Objective:To investigate the effects of different impl an t diameter on stress distribution in implant bone interface. Method: The stress and strain in implant bone interface for implants with di fferent diameter (3.0 mm,3.75 mm and 5.0 mm), and with 1.47 N loading mesiodist ally were analyzed by 3 dimesion finite element analysis method. Re sults:The Von mises stress (MPa)at cervix of the implants with the diameter (mm) of 3.0, 3.75 and 5.0 were 0.807,0.533 and 1.080;the alveolar bone displacement (?m) at the cervix of the implants 0.232,0.163 and,0.111 respe ctively. Conclusion: The implant with 3.75 mm diameter is more suitable for orthodontic anchorage.

Objective To study the effect of continuous positive airway pressure(CPAP) therapy for 56 clinical cases neonatal a-cute respiration prostration. Methods Based on the traditional treatment,CPAP assistant therapy were taken on 56 cases. The pressure of CAPA were adjusted according to the variations of clinical condition and blood gas value. Results After 6 - hour assistance of CPAP performance, the symptom of all cases had been abated, pa (O2) was increased, the normal CPAP applaying time was 28 hoours. The remarkable difference had been found compared to those in no CPAP practice(P

Objective To illustrate the evaluation effect of bivariate analysis of sensitivity and specificity meta-analysis model in diagnosis test to provide basis for selecting better evaluation method of diagnostic test.Methods Bivariate model was presented by reanalyzing the data from a published meta-analysis of two diagnostic techniques in diagnosis of schistosomiasis japonica.Results The bivariate model could directly provide summary estimates of(logit)sensitivity,specificity and DOR with corresponding 95% CI for two diagnostic tests(IHA and ELISA).Also,it could elicit any significant difference that existed among sensitivity,specificity and DOR between the two diagnostic methods,and incorporate any correlation that existed between sensitivity;specificity.Conclusion The bivariate model preserves the two dimensional nature of the original data,and separates effects of sensitivity and specificity,which is more rational than a net effect on diagnostic odds ratio scale as in SROC approach.The bivariate model is appropriate and agile,and can be used as an extension and improvement of the traditional SROC method.

Objective: To investigate the effect and mechanism of helix B surface peptide (HBSP) on myocardial ischemia reperfusion injury (MIRI) in experimental mice.
Methods: The MIRI model was established by ligation of anterior descending coronary artery of the mice for 45 min and followed by corresponding treatment at 5 min before reperfusion. A total of 64 male ICR mice were randomly assigned to 4 group:①Sham group,②MIRI group, the mice received normal saline at 5 min before reperfusion,③HBSP group, MIRI mice received HBSP at 5 min before reperfusion and④HBSP+PD98059 group, MIRI mice received PD98059 (a speciifc blocker of ERK1/2) at 20 min before reperfusion and followed by HBSP at 5 min before reperfusion.n=16 in each group, all animals were treated for 2 hours. The area of myocardial infarction (MI) was detected by TTC-EB double staining method, the myocardial apoptosis rate was examined by TUNEL method, the levels of protein expression of ERK1/2 and phosphorylation of ERK1/2 were measured by Western blot analysis.
Results: Compared with MIRI group, HBSP group presented decreased MI area, decreased myocardial apoptosis rate and increased phopsphorylation level of ERK1/2, allP<0.05. Compared with HBSP group, HBSP+PD98059 group showed decreased phopsphorylation level of ERK1/2, increased myocardial apoptosis rate and increased MI area, allP<0.05.
Conclusion: HBSP may reduce the MI area via inhibiting myocardial apoptosis and therefore, protecting the experimental mice from MIRI; the mechanism might be related to the activation of ERK1/2 pathway.

To test the hypothesis that the controlled reperfusion of warm blood cardioplegiacontaining mannitol would result in more effectively improved recovery of myocardial function by prevent-ing or reducing a potentially harmful component of reperfusion. Methods: Thirty-two cats were divided in-to four groups. Group Ⅰwas not subjected to ischemia or reperfusion injury. Group Ⅱ was subjected to60 min hypothermic ischemia. Group Ⅲwas subjected to 60 min hypothermic ischemia and 60 min reperfu-sion. Group Ⅳ was controlled reperfusion with warm blood cardioplegia containing mannitol. Results:Myocardial functlon was significantly depressed after 60 min reperfusion- Increased myocardial water con-tent and low ATP c0ntent were observed also. Controlled reperfusion with warm bl0od cardioplegia con-taining mannitol was helpful to improve the recovery of myocardial function and ATP content, and to re-duce the myocardial water content. Conclusion: These results indicate that controlled reperfusion after is-chemia provides benefit in avoiding myocardium from reperfusion injury.

Objective To explore the possibility of three-dimensional (3D) kidney replications for clinical and teaching of percutaneous nephrolithotomy (PCNL).Methods The CT urography (CTU) DICOM format data from 5 patients with kidney calculi were selected from March 1st to June 1st,2015.Thresholding technique,region growing technique,edit mask technique and multiple slice edit technique were used in sequence by Mimics software.And five 3D replications were printed by Object 500 3D printer.The sizes of the replications were measured and the replications were punctured.Results The 3D replications of the kidneys were successfully designed and printed.The average difference of the long axes between 3D replications and patients' kidneys was 0.283cm,the average difference of the diameters was 0.212cm,and the average difference of the diameter of the stones was 0.244cm.The sizes of the 3D replications were basically consistent with those of patients' kidneys.The simulative puncturing was successful.Conclusions After comparing the 3D replications with their original 2D CT images,the anatomical details are found basically the same.The 3D replications could provide 3D visual observations of organ anatomy for surgeons.

Objective To investigate the effect of low-dose glucocorticoid on prognosis of critical illness-related corticosteroid insufficient (CIRCI) patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD).Methods A total of 385 eligible patients met the criteria of AECOPD were admitted from January 2010 to December 2012.The AECOPD patients co-morbid with CIRCI screened by an adrenal corticotrophic hormone test within 12 hours after admission were randomly divided into treatment group (n =32) and control group (n =31) for prospective,randomized (random number) and controlled clinical study.Hydrocortison (150mg/d) for treatment group or normal saline instead for control group was injected intravenously for 7 days.The 28-day mortality,shock-free days,length of ICU stay within 28 days and ventilator-free days were evaluated.And the markers of inflammation C-reactive protein,tumor necrosis factor-α,interleukin 6 and procalcitonin were measured before and 7 days after treatment.The variables were analyzed by Student' s t-test,non-parametric statistical test,Chi-square test or KaplanMeier test with SPSS 18.0 statistic software.P ＜ 0.05 was considered statistically significant.Results A cohort of 385 patients with AECOPD was screened,and the prevalence rate of CIRCI was 16.4％.The shock rate was higher in the AECOPD patients co-morbid with CIRCI than that in the AECOPD patients without CIRCI (23.8％ vs 8.7％,P ＜0.01).Compared with the control group,the 28-day mortality was significantly lower in treatment group (2/32 vs 8/31,P ＜ 0.05),and shock-free days within 28 days longer in the treatment group (18.2 ± 9.5 vs 25.8 ± 4.1,P ＜ 0.05).However,there was no difference in the shock rate,days of ICU stay and ventilator-free days between the two groups.After treatment,the levels of infection markers were decreased and obviously lower than those in control group (P ＜ 0.01),such as Creactive protein (13.2 ± 5.5 mg/L vs 8.3 ± 3.1 mg/L for control group; 13.5 ± 5.9 mg/L vs 5.1 ± 2.3mg/L for treatment group),tumor necrosis factor-α (26.1 ± 16.2 μg/L vs 17.5 ± 11.7 μg/L for control group ; 25.0 ± 14.8 μg/L vs 10.4 ± 7.8 μg/L for treatment group) and procalcitonin [3.88 (0.25,8.5) μg/L vs 2.03 (0.15,5.1) μg/L for control group; 3.77 (0.21,8.0) μg/L vs 1.26 (0.10,3.2) μg/L for treatment group],furthermore,the levels of infection markers were decrease more obviously in the treatment group than those in the control group (P ＜ 0.01).Conclusions There was high prevalence rate of CIRCI in the patients with AECOPD in the department of critical medicine,and low-dose glucocorticoid reduced 28-day mortality,shock days and markers of infection and inflammation.

Objective To evaluate the preliminary outcome of stable vitiligo treatment with ReCell(R )technique.Methods Six patients with stable vitiligo were treated with ReCell(R ) technique.In each patient,a thin razor-thickness cutaneous biopsy was harvested from uninvolved area near the vitiligo patches.It was then processed through the ReCell(R ) system and 1 ml autologous epidermal cell suspension was obtained.The lesion area was dermabraded using a diamond fraise wheel to the dermoepidermal junction.The cell suspension was then sprayed on the wound and covered with non-adhering dressings.Results The patients were followed up for 6 months.5 patients presented with repigmentaion in the treated area.There was no significant response in one patient who was diagnosed as systematic vitiligo.Conclusions The ReCell(R ) technique is an alternative treatment for stable vitiligo patients.The clinical outcome will be satisfactory when appropriate patients are selected.

Objective To evaluate the value of percutaneous transhepatic angioplasty in treatment of portal vein stenosis (PVS) after pediatric liver transplantation.Methods The data of 8 pediatric patients with PVS after liver transplantation were retrospectively evaluated.All cases were confirmed by portal vein angiography,and were treated with percutaneous transluminal angioplasty and/or percutaneous transluminal stent angioplasty.The effect of endovascular interventional therapy in 8 cases was analyzed.Results A total of 12 times of 8 patients received endovascular interventional therapy.The success rate was 66.67％ (8/12).The clinical success rate of the first treatment was 62.50％ (5/8).Three cases were treated with balloon dilation after the first balloon dilation,and there was no recurrence of PVS after operation in 2 cases.After the treatment of balloon dilation,stent angioplasty was performed in 1 case.There were no complications related to treatment in 8 cases.Conclusion Endovascular interventional treatment is a safe and effective way for PVS after pediatric liver transplantation.

ObjectiveTo investigate the expression and activity of histone deacetylase (HDAC) in prostate cancer.Methodshe pathological samples of 37 cases of PCa were collected. The mean age of the patients was 73 (53 - 88 ) years, the preoperative t-PSA was 81.69 ( 3.13 - 2000 ) ng/ml, Gleason score: 13 cases were ≤7, 24 cases were ＞7. Twenty-seven cases of BPH were set as controls. The mean age of the BPH patients was 69 (52 - 84) years, the preoperative t-PSA was 10.93 ( 1.11 - 55.07 ) ng/ml.Western blotting and colorimetric Assay kits were used to determine the HDAC expression and activity. The difference of HDAC activity in benign prostatic hyperplasia and prostate cancer was statistically analyzed.The correlation of the HDAC expression level and values of PSA and Gleason score was also assessed.ResultsHDACs were over-expressed in most cases of prostate cancer, the expression rates were HDAC1 :57％, HDAC2: 68％, HDAC3: 84％ and HDAC4: 73％, respectively. The HDAC activity (P ＜0.05)was significantly different between the prostate cancer and benign prostatic hyperplasia groups. The expression level of HDAC did not correlate with the values of PSA and Gleason score.ConclusionsHDAC was highly expressed and strongly active in prostate cancer. The results suggest that HDAC might be a potential target for the management of prostate cancer patients.