenylene vinylene] polymer

International audienceThis paper reports on the effect of the Poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) deposition on the chemical composition and the optical properties of silicon nanowires (SiNWs). The SiNWs were obtained by a single-step Ag-assisted chemical etching method, and then coated by MEH-PPV polymer using the electroless dipping method. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Fourier Trans-formed Infra-Red (FTIR) spectroscopy were used to probe the deposition of the polymer on the SiNWs surface and its chemical interaction with them. The optical properties of the elaborated samples were investigated by pho-toluminescence (PL) spectroscopy. The PL spectra show that the PL emission range of the nanowires is practically the same as that of the MEH-PPV. We also get an enhancement of five orders of the integrated PL intensity of MEH-PPV/SiNWs sample compared to that of untreated SiNWs sample. The PL intensity enhancement is attributed to the luminescent centers of MEH-PPV molecules as well as the passivation of silicon nanowires surface. Interchain and intrachain transitions in the polymeric layer as well as the carriers transfer between SiNWs and MEH-PPV are the main sources of the multiband PL spectra