BACKGROUND: Composite resin functions as a practical resin restoration material with beautiful outlook, modifying its mechanical properties has become a hot spot in research.OBJECTIVE: To prepare resin specimens with two kinds of inlay curing machines: CERAMAGE and TESCERA, and to compare the mechanical properties of these specimens.METHODS: The resin specimens supporting two machines were cross-matched with these machines and then divided into four groups: Group A was Tescrea resin prepared with TESCERA machine; group B was Tescrea resin prepared with CERAMAGE machine; group C was Ceramage resin prepared with CERAMAGE machine; group D was Ceramage resin prepared with TESCERA machine. The standard specimens were determined for compressive strength, hardness and flexural strength.RESULTS AND CONCLUSION: The compressive strength and hardness in group A were higher than those in other three groups,and group B exhibited higher compressive strength and hardness than groups C and D (P < 0.05). The flexural strength in groups C and D was higher than that in groups A and B (P < 0.05), there was no significant difference between groups C and D, neither betweens group A and B. The experimental findings indicate that TESCERA inlay machine and Tescera resin achieve the optimal mechanical properties.

Objective To study the effects of Bitong mixture on children with chronic sinusitis and nasal polyp in perioperative period.Methods 72 patients acquired for nasal endoscope were randomly divided into a combining traditional Chinese and western medicine treatment group and a control group.The control group was given traditional western medical treatment,and treatment group was given Bitong mixture on that basis.Results ①clinical effects:Total effective rate of postoperative 3 months、6 months、9 months was 94.59％、88.89％、80.00％ in the treatment group respectively and 88.57％、80.00％、66.67％ in the control group respectively.Compared the two groups after treatment at the same time,differences were statistically significant (x2=6.41 、6.81、7.22,P＜0.05).The efficacy of 12 months after operation in the treatment group and control group declined compared with that of 3 months after operation in each group,but still significant differences existed between groups (x2=6.08、6.98,P＜0.05).②symptom score:symptoms improvements such as alleviating headaches 、reducing pus stuff at 2 weeks 、1 months 、3 months after treatment in the treatment group was obvious than those before the treatment (P＜0.01),and also better than those in the control group at the same time.The improving blocked nose,sense of smell after three months treatment in the treatment group were better than those of the control group respectively at the time(P＜0.05).Conclusion Traditional Chinese medicine can effectively improve symptoms,enhance the curative effect in children with chronic sinusitis and nasal polyp at perioperative period,and it is worth of further clinical application and research.

Objective To study the effects of supra-physiologic glucose on the expression of PDX-1 and insulin secretion. Methods Islet cells isolated from SD rats were incubated in medium containing 5.6 mmol/L or 33 mmol/L glucose respectively for 3 days. Basic and glucose-induced insulin levels in supernate and in islet cells were detected. The PDX-1 mRNA and protein were detected. Results (1) Islet cells exposed to 33 mmol/L vs 5.6 mmol/L glucose for 3 days showed significant decrease in the basic and glucose-induced insulin release, and in cell insulin content and PDX-1 protein. (2) Prolonging incubation of islet cells in 33 mmol/L glucose aggravated the inhibitive effect on PDX-1 expression and insulin secretion. (3)Recovery to normal concentration of glucose in 3 days could partly improve PDX-1 expression and insulin secretion. Conclusions Inhibition of PDX-1 is one of the mechanism of glucotoxicity, and recovery to normal concentration of glucose in 3 days can partly improve PDX-1 expression and insulin secretion.

Objective:To investigate a method to identify Actinobacillus actinomycetemcomitans serotypes by polymerase chain reaction. Methods:18 Actinobacillus actinomycetemcomitans strains representing serotypes a to f were used in the test. 6 pairs of specific oligonucleotide primers for gene clusters involved in the biosynthesis of serotype specific polysaccharide antigens were designed. The primers were developed and evaluated in a genetic method of identifying serotypes of Actinobacillus actinomycetemcomitans strains by using a PCR assay. Results: Each pair of primers can specifically identify one serotype of Actinobacillus actinomycetemcomitans strains. No cross reaction was observed in all 18 strains. The PCR product sizes were as follows: 428 bp (serotype a), 298 bp (serotype b), 559 bp (serotype c), 690 bp (serotype d), 211 bp (serotype e) and 232 bp (serotype f). Conclusion:PCR method may be useful to identify Actinobacillus actinomycetemcomitans serotypes rapidly and directly.

Objective To study glucose metabolism in patients with liver cirrhosis and to explore the relationship between glucose and liver function.Methods 164 liver cirrhosis patients with abnormal glucose metabolism were divided into A,B and C groups according to Child-Turcotte-Pugh(CTP)classification system.Glucose metabolic disorder and relation between blood sugar level and liver function were observed and analyzed.Results We divided the patients into three subgroups according to their blood sugar levels:hypoglycemia group,impaired fasting glucose group and diabetes mellitus group.Patients of Grade C were with the highest incidence of hypoglycemia,with a P value P

In this experiment, primary mixed culture cells of lung and liver derived from new born mouse was made use of target cells, 0.1 ?Ci 3~H-TdR per milliliter medium was added in the culture in order to induce malignant transformation of the cells in the culture. Results of the experiment was that the cells effected by 3~H-TdR had a unlimited growing and formed sarcoma after being inoculated into new born mice immunosuppressed with ATS. It suggested that they had became malignant transformation cells. Results of analysis of chromosome aberrations of the transformed cells, the long arm chromosome was observed in 5% of cells, the metacentric chromosome in 7% of cells, the acentric fregment in 8% of cells. It shows that DNA damage of the cells induced by 3~H-TdR causes their chromosome aberrations and, futhermore, development of malignant cells. The fact that unstable aberrations was Still in sight in the malignant transformation cells suggested that there have been a bit of 3~HTdR left in these cells which kept damaging DNA of the cells.

Objective To induce adult adult adipose-derived stem cells(ADSCs) in vitro to differentiate into neuronal-like cells,and to analyze the features of their cell morphology and ultrastructure. Methods Adipose stromal cells were obtained and amplified in vitro. Then make use of chemical induction to induce them. Observed ADSC and differentiation of cells in morphology and ultrastructure under inverted microscope and transmission electron microscopy. Immunocytochemistry to detection of Nestin, Neuron Specific Endolase( NSE) ,and glial fibrillary acidic protein(GFAP) expression in cells. Used Real-time PCR to detection of Nestin,GFAP gene mRNA expression before and after induction in ADSC. To observe the morphology and ultrastructure of the cells prior to and after induction under microscope and electron microscope. Results The morphology of ADSC was similar to fibroblasts ,and could be amplified stability within 10 passages in vitro. Some of the cells induced display a typical astrocyte-like cells in ultrastructure. Followed neuronal induction,astrocyte-like cells began to stain brightly for CFAP, Nestin. GFAP stained in both the cytoplasm and nuclei of astrocyte-like cells, but Nestin only stained in the cytoplasm. The peak positive expression rate within 14d following neuronal induction. The rate of positive expression cells was( 14.4 ± 3. 6) % for Nestin, (87. 3 ± 5. 3 ) % for GFAP. Then two kinds of protein expression remained the similar rate. The average relative concentration of GFAP and Nestin gene mRNA have significant statistical difference between ADSC and differented cells analyzed by Real-time PCR (P<0.05).The peak concentration of GFAP was within 20 d after induction,and GFAP was within 14 d after induction. Conclusion In the cytoplasm of adult adipose-derived cells possess Nestin genetic material,which is the marker of neural stem cell. The differential astrocyte-like cells have the typical morphology, ultrastructure and GFAP phenotype of mature astrocytes.

Objective To investigate the relationship between carotid intima-media thickness (IMT) and coronary atherosclerosis plaque through coronary CT angiography (CTA) in asymptomatic individuals.Methods Two hundred and fifty cases with CTA screened were selected in asymptomatic individuals,and according to the inspection result they were divided into no plaque group (detection of no coronary atherosclerosis plaque,180 cases) and plaque group (detection of coronary atherosclerosis plaque,70 cases).All cases were checked carotid IMT with B-ultrasonic.Results ANOVAs analysis showed that age and body mass index (BMI) had significant correlation with coronary atherosclerosis plaque (P ＜ 0.05).x2 test was used to show the smoking and family history of coronary heart disease had significant correlation with coronary atherosclerosis plaque (P ＜ 0.05).Univariate Logistic regression analysis showed that carotid IMT,systolic pressure,diastolic pressure,low density lipoprotein cholesterol,fasting serum glucose and creatinine had significant correlation with coronary atherosclerosis plaque (P ＜ 0.05).Multifactor Logistic regression analysis showed that carotid IMT had correlation with coronary atherosclerosis plaque (P ＜ 0.05).Conclusion There is significant relationship between carotid IMT and coronary atherosclerosis plaque in asymptomatic individuals.

OBJECTIVE: To review the development and mechanism of platelet-rich plasma (PRP) and the unsolved problems so as to provide reference for the clinical application of PRP.DATA SOURCES: Articles on effects of platelet-rich plasma on bone repair are searched from Medline between January 1995 and June 2005 on computer. The key words were platelet rich plasma, bone, and repair.Meanwhile, the same search was conducted to determine the correlated articles during January 1998 to June 2005 from Wanfang database with key words of platelet-rich plasma, bone and repair in Chinese.STUDY SELECTION: Literatures at home and abroad on the PRP and bone repair were chosen; Non-randomized controlled literatures were included.DATA EXTRACTION: Totally 40 out of 49 reports related to PRP and bone repair met the criteria. 9 reports were excluded due to the repeated same research. The rest 40 reports were sorted out and conducted literature review.DATA SYNTHESIS: Platelet-rich plasma was originally used in clinic to repair mandibular defect in 1998, by adding PRP to grafts with a radiographic maturation rate 1.62 to 2.16 times that of grafts without PRP. Up to now, PRP has been used in many medical areas to accelerate tissue healing due to its advantages of safety, simple, low-cost. But some problems still remain to be studied and solved.CONCLUSION: PRP includes many sorts of growth factors and has been proved to be beneficial to the maturation of both bone tissue and soft tissues. PRP is autologous and can be produced easily and safely from autologous blood, without the concerns of transmissions and immunological rejection of various diseases.

Objective To reseach the time point of the highest percentage of neural precursor cells derived from adipose stromal cells (ADSCs) in vitro, and to observe the ultrastructure features of neural precursor cells. Methods Used the β-mercaptoethanol to induce ADSCs to differentiate into neural precursor cells and neuron-like cells. The morphology of the uninductedcells and inducted cells were observed with inverted phase contrast microscope. The expression of nestin which was the marker of neural precursor cell in each group was detected using immunofluorescence staining method. The ultrastructural feature of cells which was induced for 3 hours were observed. Results The highest ratio of positive expression of nestin was 3 hours following induction,with the ratio ( 86.25 ± 4.82) %. There were many protuberance on the cell membrane under transmission electron microscopy.There were plenty of organelles in the neural precursor cells. The neural precursor cells had a large size nucleus,large nucleoplasmic index, much extended chromatin,and less condensed chromatin. The nucleus had double-layer nuclear envelope, more nuclear pore on the nuclear envelope. Conclusion The time point of the highest percentage of neural precursor cells derived from ADSCs is 3 hours,and the ultrastructral feature of induced neural precursor cells confirm that cells at this time point are in a state of split active period.