BACKGROUND: Poly methyl methyacrylate (PMMA) has been widely used as a denture base material in dental field for a long time. However, the fracture of acrylic resin dentures is an unresolved problem in prosthodontics. Therefore, how to improve the flexural strength of repaired denture seems to be extremely important. OBJECTIVE: To study the effect of embedding different amounts of metal wires on the flexural strength of repaired denture bases. METHODS: Twenty-five rectangular specimens (50 mm× 30 mm × 2.5 mm) were fabricated using heat-cured acrylic resins and randomly and evenly divided into five groups: A, B, C, D, and E. All specimens were fractured through the use of universal testing machine, and the flexural strengths were tested. Following preparation of fracture surfaces, one to four metal wires were separately embedded in the groups B, C, D, and E. No metal wires were embedded in the group A. All fractured specimens were repaired using self-curing resins. The flexural strengths were measured again using the same testing machine, and the percentages of strength recovery were calculated. RESULTS AND CONCLUSION: After repair, the flexural strengths were obviously reduced (P < 0.01). Compared to group A, the percentages of strength recovery were significantly increased in groups C, D, and E (P < 0.05). There was no significant difference in the percentage of strength recovery among groups C, D, and E (P > 0.05). These results indicate that embedding two to four metal wires can improve the flexural strength of denture bases.

ObjiectiveTo investigate the clinical efficacy of Chinese medicineShuxin-Huoxue decoction on coronary heart disease and angina pectoris.MethodsThis study was a randomized controlled trial. 86 patients with coronary heart disease and angina pectoris and conformed to the indusive criteria were randomly divided into a control group and a treatment group, with 43 cases in each group. The control group was treated with conventional western medicine, the treatment group was treated with traditional Chinese medicineShuxin-Huoxue decoction. Serum homocysteine (Hcy) was measured by enzymatic cycling assay, high sensitive C reactive protein (hs-CRP) was measured by immunotubidimetric assay and left ventricular ejection fraction (LVEF), stroke volume (SV), cardiac output (CO), cardiac index (CI) were measured by color doppler echocardiography before and after treatment. The clinical effect of the two groups was evaluated.ResultsThe total effective rate of the treatment group and the control group was 90.7% (39/43) and 74.4% (32/43) respectively,there was significant difference (χ2=3.957,P=0.047). Followed up for 4 weeks, LVEF(65.7% ± 8.7% vs. 61.5% ± 8.4%,t=2.277), SV(86.9 ± 16.8 ml vs.79.2 ± 16.5 ml,t=2.144), CO(49.3 ± 9.1 ml/m2 vs. 44.7 ± 8.8 ml/m2,t=2.383), CI (3.7 ± 0.9 L/min?m2 vs. 3.3 ± 0.7 L/min?m2,t=2.301) of the treatment group were significantly improved after treatment than those of the control group (P<0.05), and the decrease of serum Hcy  (8.7± 3.7mmol/L vs. 11.4± 3.5mmol/L,t=3.476), hs-CRP (2.7± 1.1 mg/L vs. 3.5± 1.3 mg/L,t=3.081) level of the treatment group were better than those of the control group(P<0.01).ConclusionTraditional Chinese medicineShuxin-Huoxue decoction has good therapeutic effect on coronary heart disease and angina pectoris.

Objective Study the special value of the brainstem auditory evoked potential(BAEP)and Brain Geography Diagram(BEAM/EEG)for diagnosis of Newborn HypoxicIschemic Encephalopathy(HIE),the correlation between BAEP,BEAM/EEG and HIG,and the relation with HIE linger effect,so as to evaluate clinical curative effect,find out the best treatment time,lower the occurrence of linger effect.Methods the BEAM/EEG and BAEP were detected synehronously by adopting 16 traots of BEAM/EEG and BAEP instruments for HIE before treatment,at thirtieth day,the third Month,the sixth Month,the twelfth Month and the twenty-fourth Month respectively.Results The BAEP,BEAM/EEG have special diagnostic value on nerve cell function recovery,examination of recovery period in particalar.The research discovers the both are not synehronous in recovery period,the BAEP recovers is later than BEAM/EEG;for heavy degree HIE,BAEP recovering is slow with bad therapy effect,BAEP index sign is more sensitive to BEAM/EEG to assess linger effect.Conclusions Simple BEAM/EEG damaye indicates the brain cortex iniury only,so the prognosis is good;while BAEP damage suggestes the patiemts have brain stem nerve cell injury simultaneously,with bad prognosis for the heavy degree abnormality.in combination with BAEP and BEAM/EEG in clinical practiae,investigation of recovery degree of HIE herve cells by kinds of electric physiology angles it would have important value to perfect the treatment of HIE.

Objective To observe the effect of metformin and exercise therapy for IGT. Methods 86 patients with IGT were given metformin and exercise therapy,the range of glucose,BMI and symptoms improvement were observed before and after the therapy. Results After 6 months therapy,the fasting blood glucose and 2 h after oral administration of 75 g glucose levels were significantly reduced(P＜0.01＝,BMI reduced(P＜0.05＝.72 cases (83.7%)were back to normal glucose tolerance,14 cases maintained IGT(those unable to adhere to exercise and no diet controlled),0 case became DM. Conclusion Metformin and exercise therapy had good efficacy in curing IGT.

OBJECTIVETo investigate the nerve growth factor (NGF) regulating the expression of calcitonin gene-related peptide (CGRP) in promoting the proliferation of osteoblast-like cell (MG-63) and thus illustrate the mechanism of the NGF in wound healing.

METHODSDifferent concentrations of NGF were used to stimulate MG-63. The expression of CGRP was detected by real-time quantitative polymerase chain reaction (RT-QPCR) and enzyme-linked immunosorbent assay after 1, 2, 3, and 4 days. The proliferation of MG-63 was detected by cell counting kit-8 (CCK-8). The expression of CGRP mRNA and the proliferation of MG-63 were then detected by RT-QPCR and CCK-8 after adding the NGF receptor blocker.

RESULTSCompared with the blank control group, the expression of CGRP significantly increased by stimulating the NGF. The expression of CGRP was positively related to the concentration of NGF (P<0.05). Moreover, the expression of CGRP increased by prolonging the NGF stimulation time. The proliferation of MG-63 increased after stimulating the NGF (P<0.05). After adding the NGF receptor blocker, the expression of CGRP and the proliferation of MG-63 correspondingly decreased (P<0.05).

CONCLUSIONNGF can up-regulate the expression of CGRP and increase the proliferation of MG-63. Therefore, NGF plays a significant role in wound healing.

Animals ; Calcitonin ; Calcitonin Gene-Related Peptide ; metabolism ; Cell Line ; Ganglia, Spinal ; Humans ; Nerve Growth Factor ; metabolism ; Rats, Sprague-Dawley ; Receptor, Nerve Growth Factor ; Signal Transduction ; Up-Regulation

Objective:To explore the influence of different cell culture methods in the genome-wide DNA methylation status of breast cancer MDA-MB-231 cells,and to clarify the relationship between genome-wide DNA methylation status and cell growth environment and the role of genome-wide DNA methylation status in the occurrence and development of tumor.Methods:The MDA-MB-231 cells were cultured with 2D and 3D cell culture models and mouse orthotopic transplantation model (Ti model)and collected, then DNA was extracted by DNA extraction kit and the genome-wide DNA methylation status of MDA-MB-231 cells after cultured with three different culture methods was detected by DNA methylation chip,then the value of beta,DiffScore and Delta_Beta of the CpG loci of each gene were calculated by applying Genomestudio software, and the differential methylation genes were screened by Genomestudio software and GO and Pathway analysis of these genes were performed in DAVID on-line analysis tool.Results:All 480 genes of the MDA-MB-231 cells showed significant differences in the degree of methylation in 3D and 2D models (P<0.05);86 448 genes in 3D and Ti models (P<0.05);90 005 genes in Ti and 2D models (P<0.05).The differential methylation genes in 3D and 2D,3D and Ti,and Ti and 2D models were enriched on the multicellular organismal development term and cell differentiation term (P<0.05);also on MAPK signaling pathway,cell adhesion molecules (CAMs),and regulation of actin cytoskeleton (P<0.05). Conclusion:There are differences in genome-wide DNA methylation status of MDA-MB-231 cells cultured in 2D, 3D cell culture and Ti models.

Objective: To study the value of speckle tracking echocardiography (STE) for assessing left ventricular remodeling (LVR) in patients of acute ST-elevation myocardial infarction (STEMI) with late percutaneous coronary intervention (PCI). Methods: A total of 127 STEMI patients with elective PCI were enrolled. Echocardiography was conducted within 48 hours of admission and the patients were followed-up for 6-9 (median 7.8) months after discharge. LVR was deifned by left ventricular end-systolic volume (LVESV) elevation >15% than the ifrst echocardiography. The patients were divided into 2 groups: LVR group,n=41 and Non-LVR group,n=84. Results: There were significant differences between 2 groups in left ventricular global longitudinal strain (GLS), longitudinal Ts-SD, radial strain (RS) and longitudinal postsystolic index. Further Logistic regression analysis indicated that GLS (OR=0.39, 95% CI 0.26-0.57,P<0.01) and RS (OR=1.07, 95% CI 1.02-1.13,P=0.01) were the independent predictors for LVR occurrence; ROC presented that the optimal cut-off value for GLS was -10.85% (sensitivity 89.7%, specificity 91.7%) and for RS was 28.46% (sensitivity 82.1%, speciifcity 66.7%). Conclusion: STE measured GLS and RS were the independent predictors for LVR occurrence in STEMI patients with late PCI.

The aging of population and the increasingly morbidity rate of chronic disease had brought great influence on public health and economy.And community whose scientific management model could improve effectivity was a main prevention place for chronic disease.Thus on the basis of domestic and foreign literatures,several types of chronic disease community management models were introduced,and aimed at providing a reference for community chronic disease management.

Objective To explore the relation between rheumatoid arthritis (RA) and the meteorological factors.Methods All RA cases in the group were followed for 12 months,patients were follow-up for every two weeks.In each followed-up,all RA cases were evaluated by the disease activity score-28 (DAS28) and the improved Jamieson questionnaire,and the correlation of the DAS28 and the average values of meteorolo-gical factors (temperature,humidity,atmospheric pressure,relative humidity,wind speed) by Pearson correlation coefficient.The moderate-severe activity cases were evaluated by chi-square test of different seasons.Results One hundred and eighty-eight cases completed the observation,One hundred and sixty-four cases were in moderate disease activities (x2=9.42,P=0.022).Sixty-eight cases were distributed in winter,which was significantly higher than other three seasons.The average temperature and wind speed was negatively related to the DAS28 (r=-0.743,P＜0.01; r=-0.576,P=0.003).Conclusion The activity of RA has the characteristics of seasonal changes,and is easily being aggravated in winter.Many factors may influence RA,including temperature and wind speed.Creating an appropriate micro-climate environment is beneficial for RA patients to reduce the disease activity.

Objective: To evaluate left atrial (LA) function and synchrony in lone atrial fibrillation (LAF) patients by two-dimensional speckle tracking echocardiography (2D-STE) and to explore the predictive value of 2D-STE parameters for AF recurrence after ablation procedure. Methods: Our research included in 2 groups: LAF group,n=50 patients diagnosed in our hospital from 2013-06 to 2015-05; it was further divided into 2 subgroups as Non-LA enlargement subgroup,n=34 and LA enlargement subgroup,n=16 and Control group,n=35 healthy subjects. With sinus rhythm, 2D-STE was conducted to obtain LA peak ventricular systolic longitudinal strain (PALS), strain rate (SRs) and atrial contraction longitudinal strain (ACLS), strain rate (SRa). Standard deviation for the time to peak (TPSD) of regional strain was calculated. TPSD during ventricular systole was named as SDs and TPSD during ventriculardiastole was named asSDa. Results: Compared with Control group, LAF group had reduced PALS (28.34±8.57) vs (38.73±6.13), SRs (1.17±0.31) vs (1.57±0.25), ACLS (14.11±4.91) vs (18.86±3.57 ) and SRa (-1.41±0.58) vs (-1.90±0.30), allP<0.05; while elevated SDs (8.11±3.00) % vs (4.67±1.48) % and SDa (5.57±2.26) % vs (3.11±1.13) %, bothP<0.05. Furthermore, Compared with Control group, Non-LA enlargement subgroup had decreased PALS, SRs, ACLS and SRa, allP<0.05; while increased SDs and SDa, bothP<0.05. Logistic regression analysis indicated that compared with traditional parameters, SDs and SDa could more effectively distinguish LAF patients from normal subjects (SDs with the sensitivity 83%, speciifcity 72% and SDa with the sensitivity 81%, speciifcity 76%). Elevated SDa and SDs were the best predictors for post-operative AF recurrence (SDs with the sensitivity 80%, speciifcity 71% and SDa with the sensitivity 86%, speciifcity 79%). Conclusion: 2D-STE may detect LA dysfunction and dyssynchrony in LAF patients, abnormal parameters could be found in LAF patients without LA enlargement. SDs and SDa were the best predictors for post-operative AF recurrence.