Objective:To compare the shear bonding strength between two kinds of veneering ceramics respectively bonded to Vita Mark II.Methods:Vita Mark II samples were prepaired in the size of 8 mm ×6 mm ×2 mm.Veneering ceramic VM9 and Titankeram-ik were sintered on the Vita Mark II blocks respectively(n =1 0).The shear bond strength of each specimen was measured,the failure mode of the fracture surface was observed by SEM.The element in the bonding interface was analysed by field emission scanning elec-tron microscope(FE-SEM).Results:The values of shear bond strength (MPa)of VM9 and Titankeramik groups were 36.1 7 ±8.91 and 42.07 ±8.31 respectively(P >0.05).SEM observation showed tight bond between the two materials,FE-SEM results showed penetration of Al element from MarkⅡblock into veneering porcelain VM9 or Titankeramik.Conclusion:Veneered porcelain of VM9 and Titankeramik can be used as the individual veneering ceramics for Vita Mark II blocs.

Objective To analyse the color ranges of 3 kinds of imported composite resin and to compare the color range of imported composite resin with that of Chinese teeth in the southwest of China. Methods The color of 3 kinds of imported composite resin was mearsured with the spectrophotonery system of human tooth color which had a fiber optic heading.The color range of imported composite resin was compared with that of Chinese teeth. Results The color distribution spaces of 3 kinds of imported compositeresin had different color ranges that were smaller than that of Chinese teeth. Being compared with Chinese teeth color, imported composite resin was short of higher and lower light color, and imported composite resin was short of greener and redder color either. Conclusions The color distribution spaces of imported composite resin are different from that of Chinese teeth in the southwest of China, and any kind of composite resin can not meet the color demand from dental clinic.

Objective To explore the clinical and laboratory characteristics of patients with dengue fever(DF)in Guangzhou from July to September in 2006 and to improve the awareness of dengue virus infection for physicians.Methods Clinical data of 277 patients with DF admitted to our hospital in Guangzhou were retrospectively analyzed.Dengue virus was isolated from patients' blood specimens by C6/36 cell culture and typed by reverse transcriptase-polymerase chain reaction(RT-PCR)assay and gene sequencing.Results Age of the 277 patients,148 males and 129 females,averaged 36 years with a standard deviation of 17 years,ranging from 9 months to 78 years.Their most common symptoms included fever(100.0%),skin rash(85.2%),headache(69.3%),myalgia(51.3%),bone soreness (39.0%)and nausea or vomiting(39.4%),and leucopenia and/hromboeytopenia occurred in 75.5% and 62.5% of them,respectively.Elevated alanine aminotransferase(ALT)was found in 59.6%,elevated aspartate aminotransferase(AST)in 81.6%,and hypopotassemia in 53.8% of them.Serum positivity of antibody against dengue virus IgM was 90.6%,which could be detected 3 to 10 days after onset of the illness,with a mean of 6.2 days with a standard deviation of 1.9 days.Cell-cultured virus from 20 patients were identified as typed by RT-PCR and RNA sequence analyses.All patients were clinically classified as typical DF and all of them completely recovered.Conclusions DF during this epidemic in Guangzhou was caused by dengue virus-1,with typical manifestations in all the patients but more damage in the liver.Some patients demonstrated hypopotassemia,but no dengue hemorrhagic fever or dengue shock syndrome was found.All the patients experienced a good prognosis with timely diagnosis and treatment.

The article discusses how to innovate in the departmental rotation examination for the students practicing in hospital in the new time.It is important for the teacher to provide guidance to students and motivate them to take part in comprehensive training of competence actively so as to cultivate the high-level medical students adaptive to the modern society.

Humanistic spirit advocates the concern for human,and the medical value of people foremost.Now status quo of oral medical students' humanities concern is worrying.This paper aims to analyze the reason,and the best way to culture oral medical students' humanities concern is not only to have an aim of training medical professionals who have oral medical knowledge and skills,but also to look upon the education of medical humanistic spirit as important educative content,to improve teachers' humanities diathesis,to enhance the contact between medical students' and society or patients,to foster affection,to train skills,and to establish the good environment of humanities education.

Objective To investigate the preventive effects of epigallocatechin gallate (EGCG) on growth and metastases of orthotropic colonic cancer. Methods Forty BALB/C male nude mice were prepared for model of colonic cancer and then divided into control group and low-, medium- and high-dose of EGCG groups with 10 each. Except control group, the mice in other three groups were treated with 5, 10 and 20 mg·kg~(-1)·d~(-1) of EGCG. The effect of EGCG on growth and metastases of colonic cancer was observed. The histopathologic changes of liver and lung were observed with HE, and protein expression of NF-E2-related factor 2 (Nrf2) in cancerous tissue was detected by immunohistochemistry. RT-PCR was used to examine mRNA levels of Nrf2, UDP-glucuronosyhrans-ferase (UGT)1A, UGT1A8 and UGT1A10. Results In comparison with control group [(564±130) mg], the average weight of the tumor in low-, medium- and high-dose groups was (152±63) mg, (76±42) mg and (18±10)mg, respectively, with tumor inhibitory rate of 73.0%, 86.5% and 96.8%, respectively (all P value<0.05). There was a positive correlation between tumor inhibitory effect and dosage of EGCG (P<0.05). The protein expression of Nrf2 and the mRNA levels of Nrf2, UGT1A, UGTIA8 and UGTIA10 in three EGCG treated groups were increased significantly compared with control group (P<0.05), and there was a phenomenon of nuclear transcription of Nrf2. Conclusions EGCG can prevent local growth and metastases of orthotopic colonic cancer in a dose-dependent manner in nude mice. The inhibitory effect may be caused by inducing the expressions of Nrf2, UGT1A, UGT1A8 and UGT1A10 genes.

Objective To investigate the effect of methimazole on male patients with hyperthyroidism and hyperplasia of mammary glands and its effect on sex hormone levels.Methods A total of 97 cases of hyper-thyroidism treated in the hospital from February 2014 to February 2017 were selected as the research subjects. These patients were divided into group A (patients with hyperthyroidism with mammary gland development , 33 cases) and group B (patients with hyperthyroidism ,64 cases) according to whether patients had the combi-nation of hyperplasia of mammary glands.Two groups of patients were treated with methimazole ,thyroid hor-mone levels and sex hormone levels before and after treatment were compared between the two groups.Results Before treatment ,there was no significant difference in the levels of free T 3 (FT3) ,free T4 (FT4) ,three io-dine thyroxine (T3) ,thyroxine (T4) ,and thyroid stimulating hormone (TSH) in the two groups (P＞0.05). After treatment ,the levels of FT3 ,FT4 ,T3 and T4 in both groups were significantly lower than those before treatment ,while the level of TSH was significantly higher than that before the treatment (P＜0.05).There was no significant difference in the levels of FT 3 ,FT4 ,T3 ,T4 and TSH between the two groups (P＞0.05). Before treatment ,the levels of total testosterone (T) ,luteinizing hormone (LH) ,prolactin (PRL) and estradi-ol (E2) in group A were significantly higher than those in the B group (P＜0.05).After treatment ,the levels of T ,LH ,PRL and E2 in group A were significantly lower than those before treatment (P＜0.05).After treat-ment ,the levels of T ,LH ,FSH ,PRL ,E2 ,P in the two groups were not statistically significant (P＞0.05). Conclusion Patients with hyperthyroidism combined with hyperplasia of mammary glands has a high level of sex hormones.After hyperthyroidism treatment ,thyroid hormone and sex hormone levels can be significantly changed into a better status.

Objective To summarize the preliminary experience of endovascular stent-graft exclusion for aortic dissections. Methods From October 2003 to February 2007,121 patients[86 males,37 females,mean age(53.7?13.8)years,range 29～ 72 years]underwent endovascular stent-graft exclusion for aortic dissections,including Stanford B in 114 patients,Stanford A in 4, and traumatic aortic mptore in 3.An emergency operation was performed in 4 patients for acute aortic rapture.Results No primary conversion was needed.There was no postoperative death,no spinal cord iscbemic injury,or stent displacement or subclavian steal syndrome.Postoperative hospital stay time was(4.0?1.3)days.Complications included fever in 35 patients,type Ⅳ endoleak in 11,type Ⅰ endoleak in 1 and acute renal dysfunction in 1.Contusion Endovascular thoracic aorta repair is an effective,less inva- sire and safe surgery for patients with Stanford B or some Stanford A aortic dissection and traumatic aortic rupture.

Objective To assess the diagnostic value of confoeal laser endomicroscopy(CLE) in histological gastritis.Methods A total of 149 patients underwent CLE.Standard locations and focal lesions were examined by confocal imaging, and specimens were taken by targeted biopsy.The relationship between confocal images and histological findings were studied systemically.Results The sensitivity,specificity and accuracy of CLE in diagnosis of atrophy were 83.6%,99.6%and 97.5%,respectively;and those in moderate to severe neutrophil infiltration were 81.9%,99.3%,and 95.8%,respectively.The mean kappa values for inter-and intra-observer agreement on the classification of confocal images in groups were 0.749 and 0.811 respectively.Conclusion The validity and reproducibility of CLE in diagnosis of histologic gastritis are promising,which might warrant its further application in clinical practice.

OBJECTIVE:To investigate the effects of UGT1A6 and UGT1A9 gene polymorphisms on blood concentration of valproic acid in Han epileptic patients.METHODS:Totally 107 Chinese Han epileptic patients were selected from outpatient department of our hospital during Jan.2014-Apr.2015.They were given valproic acid monotherapy treatment for 3 months to 6 years.The steady state concentration ofvalproic acid was detected by EMIT.UGT1A6 (rs2070959,rs6759892) and UGT1A9 (rs13418420,rs2741045,rs2741049,rs6731242,rs72551330) genotypes were detected by MALDI-TOF-MS.The correlation of gene polymorphism with con centration dose ratios (CDR) of valproic acid was investigated.RESULTS:UGT1A9 rs72551330 mutation had not been detected,and the frequency of genotypes in other 6 sites were all in line with Hardy-Weinberg balance (P＞0.05).The CDR of valproic acid in pa tients with UGT1A6 rs2070959,rs6759892 mutation (AG+GG or TG+GG type) were significantly lower than those with wild homozy gote (AA or TT type),with statistical significance (P＜ 0.05).There was no statistical significance in CDR of valproic acid among patients with UGT1A9 rs13418420,rs2741045,rs2741049 and rs6731242 wild homozygote and mutation (P＞0.05).CONCLUSIONS:UGT1A6 rs2070959,rs6759892 gene polymorphisms of Han epileptic patients are associated with blood concentration of valproic acid,and the patients with UGT1A6 rs2070959,rs6759892 mutation need more dose ofvalproic acid.