Objective:To investigate the risk factors of musculoskeletal disorders(MSDs)in dental postgraduates.Methods:271 dental postgraduates majoring in five different specialties(orthodontics,prosthodontics,endodontics,periodontics and alveolar surgery) with average (2.78 ±1 .57)years of clinical practice were recruited.254 age-matched non-dental postgraduates were served as the controls.The standardized Nordic questionnaire on MSDs and a self-report questionnaire regarding correlative factors were answered. Reliability of the responses was assessed by applying test-retest method.Results:The test-retest method revealed a high reliability of participants'answers with the intraclass correlation coefficient ranging from 0.89 to 0.96.Dental postgraduates had significantly higher incidence (85.6%)of MSDs than the controls(70.4%).In all included dental specialties,high prevalence of MSDs was reported at neck (47.5%-69.8%),followed by shoulders (50.8%-65.1 %),lowerback (27.1 %-51 .2%)and upper back (25.6%-46.5%).Meanwhile,the high prevalence of MSD varied in different specialties.Year of clinical work,clinical hours per week and desk hours per week were found to be the risk factors for MSDs,whereas physical exercise and rest were protective factors.Conclu-sion:MSDs with high prevelence and distinct specialty-related characteristics initiate at the early stage of dental career.Relevant measures to prevent and protect against MSDs should be taken during school-days.

[Abstract ] Objective The pathogenesis underlying cognitive dysfunction has yet to be fully elucidated.The article was to investigate the effects of memantine on lipopolysaccharide (LPS)-induced spatial learning and memory impairment in C57BL/6J mice. Methods 36 male C57BL/6J mice were randomly divided into 3 groups:control group (C group), lipopolysaccharide group (L group) and memantine group (M group) (n=12).Mice in C, L and M groups were intraperitoneally injected with the same volume of saline, LPS and LPS plus memantine re-spectively for 7 consecutive days.On the 8th day, mice were tested in the Morris water maze, in which the latency to the platform and the propor-tion of time spent in the target quadrant were recorded .Then the mice were sacrificed and the hippocampi were harvested for the determination of expression levels of Amyloid-β(Aβ), glycogen synthase kinase-3β(GSK-3β) and mammalian target of rapamycin (mTOR). Results Com-pared with C group, L group significantly prolongated the latency to the platform (71.01 ±13.21 vs 50.56 ±9.89, P<0.05), decreased the propor-tion of time spent in the target quadrant (42.58 ±7.85 vs 63.74 ±12.43, P<0.05) and increased the levels of hippocampal Aβand GSK-3β(1.75 ±0.43 vs 1.27 ±0.23, 184.0 ±18.6 vs 100.0 ±12.1, P<0.05), (75.0 ±13.5 vs 100.0 ±10.3, P<0.05), while mTOR levels decreased significantly (97.0 ±14.3 vs 75.0 ±13.5, P<0.05).Compared with L group, M group significantly prolongated the latency to the platform (61.45 ±7.65 vs 71.01 ±13.21, P<0.05), decreased the proportion of time spent in the target quadrant shortened (58.25 ±9.02 vs 42.58 ±7.85, P<0.05) and increased the expression of hippocampal Aβ(1.35 ±0.28 vs 1.75 ±0.43,92.4 ±10.8 vs 184.0 ±18.6, P <0.05). Conclusion Memantine contributes to the improvement of LPS-induced spatial learning and memory impairment, which is probably related to the changes of the expression of GSK-3βand mTOR in hippocampus.

Objective To investigate the clinical effect of locking plate fixation in treatment of proximal humeral fractures in the elderly.Methods This retrospective case control study enrolled 96 patients with closed proximal humeral fractures admitted from October 2013 and October 2015.There were 52 males and 44 females,with age of (68.2 ± 1.4) years (range,62-74 years).According to the Neer classification of proximal humeral fractures,two-part fractures were noted in 27 patients,three-part fractures in 57,and four-part fractures in 12.According to the surgical methods,the patients were assigned to locking plate fixation (observation group) and anatomic plate fixation (control group),with 48 cases each.Operation time,intraoperative blood loss,hospitalization time,fracture healing time,varus angle of the humeral head,visual analogue score (VAS),Neer shoulder score for shoulder function and related complications were observed.Results All patients were followed up for 13-24 months (mean,18.5 months).Better results were observed in observation group than control group in aspects of operation time [(51.2 ± 14.8) minutes vs.(73.2 ±27.3)minutes],intraoperative bleeding[(158.3 ±32.9)ml vs.(270.9 ± 34.8) ml],hospitalization time [(8.2 ± 2.9) days vs.(13.1 ± 2.2) days],fracture healing time [(93.7 ±18.4)days vs.(122.9±18.9)days],varus angle of the humeral head [(2.2±1.8)° vs.(4.2± 1.3) °],VAS [(2.0 ± 0.7) points vs.(5.1 ± 1.2) points],excellence rate of Neer score (98％ vs.90％) and postoperative complication incidence (10％ vs.21％) (P ＜ 0.05).Conclusion Compared with the anatomical plate,locking plate fixation has advantages of shorter operation time,less intraoperative bleeding,earlier bone healing,better shoulder movement and less postoperative complications in treatment of proximal humeral fractures.

OBJECTIVETo establish a new visual educational system of virtual reality for clinical dentistry based on world wide web (WWW) webpage in order to provide more three-dimensional multimedia resources to dental students and an online three-dimensional consulting system for patients.

METHODSBased on computer graphics and three-dimensional webpage technologies, the software of 3Dsmax and Webmax were adopted in the system development. In the Windows environment, the architecture of whole system was established step by step, including three-dimensional model construction, three-dimensional scene setup, transplanting three-dimensional scene into webpage, reediting the virtual scene, realization of interactions within the webpage, initial test, and necessary adjustment.

RESULTSFive cases of three-dimensional interactive webpage for clinical dentistry were completed. The three-dimensional interactive webpage could be accessible through web browser on personal computer, and users could interact with the webpage through rotating, panning and zooming the virtual scene.

CONCLUSIONSIt is technically feasible to implement the visual educational system of virtual reality for clinical dentistry based on WWW webpage. Information related to clinical dentistry can be transmitted properly, visually and interactively through three-dimensional webpage.

Computer-Assisted Instruction ; methods ; Internet ; Oral Medicine ; education ; Software

Apoptosis ; drug effects ; Carcinoma, Hepatocellular ; enzymology ; pathology ; virology ; Hepacivirus ; genetics ; Humans ; Liver Neoplasms ; enzymology ; pathology ; virology ; Telomerase ; metabolism ; Viral Core Proteins ; genetics ; metabolism

OBJECTIVETo analyze several methods of wound repair for deep partial thickness burn wounds retrospectively, so as to evaluate the significance of improvement of wound microcirculation on wound healing.

METHODS(1) 2,976 burn patients admitted to our department were enrolled in the study, among them 614 undertook tangential excision, 32, eschar abrasion, 86 allo-skin coverage after debridement, 1836 tropical application of silver sulfadiazine and 408 with traditional Chinese medicine (Jing Wan Hong ointment) with gauze bandage. The results of the management with different methods were compared. (2) Rat model with deep partial thickness burn was reproduced and topical application of silver sulfadiazine was given. The rats were randomly divided into control (n = 10, with normal saline injected via caudal vein within 5 minutes postburn), and treatment (n = 10, with batroxobin injected via caudal vein within 5 minutes postburn) groups. The blood flow perfusion unit in the wound skin was measured before burn and at 0.5 to 72 postburn hours by Laser Doppler. The wound healing rate, contraction rate and wound healing time in each group were calculated on 14 and 18 postburn days (PBDs). The number of hair follicles after wound healing was observed by histological method.

RESULTS(1) The burn wound treated by tangential excision healed within 2 to 3 post operation weeks (POWs), with the healing rate of 94.8% in patients with burn covering 50% - 70% TBSA and 93.4% in those with burn of 80% approximately 98% TBSA. The healing time of patients with allo-grafts coverage after eschar abrasion was 13.8 +/- 2.1 days without scar formation. The wound healing time was 18.0 +/- 2.3 day in 82 patients with allo-graft coverage after debridement, and it was 26.0 +/- 3.2 days with subeschar healing in 1658 patients with topical application of silver sulfadiazine. Infection in burn wound was encountered in most patients undergoing traditional Chinese medicine bandage treatment with wound healing time of 26.0 +/- 2.8 days in the lower extremities. (2) The blood flow perfusion unit of the rats in the treatment group was significantly higher than that in the control group (P < 0.01). The wound healing rate in treatment group on 14 and 18 PBD was obviously higher than that in the control group (P < 0.01). But the wound contraction rate in the two groups was similar (P > 0.05). The wound healing time in treatment group was much shorter than that in control group (P < 0.01). A few hair follicles remained in the dermis of the rats in the control group on 30 PBD, and the number was evidently smaller than that in the treatment group (P < 0.01).

CONCLUSIONEarly tangential excision and eschar abrasion remained better methods in the management of deep partial thickness burn wounds, as they could ameliorate burn wound infection, shorten treatment period, raise wound healing rate and quality. Application of batroxobin could accelerate wound healing rate by improving wound microcirculation in deep partial thickness burn wound.

Adult ; Animals ; Batroxobin ; therapeutic use ; Burns ; pathology ; surgery ; therapy ; Female ; Humans ; Male ; Microcirculation ; Rats ; Rats, Wistar ; Retrospective Studies ; Skin ; blood supply ; Skin Transplantation ; methods ; Wound Healing

Natural cyclopeptides are hot spots in chemical and pharmaceutical fields because of the wide spreading bio-resources, complex molecular structures and various bioactivities. Bio-producers of cyclopeptides distribute over almost every kingdom from bacteria to plants and animals. Many cyclopeptides contain non-coded amino acids and non-pepditic bonds. Most exciting characteristic of cyclopeptides is a range of interesting bioactivities such as antibiotics gramicidin-S (2), vancomycin (3) and daptomycin (4), immunosuppressive cyclosporin-A (1) and astin-C (8), and anti-tumor aplidine (5), RA-V (6) and RA-VII (7). Compounds 1-4 are being used in clinics; compounds 5-8 are in the stages of clinical trial or as a candidate for drug research. In this review, the progress in chemical and bioactive studies on these important natural bioactive cyclopeptides 1-8 are introduced, mainly including discovery, bioactivity, mechanism, QSAR and synthesis.
Animals ; Anti-Bacterial Agents ; chemical synthesis ; chemistry ; pharmacology ; Antineoplastic Agents ; chemical synthesis ; chemistry ; therapeutic use ; Cyclosporine ; chemistry ; pharmacology ; Daptomycin ; chemical synthesis ; chemistry ; pharmacology ; Depsipeptides ; chemical synthesis ; chemistry ; therapeutic use ; Gramicidin ; chemical synthesis ; chemistry ; pharmacology ; Humans ; Immunosuppression ; Immunosuppressive Agents ; chemical synthesis ; chemistry ; pharmacology ; Molecular Structure ; Neoplasms ; drug therapy ; Peptides, Cyclic ; chemical synthesis ; chemistry ; pharmacology ; therapeutic use ; Quantitative Structure-Activity Relationship ; Vancomycin ; chemical synthesis ; chemistry ; pharmacology

OBJECTIVETo look into the serological characteristics of a hepatitis E outbreak.

METHODSSera from the first five patients with acute icteric hepatitis who developed the disease successively within ten days and the 1,675 employees routinely having their lunch in a dining hall of a department (outbreak population) were examined for anti.HEV IgM and IgG at 26th days after the outbreak, and the 883 employees of a neighboring department not having their lunch in the hall were selected as control (control population).

RESULTSThe five patients were all positive for anti-HEV IgM and IgG. The positive rates of anti-HEV IgM and IgG in outbreak population were 8.7% and 38.4% respectively, both significantly higher than those in control population which were only 0.1% and 28.6%. The numbers with abnormal ALT in the 145 individuals with anti-HEV IgM(+) of outbreak population were significantly higher than those in the IgM(-) individuals of the same group as well as in control, while the abnormal ALT ratio in the IgM(-) individuals of the outbreak was not higher than that in control. The results from the four patients' serial sera showed that the anti-HEV IgM titers declined gradually and were undetectable at about 4th month after infection, and the IgG titers increased to peak in about 2-3 months after infection, then declined very slowly. The mean IgG titer of the anti-HEV IgM(+) individuals was significantly higher than that of the IgM(-) but IgG(+) individuals in outbreak population, and the latter was significantly higher than the IgG(+) individuals in control, which suggested that the post-infection individuals' immunities to HEV were boosted during the outbreak. There was no difference between sex or age groups for the anti-HEV IgM(+) ratio, but the abnormal ALT was much more frequent in the anti-HEV IgM(+) male than in the female, and no difference was observed between age groups.

CONCLUSIONThe pathogen of the outbreak of acute icteric hepatitis was hepatitis E virus and associated with food intake. Anti-HEV IgM and IgG were used not only for diagnosis of hepatitis E but also for surveilance in mass population. The attack risk was not associated with age or sex, but the abnormal ALT was much more frequent fresh infectors in male.

Adult ; Disease Outbreaks ; Female ; Hepatitis Antibodies ; blood ; Hepatitis E ; epidemiology ; Hepatitis E virus ; immunology ; Humans ; Immunoglobulin G ; blood ; Immunoglobulin M ; blood ; Male ; Middle Aged ; Seroepidemiologic Studies

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Objective: To investigate the effect of Clerodendrum bungei-containing serum on liver cancer MHCC97-H cells and its possible mechanism from the perspective of phosphatidylinositol 3-kinase(PI3K)/protein kinase (Akt) signaling pathway. Method: The medicinal serum of 15% C. bungei was used to treat MHCC97-H cells. The effect of serum containing C. bungei on cell proliferation was observed by cell counting kit-8(CCK-8) method, in order to select the best time and concentration. The apoptosis was detected by Annexin V-FITC/PI double staining method. Western blot was used to detect the posphatase and tensin homologous gene deleted from chromosome 10 in key proteins (PTEN), phosphoprotein kinase B (p-Akt) and phosphatidylinositol 3-kinase (PI3K)-related protein expression of PI3K/Akt signaling pathway. Real-time PCR was used to detect C. bungei-containing serum on cells for 72 h after activation of nuclear factor-activated B cell kappa light chain(NF-κB) and tumor necrosis factor-α (TNF-α) mRNA expression. Result: The results of CCK-8 showed an inhibitory effect of the C. bungei-containing serum on the proliferation of tumor cells in a dose and time-dependent manner. Among them, the high-dose group had the most obvious inhibitory effect, and the maximum inhibition rates at 24, 48,72 h were 28%, 32%, and 43%, respectively. The results of flow cytometry showed that with the increase of drug-containing serum concentration, the cell growth was observed. The inhibition rate of cells was increased to different degrees, and the inhibition effect was significantly increased in the 72 h intervention group (P<0.01). The maximum apoptosis rate of the C. bungei-containing serum group was 19.48% and 19.72%, compared with the blank group. The difference was significant (P<0.05). The results of Western blot showed that the expression of PTEN in different groups increased with different concentrations of C. bungei-containing serum (P<0.05), and the expressions of PI3K and p-Akt decreased (P<0.05). Real-time PCR results showed that the C. bungei-containing serum could down-regulate the expression of NF-κB and up-regulate the expression of TNF-α mRNA (P<0.05). Conclusion: The medicinal serum of C. bungei can effectively inhibit the proliferation of MHCC97-H hepatoma cells and promote its apoptosis, which may be related to the PI3K/Akt signaling pathway and its key factors.