BACKGROUND: The vibration of high speed handpiece during tooth preparation may have adverse effect on the continuous force of the bonding interfaces among the cement, dentin, and post core. OBJECTIVE: To find the effect of different types of cements on the coronal microleakage of fiber post under different tooth preparation timings, and to provide evidence for the clinical operation. METHODS: The extracted mandibular premolars were divided into 3 groups, and they were cemented by Rely X luting, Panavia F and Paracora 5 mL, respectively. Each group was averagely divided into 3 subgroups: A, B, C groups which were prepared 15 minutes, 45 minutes, and 90 minutes after the cements mixed. All roots were then dyed and transparented. The teeth were observed under stereoscopic microscope and the dyeing scores were also recorded. RESULTS AND CONCLUSION: Rely X luting caused the highest coronal microleakage of fiber post, followed by Panavia F, while Paracore 5 mL, brought about the lowest under the same tooth preparation timing. Different tooth preparation timing caused no significant effect on the coronal microleakage of fiber post when the cement had been completely set.

OBJECTIVETo prepare sodium alginate-nanohydroxyapatite composite material and to explore its feasibility as a bone repair material.

METHODSSodium alginate-nanohydroxyapatite composite material was prepared using chemical cross-linking and freeze-drying technology. The composite was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) and its porosity was measured by liquid displacement method. The fifth passage of bone marrow stromal stem cells (BMSCs) were incubated on the composite material and then growth was observed by inverted microscope and SEM. BMSCs were cultured with liquid extracts of the material, methyl thiazolyl tetrazolium (MTT) assay was used to calculate the relative growth rate (RGR) on 1, 3, 5 d and to evaluate the cytotoxicity. Fresh dog blood was added into the liquid extracts to conduct hemolysis test, the spectrophotometer was used to determine the optical density (OD) and to calculate the hemolysis rate.

RESULTSSodium alginate-nanohydroxyapatite composite material displayed porosity, the porous pore rate was (88.6 +/- 4.5)%. BMSCs showed full stretching and vigorous growth under inverted microscope and SEM. BMSCs cultured with liquid extracts of the material had good activities. The toxicity of composite material was graded as 1. Hemolysis test results showed that the hemolysis rate of the composite material was 1.28%, thus meeting the requirement of medical biomaterials.

CONCLUSIONThe composite material fabricated in this study has high porosity and good biocompatibility.

Alginates ; Biocompatible Materials ; Cells, Cultured ; Glucuronic Acid ; Hexuronic Acids ; Humans ; Mesenchymal Stromal Cells ; Porosity ; Tissue Engineering ; Tissue Scaffolds

Objective To investigate the effect and mechanism of Yiqi Shuxin pills in the treatment with viral myocarditis(VMC).Methods 56 cases of VMC in our hospital were randomly divided into the experimental group and the control group,28 cases in each group.The patients in the control group were with routine treatment,and these in the experimental group were treated with Yiqi Shuxin pills based on the control group.The clinical effects between the two groups were compared, and the changes of miR, myocardial enzyme spectrum and immunity were compared before and after treatment.Results The total effective rate was 92.86% in the experimental group and was 72.57% in the control group,there was statistical significance between the two groups(P<0.05);There was no significant difference between the two groups before treatment at miR-1,miR-133,miR-21,CK-MB, cTnI,LDH,CD3 +,CD4 +,CD8 +,NK in serum;The content of miR-1,miR-133,CD3 +,CD4 +,CD8 +,NK after treatment in the two groups were higher than before treatment(P <0.05),miR-21,CK-MB,cTnI and LDH were lower than before(P <0.05);The improvement of these indicators in the experimental group was superior to that in the control group(P<0.05).Conclusion Yiqi Shuxin pills could improve the therapeutic effect of VMC,the mechanism maybe related to improving the circulation of blood miR and enhance cellular immune function.

Objective To investigate clinical effect and mechanism of Yudanrongxin pills in the treatment of patients with acute myocardial infarction ( AMI) .Methods 86 cases of AMI in our hospital from February 2014 to February 2015 were selected and divided into the observation group and the control group, with 43 cases in each group.The patients in the control group were treated with conventional therapy, while patients in observation group were treated with Yudanrongxin pills on the basis of the control group.The related inflammation factors, indicators of myocardial injury and heart function index were compared between two groups before and after treatment.Results Compared with before treatment, in both two groups after treatment, the serum inflammatory factors including high-sensitivity C-reactive protein(hs-CRP), IL-6,soluble vascular cellular adhesion molecule-1 (sVCAM-1), TNF-αand P-selectin decreased, the myocardial injury criterion including creatine kinase-MB (CK-MB), lactate dehydrogenase (LD), myocardial troponin I (cTnI) and myoglobin (Mb) decreased,the cardiac function indexes of left ventricular end systolic volume (LVESV) and left ventricular end diastolic volume (LVEDV) decreased and left ventricular ejection fraction (LVEF) increased (P<0.05).Compared with control group, the hs-CRP,IL-6,sVCAM-1,TNF-α,P-selectin,CK-MB,LD,cTnI and Mb in observation group were lower(P<0.05).The degree of improvement at cardiac function was better than that in control group (P<0.05).Conclusion Yudanrongxin pills could better improve cardiac function in treatment with AMI, its role was relative to inhibition of inflammatory factors and myocardial protection against injury.

Objective To analyze the clinical feature and pathological characteristics of oral submucous fibrosis (OSF) coexisted with oral leukoplakia (OLK) or oral lichen planus (OLP),and summarize both the common and each clinical and pathological characteristics of two kinds of diseases.Methods The clinical and pathological data of 74 patients with OSF coexisted with OLK and 57patients with OSF coexisted with OLP were retrospectively reviewed.Results Most of patients with OSF coexisted with OLK or OLP were mainly young and middle-aged male patients,and all had the habit of eating betel quid chewing.Most of them had the habit of smoking and alcohol drinking; while their limitation of mouth opening were not obvious.Patients coexisted with unilateral OLK or OLP all had a unilateral mastication of chewing betel nut;the prevalence rate of erosive OLP was lower in the patients with OSF coexisted OLP than that of OLP patients never chew betel nut.The pathology of both OSF coexisted with OLK or OLP was with the respective characteristics of OLK or OLP on the basis of OSF,and the epithelium was thickened more than atrophic.No relationship was found between the degree of epithelial hyperplasia and the severity of fibrosis in patients with OSF coexisted with OLK.Conclusions OSF coexisted with OLK and OSF coexisted with OLP were the occurrence of OLK or OLP on the basis of OSF,which were not a simple superposition of two diseases,but combination with their own characteristics of OSF coexisted with OLK or OLP.

Objective To obtain genes encoding the novel molecules for diagnosis of schistosomiasis.Methods Juvenile S.japonicum cDNA library was immunoscreened to obtain positive clones.By DNA sequencing and sequence analysis,the target gene was amplified by PCR and subcloned into prokaryotic plasmid pET28a.The recombinant plasmid was transformed into E.coli BL21 followed by expression of the protein induced by IPTG.The protein was identified by Western blotting.Results 34 positive clones were obtained,24 of which were chosen to be sequenced,13 of which were Sj22600 gene.The protein were recognized with sera of infected rabbits and patients with acute and chronic schistosomiasis by Western blotting.Conclusion The gene coding for Sj22600 membrane protein was screened with high frequency in the cDNA library.The E.coli BL21 transformed with the recombinant plasmid can express the fusion protein,which shows immunoactivity.

Objective To obtain novel vaccine candidate antigens against Schistosoma japonicum. Methods S. japonicum schistosomula cDNA library was screened by using sera of Microtus fortis that was naturally resistant to schistosomiasis. The positive clones were transformated into Escherichia coli BM25.8, E. coli clones containing the plasmid cultured in LB, and then selected for plasmid extraction, the plasmid DNA was digested by EcoRⅠand Hind Ⅲ, and analysed by agarose gel electrophoresis. The positive clones were also sequenced and the data were analysed through the internet Nucleotide BLAST software of NCBI and Expert Protein Analysis system of GeneRunner and HNN. Results Twelve positive clones were obtained after repeatedly immunoscreening the library and their sizes ranged from 300 bp to 1100 bp. Two novel genes (named as Sj-sMf1 and Sj-sMf2) with complete ORF were obtained. The deduced protein of Sj-sMf1 consisted of 93 amino acids while Sj-sMf2 consisted of 61 amino acids. Sj-sMf1 protein predicted containing one cAMP phosphorylation site and Casein kinase C phosphorylation site, respectively. Sj-sMf1 protein predicted containing one Casein kinase C phosphorylation site and two Protein kinase C phosphorylation sites. Conclusion Two novel genes predictably encoding unknown proteins are obtained from immunoscreening of Schistosoma japonicum schistosomula cDNA library by M. fortis sera.

In order to solve the problems in traditional health management experimental teaching, such as high cost, safety and difficult repeatability, a virtual simulation experimental teaching platform for health management combined with Traditional Chinese Medicine (TCM) characteristics has been constructed by using virtual simulation, multimedia, and human-computer interaction technologies, which comprises TCM constitution identification, TCM health management and health management service process. Through the combination of virtual simulation and reality situation, the platform has formed an online and offline model of experimental teaching, which has improved the innovation and practice ability of students and enhanced the teaching quality.

Objective : To observe the dynamic expression of recombinant lysyl oxidase like protein 1 ( LOXL1) in the lysine oxidase family in the liver of C57BL/6 mice infected with Schistosomajaponicum and explore its role in hepatic fibrosis． Methods: Mice were infected subcutaneously with cercariae of S．japonicum，and sacrificed with euthanasia in 6，9 and 12 weeks after infection．The sera and liver tissues were collected．The levels of liver fibrosis in mice was dynamically evaluated by HE and Sirius red staining，and the serum transaminases were detected．The dynamic expression levels of collagen type Ⅰ ( Col1) ，LOXL1 and α-smooth muscle actin( α-SMA) in liver tissues were determined respectively by Western blot and qPCR. Finally，the dynamic levels of soluble and insoluble collagens were detected. Results: The result of HE and Sirius red staining showed that hepatic fibrosis levels increased at 6 weeks，peaked at 9 week，and decreased at 12 week in response to S．japonicum infection．Western blot and q-PCR showed that the expression levels of LOXL1，Col1 α1，Col3 α1 and α-SMA was significantly up regulated and reached maximum at the 9th week in response to S．japonicum infection．Soluble collagen protein levels reached maximum at the 9th week．and decreased at 12 week，however insoluble collagen protein levels continued to increase． Conclusion There may be a correlation between LOXL1 and fiber cross-linking in the process of hepatic fibrosis in S．japonicum，and it plays a role in promoting hepatic fibrosis.