Objective:To evaluate the effects of various tapers of canal preparations on the retention of cast posts in endodontically treated upper incisors in vitro.Methods: Forty human central or lateral maxillary incisors were prepared by removing the clinical crown at 1 mm above the approximal CEJ and treated the canals with instruments of varying tapers. The groups comprising 10 teeth of each group were divided as follows: Taper 0.02 /15~40#SS (stainless steel K-files) with step-back technique as control, PF (ProFile)OS 3#/0.06 with taper 0.06/PF 25#/ in apical third, PF OS 4#/0.07 with taper PF 0.06/30# in apical third, PF OS 5#/0.08 with PF taper 0.06/35# in apical third. Then, canals were filled with gutta percha and AH Plus sealer using vertical condensation technique with a level of 5 mm of gutta-percha left in the apical segment of the root. Metal cast posts were made by direct method and then the post was cemented with HY-BOND GLASIONMER CX (Shofu,Inc)cement. The roots were fixed in copper rings with mounting plaster and mounted on a WD-5A machine.The posts were subjected to gradually increasing vertical tensile force until dislodgment of the post occurred. Force (N) required to dislodge the post was obtained for each tooth, and the average force of the groups was compared using a one-way ANOVA and SNK multiple comparisons with SAS V8.1. Results:The highest resistance to dislodgment was obtained with PF OS 4#/0.07, whereas the lowest was obtained by the PF OS 3#/0.06. Nonstatistical difference was found between Taper 0.02 /15~40# and PF OS 3#/0.06. PF OS 4#/0.07 was statistically superior to Taper 0.02 /15~40# and PF OS 3#/0.06 but not PF OS 5#/0.08. Conclusion: The retention of posts is affected strongly with the increase in the diameter than with the increase in the taper angle. PF OS 4#/0.07 with taper PF 0.06/30# in apical third seems to be the best taper for maximal resistance to post dislodgment.

Objective To investigate the effect of vitamin D supplementation on biochemical imdexes and compliations in patients with type 2 diabetes(T2DM).Methods Two hundred and ten patients with type 2 diabetes of the People's Hospital of Chongli County were selected from January 2001 to January 2002.According to the envelope sampling method they were divided into vitamin D supplementation group of 105 people and not supplemented group of 105 people,and 105 healthy people at the same period as control group.Compared the biochemical baseline indicators differences.After 10 years of follow-up,the biochemical indexes and the complications were detected and compared again.Results After ten years follow-up,82 cases of supplementation group were followed up,78 cases of not supplemented group were followed up.The level of FPG and HbA1c of supplementation group and not supplementation group were higher than that of control group,the differernce was significant(P＜0.05).In supplement group,TG levels,25(OH) D3 concentrations and BMD values were (2.11±0.41) mmol/L,(16.88±5.02) μg/L and-1.15±(-0.25) respectively,and equal to the control group ((2.12 ± 0.38) mmol/L,(44.83 ± 21.25) mmol/L,-0.94 ± (-0.21)),and TG levels were lower than not supplemented group,25 (OH) D3 concentrations and high bone density higher than not supplemented group((24.53±15.61) mmol/L,-3.15±(-0.33),P＜0.05).FPG,Cr,BUN,UA,FIB,and BNP in supplement group were(10.00±2.32) mmol/L,(64.77±9.31) μmol/L,(6.41± 1.24) mmol/L,(339.83±43.74) mmol/L,(2.41±0.46) g/L and (588.92±73.69) ng/L,in not supplemented group were (15.60±2.51) mmol/L,(92.69±11.68).μmol/L,(8.70±2.35) mmol/L,(398.94±49.13) mmol/L,(2.89±0.54) g/L and (761.09±91.52) ng/L,all higher than those in control group ((5.01 ±0.59) mmol/L,(57.81±6.61) μmol/L,(4.52±1.11) mmol/L,(311.83±49.51) mmol/L,(2.00±0.31) g/L,(434.31 ± ±71.03) ng/L),and those indexes in supplement group all higher than in not supplemented group(P＜0.05).The level of HbA1c of supplement group and not supplemented group both higher than control group((11.32 ± ±2.03) ％,(13.22±4.17) ％ and (5.34±1.99) ％,P＜0.05).There were 45 cases in supplement group occurred diabetic nephropathy and cardiovascular complications,and 65 cases of not supplemented group (x2 =15.07,P＜0.05).Conclusion The relationship of Vitamin D and various complications of diabetes mellitus are closely,and supplementing vitamin D can reduce the complications of diabetes.

Objective:To investigate the stress distribution in peri-implant bone with All-on-4 implant with various parameters by three-dimensional finite element method.Methods:An edentulous mandibular specimen was scanned by CT Mimcs.Geomagic,Uni-graphics,HyperMesh modeling software were used to establish All-on-4 implant finite element models with different inclination angles and corresponding cantilever lengths.1 50 N vertical static load was applied at the right end of the cantilever,peri-implant bone stress was analysed using Abaqus software.Results:When the distal implant inclined 0°with cantilever length of 1 9.5 mm,the peak stress in peri-implant cortical bone at the mesial and distal side was 25.526 MPa and 83.026 MPa respectively.When the distal implant in-clined 1 5°,30°and 45°with the cantilever length of 1 7.2 mm,1 3.3 mm and 9.8 mm,the stress in perio-implant cortical bone at distal side of the implant reduced by 1 2.4%,35.6% and 53.1 %,that at mesial side of the implant reduced by 1 3.6%,36.3% and 40.2%,respectively.Conclusion:From the perspective of the stress analysis,the design of All-on-4 distal implant with large incli-nation angle and short cantilever is superior to that with small inclination angle and long cantilever.

Background Evaluation of acute myocardial infarction after reperfusion by dual phase contrast-enhancement multislice computed tomography (MSCT) was implicated in porcine model. There have been few attempts to use this diagnostic modality for the early assessment of coronary reperfusion in patients with ST-elevation myocardial infarction (STEMI), especially after primary percutaneous coronary intervention (PCI). In elderly patients with STEMI, the safety issues remain unknown. Methods Dual phase contrast-enhancement MSCT examinations were performed in 11 elderly patients (≥60 years old) with STEMI within one week after primary PCI. The presence, location and enhancement pattern on MSCT were evaluated. MSCT findings were compared with the catheter angiographic results and area under the curve of creatine kinase (CK) release. Serum creatinine level was recorded before and after MSCT scan. Results MSCT scans were successfully performed in all the patients. Early myocardial perfusion defect (early defect, ED) was detected in all of the 11 patients (100%) in the early phase of the contrast bolus (subendocardial ED in 10 patients and transmural in 1 patient). Mean CT attenuation value of ED was significantly different from CT attenuation value of remote myocardium (46±17 HU vs 104 ± 17 HU; P < 0.01). Location of ED area correlated well with infarction related artery territory on catheter angiography in all of the 11 patients (100%). On delayed phase of MSCT scan, different enhancement patterns were observed: isolated subendocardial late enhancement (LE) in 6 patients, subendocardial residual perfusion defect (RD) and subepicardial LE in 1 patient, subendocardial RD in 4 patients. Infarct volume assessed by MSCT correlated well with area under the curve CK release (R=0.72, P < 0.01). Serum creatinine level after MSCT scan showed no difference with that before MSCT scan. Conclusion Dual phase MSCT could be safely implicated in elderly patients with STEMI. Variable abnormal myocardial enhancement patterns were seen on dual phase MSCT in these patients with STEMI after primary PCI. Assessment of myocardial attenuation on MSCT gives additional information of the location and extent of infarction after reperfusion.

To establish a bioassay method and quality standard of Banlangen granula, agglutinated activity assay was used in the analysis of the traditional Chinese medicine, Banlangen granula. It showed that masculined effect could be picked up effectively and the products quality of different pharmaceutical factories and different batch numbers from the same factory could be revealed conveniently, accurately, quickly and directly with this method (valence value was between 2 and 11). The established bioassay method had a good reproducibility with RSD = 2%. The dependablity of the activity of red cell agglutination and restrainting influenza virus NA was conspicuous (r2 = 0.878 3). In conclusion, this bioassay method is suitable to control and evaluate the quality of Banlangen granula. Thus the method may provide a simple and effective technique in supervising and examining the quality of other traditional Chinese medicine.

To establish kinetic assay method for the analysis of hemolysis and to investigate dynamic hemolytic process of polysorbate 80. The UV-VIS spectrum of heme changes when hemoglobin is released continuously during the hemolytic process. Therefore, dynamic hemolytic curve was determined as a new way to characterize the kinetic process of interaction between polysorbate 80 and red blood cells. The effect of polysorbate 80 on blood cells could be perfectly investigated by the hemolytic dynamics. Dynamic hemolytic parameters of polysorbate 80 were calculated according to the hemolytic curves. The constants of hemolytic rate and maximum hemolytic rate of polysorbate 80 had fine linear relationships at the range of 1-20 mg x mL(-1) and 5-20 mg x mL(-1), respectively. In comparison with the present official method such as macroscopic observation and static spectrophotometric methods, kinetic spectrophotometry has the advantages of real time, on-line determination, sensitive, objective, good reproducibility and 2-dimensional information acquired. Therefore, as a biological technique, kinetic spectrophotometry could be applied to evaluate the quality of polysorbate 80 and to screen other solubilizing excipients.

Objective To identify the effect of glucose regulating protein 75 expression in PC12 cells under glucose deprivation.Methods MTT method was used to monitor the cell viability.The leakage of LDH was represented as the index of cell injury.Flow cytometry was applied for cell cycle analysis,apoptosis and necrosis.Using RT-PCR detected and quantified mRNA.Western blot to measure relative amounts of the protein.Results Cell viability decreased and the LDH leakage increased.While the treated PC12 cells had two main forms of apoptosis and necrosis.GRP75 mRNA and protein levels were upregulated.Conclusion GRP75 has protective function during glucose deprivation.

This paper is aimed to provide the methods of quality control and bioassay of traditional Chinese medicine injections including bioassay method. Shuanghuanglian freeze-dried powder for injection (SFPI) was chosen as study object. HPLC-ELSD fingerprints of SFPI had been established and the samples were differentiated by similarity calculation. Meanwhile, biological profiles of SFPI on Escherichia coli had been established by microcalorimetry. The similarity values were calculated using the correlation coefficient, based on quantitative thermo-kinetic parameters (T2m, Tj, I%). The results indicated that HPLC-ELSD fingerprints, which showed content changes of chemical components, could not monitor minimal variation of different samples, especially that of biological pollutants, while biological profiles could sensitively detect antibiotic activity alterations of the samples, which were kept under specific conditions. In conclusion, characterized by two-dimension, microcalorimetry could supply thermograms as biological profiles characterized to describe the bioactivity of drugs. This study could clearly demonstrate that the correlative detection was proposed as an efficient strategy for quality control of SFPI, based on HPLC-ELSD fingerprints and biological profiles, which could detect quality fluctuation of samples early and quickly and predict the potential adverse drug events (ADE) for ensuring clinical safety.

Objective To evaluate the utility of multi-slice computed tomography (MSCT) in assessing acute non-reperfused myocardial infarct size. Methods Seven domestic pigs (mean weight 17.3 ± 1.9 kg) underwent ligation of the distal left anterior descending artery to establish a model of acute myocardial infarction (MI). MSCT and triphenyltetrazolium chloride (TTC) staining were performed two hours later. The following data were acquired and analyzed:MI volume (%), CT values of the infarcted region, left ventricular cavity and normal cardiac tissue at various scanning time-points (1, 5, 10, 15, 20 min after contrast injection). Results Using MSCT, the overall MI volume showed a time-dependent decrease, with a reduction of 28.87%after 20 min. The greatest reduction occurred at the 5 min time-point. In TTC staining, MI volume was 9.87%± 2.44%. When MI size, as determined by MSCT, was compared with that by TTC staining in Bland-Altman plots, there was a better agreement at 5, 10, and 15 min time-points at 1 and 20 min. Conclusions The study indicates that double-phase scanning examination using MSCT is a useful tool to assess MI size, and the optimal late-phase scanning time-point set within 5-15 min of contrast injection.

Aim To investigate the effect of non-T cell binding peptide(FNS007)on collagen type Ⅱ-induced arthritis(CIA)in mice and the possible mechanisms.Methods The CIA model was induced by intradermal injection of bovine CⅡ+Freunds adjuvant.At the clinical onset of CIA,mice were randomly divided into 6 groups: blank control group(Control),model group,ORENCIA(abatacept)group,FNS007 low dose(1.2 mg·kg-1)group,FNS007 middle dose(2.4 mg·kg-1)group and FNS007 high dose(4.8 mg·kg-1)group.FNS007 was given by intravenous injection on the first day of arthritis and every other day until the study was terminated on d 28 after injection of the drug.The paw thickness and the ankle joint width were measured,and the arthritis scores were recorded.At termination,interferon-γ(IFN-γ),tumor necrosis factor-α(TNF-α),interleukin-6(IL-6)and level of anti-CⅡ antibody in serum were examined by enzyme-linked immunosorbent assay(ELISA).Bone injury was analyzed by X-ray imaging,and HE staining was conducted to observe the histopathologic changes and pathological score of ankle tissues.Results CIA models were successfully induced.Compared with CIA group,FNS007 high dose significantly reduced the paw thickness and the ankle joint left-right diameter,lowered arthritis scores in CIA mice,reduced serum concentrations of IFN-γ,IL-6 and anti-CⅡ antibodies,and lowered the radiographic and histologic scores.Compared with CIA group,FNS007 middle dose group showed marked reduction in the arthritis scores,IL-6 content in serum,and inhibion in the radiographic and histologic scores.The arthritis scores,concentration of IFN-γ,the radiographic and histologic scores were significantly reduced in FNS007 low dose group compared with those in model group.Conclusion FNS007 can effectively inhibit the progression of CIA through inhibiting T-cell activation and reducing inflammatory cytokines,anti-CⅡ antibodies,and histoclasia and bone destruction.