Chong Zhang

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In this paper, the directed transfer function (DTF) method is used to characterize changes in the functional coupling of EEG rhythms in different brain cortical areas due to the mental fatigue caused by long-term cognitive tasks. There is a parietal-to-frontal functional coupling of the total (0.5-30 Hz) EEG frequency band in the right and middle brain(More)
PURPOSE To evaluate the clinical outcomes as well as related factors of dental implants replaced in previously failed sites. METHODS A total of 12 patients (15 implants) who received replacement in previously failed sites during January 2005 to December 2011 were included. Outcomes of redo-implants were collected and clinical data was recorded and(More)
OBJECTIVES Previous studies have shown duodenal-jejunal exclusion (DJE) results in the rapid resolution of type 2 diabetes; however, the underlying mechanism is unknown. This study aimed to measure the hepatic expression of insulin receptor substrate-2 (IRS-2) and glucose transporter-2 (GLUT-2) in type 2 diabetic rats post-DJE, and to investigate their(More)
Mental states such as stress and anxiety can cause heart disease. On the other hand, meditation can improve cardiac performance. In this study, the heart rate variability, directed transfer function and corrected conditional entropy were used to investigate the effects of mental tasks on cardiac performance, and the functional coupling between the cerebral(More)
PURPOSE To evaluate the influence of crown-to-implant ratio (C/I ratio) on the results of restoration in the posterior region. METHODS From January 2007 to January 2012,119 patients with 208 ITI implants in the posterior region were followed up for 6-66 months. Implant restorations were divided into three groups according to their respective clinical C/I(More)
Computing the Nonlinear regressive (NLR) coefficients of electroencephalogram (EEG) rhythms at different brain cortical areas for the mental fatigue caused by long-term cognitive task, the variations of NLR coefficients of EEG rhythms under different mental fatigue level are sought out. The experimental results show that the NLR coefficients of EEG rhythms(More)
We assessed the effects of TAK-491 (a newly designed potent and selective ARB) alone and in combination with pioglitazone (PIO) on myocardial infarct size (IS). Rats received TAK-491 (0.3, 1, 3, or 10 mgkg−1d−1), PIO (1.0 or 2.5 mgkg−1d−1), or PIO 2.5 mgkg−1d−1 with TAK-491 (1 or 3 mgkg−1d−1) for 4 days. On day 5 rats underwent 30-minute coronary artery(More)
PURPOSE To evaluate the bioactivity of titanium surface treated by micro-arc oxidation (MAO) combined with ion beam assisted deposition (IBAD). METHODS Titanium surfaces were treated by machined(S0), micro-arc oxidation(S1) and micro-arc oxidation combined with IBAD(S2), respectively. The topography and roughness of surfaces were determined by(More)
PURPOSE To compare the effects of premolars restored with 2 different types of fiber post systems, so as to provide experience for restoration of residual crown of premolars. METHODS Fifty-three residual crowns of premolar restored with fiber post systems were collected, and randomly divided into 2 groups: parallel fiber post group and double taper fiber(More)
PURPOSE This retrospective study was set to explore the influence of local bone density (BD) on implant cumulative survival rates (ICSRs) and to assess prognostic factors associated with implant failure at sites with different BD. MATERIALS AND METHODS Between January 2005 and December 2011, 2,684 implants were placed in 1,377 patients and included in the(More)