Objective: To study the effect of cementation materials on the fracture resistance of metal free premolar Artglass crown. Methods: Thirty extracted human maxillary premolars were regularly prepared for cementation. Artglass crowns were cemented onto the teeth with zinc phosphate cement (ZnP), glass ionomer cement(GIC)or a resinous cement in combination with a dentinal bonding agent. Each of the cementation material was applied in 10 premolars. Artificial crowns were vertically loaded until the Artglass crowns compressed to failure. Significant differences of fracture loads between experimental groups were assessed by paired t test. Results: The fracture load(N) of ZnP, GIC and resinous cement were 1 743.1 ?383.4, 1 682.4?613.7 and 2 226.9?270.1 respectively( P

Objective To evaluate the therapeutic effects of the integration of impaction bone grafting reconstructing femur trochanter and femoral head arthropalsty in the treatment of unstable intertrochanteric fractures in aged patients. Methods From January 2006 to December 2008,21 cases unstable intertrohanteric fractures with serious osteoporosis were treated with impaction bone grafting reconstructing the femur trochanter and femoral head arthropalsty. Results Functional assessment based on the Harris score ,great in 14 cases, good in 5 cases, medium in 2 cases. The excellent and good rate was 90. 4%. Conclusion The integration of impaction bone grafting reconstructing femur trochanter and femoral head arthropalsty is convenient to treat unstable intertrochanteric fractures in aged patients.

Objective To study the impacts of B7-H3 molecule on the proliferation of T lymphocytes in different activation conditions and on the secretion of relevant cytokines.Methods Peripheral blood samples were collected from healthy subjects to separate peripheral blood mononuclear cells (PBMC) by Ficoll density gradient centrifugation.T lymphocytes were isolated from some of the PBMCs and purified with T Cell Enrichment Kit.PBMC and purified T lymphocytes were activated by anti-CD3/CD28 monoclonal antibodies (McAb) in vitro.Flow cytometry analysis was used to detect the expression of CD28 and CTLA-4 on T lymphocytes at different time points for further analyzing the activation states of T lymphocytes.On this basis, human B7-H3-Fc fusion protein was added into the mixed co-cultivation system on days 0, 1, 2, 3 and 4, and Hu-Fc fusion protein was used as isotype control.CCK-8 method was performed to detect the proliferation of T lymphocytes in each group.ELISA method was used to detect the secretion of cytokines (IL-2, IL-10 and IFN-γ) and to analyze the immune responses induced by stimulating T lymphocytes at different states of activation with B7-H3.Results B7-H3 molecule significantly inhibited the quiescent T lymphocytes from secreting IL-2 and IL-10, but had no significant impact on IFN-γ secretion.Moreover, it significantly promoted the activated T lymphocytes to secret IL-2 and IFN-γ, but had no obvious impact on IL-10 secretion.Results of the cell proliferation assay showed that B7-H3 molecule inhibited the in vitro proliferation of T lymphocytes in the PBMC, but had no obvious impact on purified T lymphocytes.ConclusionThe regulatory effects of B7-H3 molecule on the immune functions of T lymphocytes vary with the activation states of T lymphocytes.

Objective To investigate the effect of acupuncture combined with human amniotic mesenchymal stem cells ( HAMCs ) transplantation on the osteoporosis in ovariectomized rats.Methods Forty-five healthy female non-pregnant Wistar rats were randomly divided into sham operated group, model group and experimental group ( acupuncture+HAMC transplantation), 15 rats in each group.At 7 days after the surgical wound healing, the rats received acupuncture every day and intravenous injection of HAMCs suspension ( except the sham operated group) once a week for consecutive 12 weeks.The body weight was measured every week.24 hours after the last intervention, the rats were killed and specimens were collected.Specimens of the mid-, proximal-and distal femur were taken to measure the bone mineral density using a dual energy X-ray absorptiometer.At 12 weeks after the intervention, changes of the expression of serum 25-hydroxy-vitamin D (25-HVD), C-terminal peptide of type I collagen (CTX-I), bone specific alkaline phosphatase ( BAP) and human tartrate-resistant acid phosphatase 5b ( TRACP 5b) were determined by ELISA, the biomechanical properties of the removed femur was measured, and the expression of transforming growth factor-β( TGF-β) in the vertebrae was assessed by RT-PCR assay.Results Body weight of rats in the sham operation group was increased gradually in accordance with the natural growth of animals, that of the model group was significantly higher than that of the sham operated group since two months after modeling, and the body weight of the experimental group was similar to that of the sham operated group.The bone mineral density and calcium content of the model group were significantly decreased compared with that of the sham operated group ( P<0.05) , and the bone mineral density and bone calcium content of the experimental group were significantly higher than that of the model group ( P <0.05 ) .The ELISA showed that the expressions of serum 25-HVD, CTX I, BAP, and TRAP5b in the model group were significantly lower than that of the sham operated group, and those of the experimental group were significantly higher than that of the model group ( P<0.05 ) . Measurement of biomechanical properties showed that the limit load, limit stress and elastic modulus of the femur of the sham operated group were significantly higher than that of the model group ( P<0.05 ) , and the limit load and elastic modulus of the experimental group were significantly higher than that of the sham operated group ( P <0.05 ) .T-PCR showed that the expression of TGF-β1 m-RNA in the experimental group was significantly up-regulated than that of the sham operated and model groups ( P<0.05) .Conclusions Acupuncture combined with human amniotic mesenchymal stem cell ( HAMCs) transplantation has a synergistic effect on the treatment of osteoporosis, and can improve the conditions in ovariectomized rats.

BACKGROUND:Panax notoginseng saponins promotes bone repair by improving vascular proliferation. Therefore, the scaffolds carrying panax notoginseng saponins were supposed to be used to improve bone repair at the bone defect region. However, the biocompatibility of scaffolds remains unclear.
OBJECTIVE:To evaluate the biocompatibility of panax notoginseng saponins-hydroxyapatite/chitosan scaffolds.
METHODS:A new bone repair scaffold has been generated by thoroughly mixtures of 0, 0.1, 1, 10 mg panax notoginseng saponins and chitosan/hydroxyapatite using in-situ composite technique and freeze-drying technique. Morphology and mechanical property of the scaffold were observed under a scanning electron microscope. (1) Cel proliferation test:rabbit bone marrow mesenchymal stem cel s of passage 3 were cultured in four kinds of drug loaded hydroxyapatite/chitosan composite material leaching liquor. Cel s normal y cultured were considered as controls. 3-(4, 5-Dimethylthiazol-2-yl) 2, 5-diphenyl tetrazolium bromide was used to measure absorbance value of cel s in each group. (2) Hemolysis test:Rabbit anticoagulated blood was added with four kinds of drug loaded hydroxyapatite/chitosan composite material leaching liquor. Absorbance values were measured using a microplate reader in each group. (3) Pyrogen test:The four kinds of drug loaded hydroxyapatite/chitosan composite material leaching liquor and saline were respectively injected into ear vein of rabbits, and the increase of rabbit body temperature was detected.
RESULTS AND CONCLUSION:Drug loaded hydroxyapatite/chitosan composite material contained three dimensional porous structure of 110μm in diameter. Drug loading process of panax notoginseng saponins did not significantly affect the porosity, pore size and density of the composite material, but decreased its breaking strength and elastic modulus. The larger amount of drug loading showed a more obvious effect. Simple hydroxyapatite/chitosan composite material had good cel ular compatibility. The composite material after drug loading obviously suppressed cel proliferation, and the larger amount of drug loading showed a more obvious effect. The composite material had good blood compatibility before and after drug loading. The composite material had good pyrogen effects before and after drug loading, but accorded with acceptable quality level of pyrogen test.

Objective To understand the functional exercise situation of the total hip arthroplasty(THA)patients in hospital. Methods Using self-designed functional exercise in patients with TKA outline the structure of observation, observation and collection of Orthopedic Surgery,71 cases (91 hips)received THA in patients with relevant information. Results After the former 3d,22.5% of patients did not exercise;After 14 d continuous passive motion (CPM) ,hip joint exercises were separately accounted for 71.8% and 81.7% ,and static muscle contraction,straight leg raising were accounted for 40.8 percent and 81.7 percent. The four exercise started lately, training methods were not standardized the patients, insisted on a shorter time;single-and double-hip replacement hip replacement in patients with Shimoji routing practice started time respectively, after (6.51 ± 2.90 ) d and ( 10.30 ± 3.21 ) d. In the functional exercise process,CPM was assisted by nurse,in other exercises was assisted by retaining workers and patients families. Conclusion THA patients hospitalized during the actual exercise of the number,frequency,timing and methods vary, nursing staff should be further explored how to ensure that patients really effective rehabilitation exercise to further enhance the effect of patients with rehabilitation exercises.

Objective To investigate the correlated factors of compliance to dietary therapy in hyperuricemia patients.Methods 388 hyperuricemia patients were investigated with the questionnaire developed by ourselves.Results 119 cases(31.6%)complied to the dietary control program,and 257 cases(68.4%)didn't controlled food and drink or controlled disqualification.The compliance to alimentary control of hyperuricemia patients was correlated intimately with family history,occupation,the degree of nosography,heathy education,propaganda of the masses media,family supporting and satisfaction.Conclusion The alimentary control compliance and related knowledge about dietary therapy of hyperuricemia of hyperuricemia patients were poor.The alimentary control compliance was better in patients with more serious illness,more heathy knowledge,more family supporting,more propaganda of the masses media and more satisfaction.

Based on a discussion on PACS and the way its image workstation obtains scanned sequential images, this paper presented a method of 3D surface construction and visualization on PACS workstation. Guest/Server structure was used between PACS application entities. Image storing and transmission were realized by service classes established by DICOM standards. Relation database was used to arrange the stored sequential images. Image workstation transformed the sequential images obtained from PACS net into volume data field. 3D reconstruction and rendering results were obtained by using surface-rendering and volume-rendering methods, which made the 3D construction results acquire vivid 3D structure details of high fidelity and strong sense of reality. 3 sets of application results were also presented in this paper.
Humans ; Image Processing, Computer-Assisted ; methods ; Imaging, Three-Dimensional ; Magnetic Resonance Imaging ; Radiology Information Systems ; Tomography, X-Ray Computed ; User-Computer Interface

Objective To compose and evaluate the measurement uncertainty of two kinds of chemiluminescence detection system using different methods.Methods The measurement uncertainty was composed by 4 different methods:(1) U 1％ was composed of within-run CV(CVw ％),between-run CV(CVB ％)and bias (CVBias ％);(2) U2％ was composed of CVB ％ and uncertainty of calibration (CVcal ％);(3) U3％ was composed of CVW％,CVs％ and CVcal％;(4) U4％ was composed of CVW％,CVB％,CVBias％ and CVcal％.The measurement uncertainty of Architect i2000SR system (Abbott,USA) and DXI800 system (Beckman,USA) was assessed.Pearson correlation analysis,Spearman correlation analysis,Paried t test and Mann-Whitney u test were performed to analyze the data.Results For Architect i2000SR system,U1％,U2％,U3％ and U4％ were significantly correlated (r=0.727-0.988,all P＜0.05),U3％ and U2％ were significantly different (t =6.88,P＜0.05),U4％ and U1％ were significantly different (t =6.21,P＜0.05).For DXI800 system,U1％,U2％,U3％ and U4％ were also significantly correlated (r =0.608-0.975,all P＜0.05),no significant difference was found between U3％ and U2％ (z=-1.33,P＞0.05),or between U4％ and U 1％ (z =-1.04,P＞ 0.05);the expanded measurement uncertainty was correlated with CVW％,CVB％,CVBias％(rs=0.653-0.912,all P＜0.05),but not with CVcal％(rs=0.548,P＞0.05).Conclusions For Architect i2000SR system,the fourth method is more proper to compose the measurement uncertainty (U4％).For DXI800 system,the first method is more appropriate (U1％).According to the contribution of different components to the measurement uncertainty,the measurement quality could be improved by reducing the imprecision and bias.

BACKGROUND: There are many species of ceramic bonding systems supplied in market, the mechanical strength is aprerequisite condition for resin cement in clinical use.OBJECTIVE: To study the difference of mechanical strength between Panavia F resin cement and self-made resin cement,DESIGN, TIME AND SETTING: A controlled observational study was performed in the prosthesis laboratory of the FourthMilitary Medical University of Chinese PLA between May 2006 and March 2007.MATERIALS: Panavia F resin cement was sourced from KURARAY MEDICAL INC. (Japan), experimental resin cement wasproduced by College of Stomatological Medicine in the Fourth Military Medical University of Chinese PLA.METHODS: Five cylindrical compressive strength specimens at an 8-mm height and 4-mm diameter were prepared, as well as5 cylindrical diametral tensile strength specimens at a 3-mm height and 6-mm diameter. AGS-500 universal material testingmachine was applied to detect the compressive strength and diametral tensile strength.MAIN OUTCOME MEASURES: The diametral tensile strength test and compressive strength test of the specimens.RESULTS: The compressive strength of Panavia F resin cement was remarkably higher than that of experimental cement[(238.92±24.54), (149.08±12.13) M Pa, P ＜ 0.05]. There were no significances between two resin cements on diametral tensilestrength (P＞ 0.05).CONCLUSION: There were no significance between two resin cements on diametral tensile strength following completecuring. The compressive strength of experimental resin cement can reach the standard of ADA (＞ 70 MPa) although it is lowerthan the compressive strength of Panavia F resin cement.