SUMMARY In this article , different methods to deal with teeth fractures were discussed by presenting a case of traumatic crown-root fracture in the anterior esthetic zone .The traumatic crown-root fracture is a common problem in clinic .When a fracture line locates in close proximity to or below the alveolar bone crest , the fracture most likely involve the junctional epithelium and the connective tissue attachment .This type of fracture becomes a challenge for restorative dentists because it involves biologic , functional , and es-thetic considerations , especially when the fracture occurs in an esthetic area .In this case , a young patient presented with two fractured upper anterior teeth to the Department of Periodontics , Peking University School and Hospital of Stomatology .After the comprehensive clinical evaluation , the right central incisor was decided to extract for implant therapy and the right lateral incisor was decided to retain by one modified crown lengthening surgery .The most common technique applied to save a retained root is a clinical crown lengthening procedure .However , the aggressive alveolar bone resection of both target and adjacent teeth to reestablish the bone width and periodontal health may compromise functional and esthetic outcomes .To re-duce loss of excessive osseous tissue during osteotomy procedure , the modified crown lengthening of the right lateral incisor was performed , including minor bone resection and root reshaping .Regarding the right central incisor , the retained root was all located below the alveolar bone crest .The extraction and implant procedure , combined with guided bone graft were performed to avoid the damage to neighbor teeth during traditional restorative therapy and to reshape a preferable buccal contour .At the last visit , the patient was recalled with healthy periodontium , normal tooth function and favorable esthetic results .

Aim To test the skin healing and repairing efficacy and the mechanism of Hibiscus rosa-sinensis L bud extract by using the animal models. Methods KM mice were randomly divided into three groups:the model group, the positive control group, and the n-bu-tyl alcohol extract ( HrBN) group. Using the boils and carbuncles model, the healing condition of all the animals were observed. KM mice were kept in the SPF condition room and divided into five groups: the model group, the positive control group, and the low, middle, high dose groups. Using the full-thickness loss model, the repairing results of all the mice were ob-served. Through the antimicrobial test, the results of MIC and inhibition zone were obtained. The carbon clearance test was used to collect the blood at the time 5min and 15min, and get the liver and spleen, and the results of K andαwere obtained. Results In vivo ex-periments showed there was significant difference be-tween groups;the HrBN extract had the outstanding ef-ficacy in healing and repairing skin boils and full-thickness loss models. It had higher recovery rate than other ethanol extract, such as ethyl acetate extract and chloroform extract. In vitro experiments showed that the HrBN extract, ethyl acetate extract ( HrBE) ,AB-8 macroporous resin 30% alcohol part and 60% alcohol part had obvious antimicrobial efficacy. The carbon clearance test showed HrBN had a good effect in im-proving immune function, and it can increase the K and α. Conclusion HrBN in animal models exerts good skin healing and repairing efficacy, which might be related to its antibacterial activity and immunologic enhancement function.

Objective:To explore the action path and the potential mediating effects of depression and physical diseases on the influencing factors of mild cognitive impairment(MCI) in community, and provide the theoretical basis for the construction of the strategy of cognitive regulation.Methods:A convenient sample survey was conducted on 252 mild cognitive impairment patients in the community undergoing screening using the general information questionnaire, Montreal cognitive assessment scale(MoCA) and geriatric depression scale(GDS-15)from January 2018 to June 2019. SPSS 22.0 and AMOS 22.0 softwares were used to conduct descriptive analysis, correlation analysis, structural equation model and confirmatory factor analysis.Results:The score of MoCA was 19.66±3.90 for all MCI patients. There were significant correlations among age, education, social frequency, physical exercise frequency and depression degree, the number of physical disease and MoCA( r=-0.440-0.487, P<0.01). The structural equation model fits well(χ 2/ df=2.476, TLI=0.885, CFI=0.916, GFI=0.919, AGFI=0.871, RMSEA=0.077). Mediation modeling analysis showed that age, education, social frequency physical exereise frequency had a direct effect on cognitive function(effect value was -0.183, 0.458, 0.237, 0.174, P<0.01). There were partly mediating effect of the number of physical disease between age, education, physical exercise frequency and cognitive function(effect value was -0.106, 0.078, 0.075, P<0.01), and there were partly mediating effect of depression degree between age, social frequency, physical exercise frequency and cognitive function(effect value was -0.075, 0.080, 0.050, P<0.01), and there were chain mediating effect of the number of physical disease-depression degree between age, education, physical exercise(effect value was -0.028, 0.031, 0.019, P<0.01). Conclusion:The cognitive management of MCI among community should focus on the elderly, low education level groups.In the implementation of exercise intervention to improve cognitive function of health management strategy, while to strengthen the effective management of physical diseases and negative emotion evaluation and dredging, to increase the effect of exercise intervention on cognitive function improvement.

Objective:To evaluate the direct and sustained effects of multitask-process cognitive training program on cognitive function in the community elderly with mild cognitive impairment(MCI).Methods:Ninety-two participants with MCI who met the inclusion criteria were randomly selected from Huzhou community of Zhejiang province.According to the allocation ratio of 1∶1, the MCI participants were randomly divided into the cognitive training group and the control group, with 46 cases in each group.The participants in control group were received a cognitive function-health education program, and the participants in cognitive training group received an additional 10 weeks of multitask-process cognitive training.Respectively in three-time points of at baseline, after 10 weeks of training, and a 3-month follow-up to evaluate all participants with MCI executive function tested by trail making test A-B and Stroop color-word test, overall cognitive function tested by MoCA scale.Repeated measure ANOVA was used to compare the between-group variation, time effect and interaction effect of two groups at 3 time points.Results:The MoCA score of intervention group at T0, T1, T2 were 19.09±1.98, 21.09±1.41, 21.11±1.27 respectively, and the MoCA score of the control group were 18.24±2.22, 18.57±1.86, 18.07±1.90 respectively.Compared with the control group, the score of MoCA in the intervention group was significantly improved at T1 and T2 ( P< 0.05). Compared with control group, the Trail making test A-B, Stroop color-word interference test of intervention group were improved at T1, T2 ( P<0.05). Repeated measurement ANOVA shows that there were significant differences in Trail making test A-B, Stroop color-word interference test and MoCA between the two groups in terms of between-group effect, time effect and group-time interaction effect ( F=9.245~196.457, P<0.05). Simple effects analysis shows that compared with the control group, the multitask-process cognitive training had a positive direct effect on the Trail making test A-B, Stroop color-word interference test and MoCA, and these improvements maintained until the end of a 3-month follow-up ( F=2.757~201.829, P<0.05). During the research period, the compliance rate of the cognitive training group was 87.4%, and no adverse events occurred. Conclusion:The multitask-process cognitive training program positively promote the cognitive function of participants with MCI and provide a set of standardized and procedural nursing intervention program for the cognitive management of community participants with MCI.

Objective:To evaluate the rapid diagnostic value of serum novel coronavirus (2019-nCoV) IgM/IgG detection in COVID-19, aiming to further improve the diagnostic and screening system of COVID-19.Methods:Blood samples were collected from 32 patients with COVID-19 (tested positive for 2019-nCoV nucleic acid by RT-PCR and presented with clinical symptoms) and 34 non-COVID-19 patients (tested negative for 2019-nCoV nucleic acid by RT-PCR and clinically confirmed as non-COVID-19 patients). Colloidal gold-based immunochromatography was used for rapid detection of 2019-nCoV IgM/IgG in these samples. The sensitivity and specificity of the test, and the correlation of serum 2019-nCoV IgM/IgG with disease course were analyzed.Results:Among the 32 COVID-19 patients, nine tested positive for 2019-nCoV IgM with a positive rate of 28.1% (9/32) and 25 positive for 2019-nCoV IgG with a positive rate of 78.1% (25/32). The total positive rate was 84.4% (27/32). Two of the 34 non-COVID-19 patients tested positive for 2019-nCoV IgG with a positive rate of 5.9% (2/34), while none of them was positive for 2019-nCoV IgM. The positive rates of serum IgM were 42.9% (3/7), 30.8% (4/13) and 16.7% (2/12) at 10-20 d, 21-30 d and 31-40 d after the patients developed the symptoms of COVID-19, respectively, which showed a decreasing tread with prolonged disease course. The positive rates of serum IgG in COVID-19 patients were 57.1% (4/7), 84.6% (11/13) and 83.3% (10/12) at 10-20 d, 21-30 d and 30-40 d after symptom onset. The rate showed an increasing trend with prolonged disease course and reached the peak in about 21-30 d.Conclusions:Serum 2019-nCoV IgM/IgG detection (using colloidal gold method) had high sensitivity (84.4%) and strong specificity (94.1%) in the diagnosis of 2019-nCoV infection. It had a great value in the diagnosis and screening of COVID-19 and could be used as a valuable complementary method to the COVID-19 diagnostic system due to its advantages of flexibility, rapidity and simplicity.

Objective: To observe the long-term clinical treatment outcome and the influencing factors of the outcome for the teeth receiving modified crown lengthening surgery combined with root canal treatment and post-core crown restoration. To summarize the clinical guidelines of modified crown lengthening surgery in selection of indications and for mulation of treatment planning. Methods: Fifty-seven patients with a total of 67 teeth receiving modified crown lengthening surgery combined with root canal treatment and post-core crown restoration for at least a 6 months' follow-up period between July 2004 and July 2013 were recruited in this retrospective study by phone call interviews. The patients' clinical outcomes were evaluated by the combination of clinical examination, radiograph and questionnaire regarding patient-reported outcome of the last follow up (≥9 months post modified crown lengthening surgery and ≥6 months after definite crown restorations). All of the treated teeth were classified into two groups, group A (teeth with good clinical treatment outcome) and group B (teeth with poor clinical treatment outcome), based on the defined criteria including patients' satisfaction with the function and esthetics of the teeth and absence of periodontal, endodontic and prosthodontic complications. The potential influencing factors of clinical treatment outcome were also determined by Logistic regression analysis. Results: Vertical root fracture in 1 tooth was found on its periapical film and the tooth was deemed hopeless. Thus, the survival rate is 99% (66/67) for the multidisciplinary treatment approach. Seventy-two percent (48/67) of the teeth achieved good clinical treatment outcome and 28% (19/67) of the teeth developed one or several complications. In group B (teeth with poor clinical treatment), 16 out of teeth exhibited periodontal complications with bleeding on probing (BOP) positive mostly found. Logistic regression analysis demonstrated that plaque control (OR=21.392, P=0.014), edge form (OR=7.610, P=0.011), and smoking experience (OR=7.315, P=0.018) were the risk factors influencing the clinical treatment outcome of modified crown lengthening surgery combined with root canal treatment and post-core restoration. Conclusions Modified crown lengthening surgery combined with root canal treatment and post-core restoration has a good and stable clinical effect in the observational time of 6-114 months. Plaque control, smoking status and edge form of the tooth appeared to be the influencing factors of this multidisciplinary treatment approach.