Electromagnetic Fields ; adverse effects ; Humans ; Radiologic Health

Objective: To improve the diagnosis and treatment level of secretory otitis media (SOM) of children. Method :Clinical information of 80 children with SOM were colletcted and analysed. All of the 80 cases (144 ears)were treated by myringotomy with Grommet insertion. Among them, 30 cases by adenotonsillectomy. 10 cases by palatoplasty. Secretions of 54 ears were carded out by bacterial culture. Result:80 cases were followed up for 6 to 12 mothes. 120 ears of 144 were cured (83％) ,with hearing improved. The tympanograms and hearing threshold of pure tone were found to be normal. The Gram＇s positive and negative germs of bactevial culture were 20.7％ (6/29 samples ) and 24％ (6/25 samples ) respectively. Conclusion: Children with secretory otitis media should be treated as early as posible to improve the patients＇ hearing and develope their speech.

Comprehensive evaluation for colleges of stomatology is a complex systematic engineering, which is affected by the determination of index and weight. Based on the previous research results,this study establishes a comprehensive evaluation index for colleges of stomatology in China by applying Delphi method,carrying out two-round consultation to 45 experts,which includes 4 first layer indicators and 21 second layer indicators.

At present,in the opinions of the domestic and foreign scholars,the only hope of long-term survival even cure of hilar cholangiocarcinoma was obtained by radical resection(ie R0 resection).The application of preoperative assessment with appropriate and comprehensive strategies can judge the respectability and Intraoperative safety accurately to the tumor,thereby it can improve the radical resection rate and safety of patients with hilar cholangiocarcinoma.In this paper,preoperative assessment strategies are reviewed.

Objective The clinical effect of Allitride as disinfectant in infective root canal of deciduous teeth was studied. Methods 40 teeth were put into the cotton thist with Allitride juice in root canals,sealed by zno for a week. FC CP were used in the contrast groups with consist of 38 teeth. Results The effect of 24 teeth in the Allitride group were excellent, 13 teeth were benign, The efficiency was 92 percent. In CP group, 8 teeth were excellent, 5 teeth were benign, The efficiency was 72 percent. 11 excellent effect and 7 benign effect were in FC group. The efficiency was 90 percent. There are significant difference between Allitrade group and GP group(P0.05). The Allitride effect have not significant relation with age, tooth position.Conclusions Allitride is a good disinfectant adapt to infective root canal of deciduous teeth.

Objective:To establish a system for quantitatively measuring alveolar bone density and to test its precision and validity. Methods: With the aid of computer technique, the system measured the average gray level intensity of regions of interest (ROIs) on standardized exposed direct digital periapical radiograph. To correct the variation resulting from exposure condition, an aluminum stepwedge was exposed simultaneously. By referring the image of aluminum stepwedge on each radiograph the equivalent aluminum thickness(EAT)and corrected gray level intensity(CGL)of the ROIs could be calculated as indicators of alveolar bone density. Nineteen specimens containing different amounts of hydroxy-phosphorite were radiographed. The precision of the system was tested by repeatedly measuring 2 of the specimens. The set of specimens was exposed under two different exposure time in order to test the system's validity to correct the gray level difference caused by different exposure time. Results: After repeated measurement of specimens, we found the Relative Standard Deviation(RSD) of EAT and CGL was between 0.83%-2.15%; At the level of 95%, if the difference of EAT between the two ROIs was larger than 0.05 mm or the difference of CGL was larger than 3, the content of hydroxy-phosphorite in them was different; The two sets of data during different exposure time were processed with Wilcoxon Signed Ranks Test, and the result showed effective correction of the variation caused by different exposure time. Conclusion:The precision and validity of the quantitative alveolar bone density measuring system are acceptable. The system can be used to compare alveolar bone density longitudinally and cross-sectionally.

0.05), and there was significant differences in the negative score of PANSS (t=6.13, P

Objective To analyze the genetic diversity of snail populations from five provinces in China mainland. Methods Genomic DNA was amplified by random primer and the products were electrophoresed by 8% polyacrylamide and stained by 0.6% silver nitrogen. The results were recorded and analyzed. Results The average similarity and match percentage among the nine snail populations were 0. 721 4 and 0. 680 9 respectively. The cluster trees showed that the nine snail populations could be divided into three groups ; snails from Dali of Yunnan Province and Puge of Sichuan Province were the first isolated group; snails from Fuqing of Fujian Province and Dongtai of Jiangsu Province were clustered into the second group; the other four populations from Anhui Province and snails from Yixing of Jiangsu Province belong to the last group. Conclusion There is a large diversity among smooth-shelled snails in China although close relationship exists. The cluster trees gained by different snail populations are basically the same and consistent with the distribution of these populations. However, further study should be carried out on the cluster of smooth-shelled snails from Dongtai of Jiangsu Province.

Diabetic macular edema (DME) is thickening retina with two disc diameter,which is the leading cause of blindness in diabetic retinopathy patients.The initial studies demonstrated that laser treatment of DME prevented further visual deterioration but did not improve visual acuity.Although glucocorticoid slow-release system can extend the time of effective drug concentration,to help glucocorticoid better carry out its biological effect,further studies are needed to warrant their safety due to increasing intraocular pressure and cataract progression.Novel studies identifying the presence of vascular endothelial growth factor (VEGF) in the eye with DME allowed for the development of an alternative anti-VEGF therapy,which revolutionized the management of DME by not only preventing vision loss,but also improving overall vision.Anti-VEGF therapy is becoming the first-line treatment of DME.However,present treatment modalities including anti-VEGF for DME had limitations,which build on the current understanding of DME pathogenesis.Further in-depth study of the development and outcome of DME is needed to optimize the therapeutic schemes,based on objective and scientific observation of treatment response.Finally we need to fully utilize the public health services and clinical management resources for diabetic patients,to prevent the visual impairment of DME before its occurrence.

Pertussis is an severe infectious respiratory disease that continues to be a serious public health problem,which is caused by Bordetella Pertussis.Because it's highly infectivity,it is still an important etiological factor associated with persistent cough in adults and adolescents.With the introduction of mass vaccination in 1974,there has been a dramatic decrease in the morbidity and mortality.However,in recent years,increasing numbers of pertussis are reported in adolescents and adults in many countries where with high vaccination coverage.The thesis summarize and discuss the progress of pertussis cpidemiology and clinical characteristics.