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Mudanjiang, China

Xu Y.-l.,Mudanjiang Medical College | Wang D.-l.,Mudanjiang Medical College | Xu W.-x.,Mudanjiang Hongqi Hospital
Chinese Journal of Tissue Engineering Research | Year: 2012

BACKGROUND: Choukroun's platelet-rich fibrin (PRF) and self-setting calcium phosphate cement (CPC) can enhance the repair of bone defects, but either one has its limitation in clinical application. Whether the combination of the two materials can achieve a better effect remains unclear. OBJECTIVE: To investigate the effect of PRF combined with CPC on jaw defect repair. METHODS: Totally 40 patients were divided into two groups randomly. The experimental group (n=20) was filled with the combination of PRF and CPC, while the control group (n=20) was filled with CPC only. RESULTS AND CONCLUSION: In the experimental group, there was a boundary between jaw bone defect area and the surrounding jaw bone tissues, and new bone formed after treatment for 1 month. After 3 months of treatment, the boundaries between bone defect area and the surrounding normal jaw bone tissues were blurred, besides, bone mineral density in bone defect area began to increase and a large number of trabecular bone formed. After 6 months of treatment, the boundaries between the defect area and surrounding normal bone were unclear, and normal bone morphology appeared. In the control group after 6 months of treatment, the boundaries between new bone and the surrounding normal bone were marked, and bone density in the bone cavity of defects area was lower than that in the experimental group at the same period (P < 0.05). These findings suggest that the combination of Choukroun's PRF and CPC can obviously promote bone growth in patients with jaw defects. Source

Zheng Y.,Mudanjiang Normal University | Lu Q.,Mudanjiang Normal University | Lu Q.,Heilongjiang University | Wang J.,Mudanjiang Hongqi Hospital | And 3 more authors.
Optics and Laser Technology | Year: 2014

Yb2O3 nanoparticles synthesized via Pechini type sol-gel method were characterized by TEM, SAED, EDS, XRD, SEM and Raman spectrometer. Their emission properties were recorded by a fluorescence spectrophotometer with a 980 nm laser as the excitation source. These spectral results indicate that there are two optical bistable emissions at low/high laser power densities, i.e. Yb3+-Yb3+ dimer cooperative upconversion luminescence and thermal emission. Thus, Yb2O 3 nanoparticles might be regarded as a candidate for intrinsic optical bistability. © 2014 Elsevier Ltd. Source

Lu Q.,China Institute of Technology | Wu Y.,China Institute of Technology | Ding L.,Mudanjiang Hongqi Hospital | Zu G.,China Institute of Technology | And 3 more authors.
Journal of Alloys and Compounds | Year: 2010

Y2O3:Tb3+ nanoparticles were synthesized using Pechini-type sol-gel method, and characterized by TEM, XRD, and Raman spectra. Their spectroscopic properties are investigated using optical absorption, spectral- and time-resolved upconversion emission spectra. The dependence of Tb3+ emission intensity on pump power density reveals that it is a three-photon excitation process. These results above indicate that upconversion excitation practically originates from the parity-allowed 4f-5d transition via a three-photon simultaneous absorption of Tb3+ ions. The upconversion luminescence intensities of Y2O3:Tb3+ nanoparticles decrease with Tb3+ doping concentrations in the range of 1∼4 mol%. The measured average lifetimes of the 5D4 level of Tb3+ ions also decrease with increasing Tb3+ concentrations at room temperature. © 2010 Elsevier B.V. All rights reserved. Source

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