Objective: To evaluate the influence of retention-form design of resin bonded fixed partial dentures(RBFPDs). Methods: Forty-five metal replicas of posterior metal RBFPDs were divided into 3 groups(n=15):C shape(control group), C shape + axial groove, C shape + pin hole. All the replicas were luted with Panavia F cement and subgroup of 5 specimens were subject to 70 N compressive load cycling for 0 cycles, 240 000 cycles , and 1 200 000 cycles respectively .Half of the cycles was on the central fossa of the pontics and half on the buccal inclined surface of the lingual cusp. Forces for dislodgment of the specimens were applied along the long axis of the abutment at a crosshead speed of 1.0 mm /min. The separation forces were recorded as maxium retention force at the time of dislodgement. Results: Se-paration forces of the C shape group (566.82?71.59 N)0.05). After 1 200 000 cycles, the retention force of the RBFPDs decreased significantly (P

Decision Making, Organizational ; Disasters ; Earthquakes ; Humans ; Public Health Practice ; Stress Disorders, Post-Traumatic

The effects of chitosan and N,O-carboxymethyl chitosan on blood hemostasis are tested.The dynamic blood coagulation experiments show chitsan with low deacetylation degree has higher absorption ability.The experiments can't find that any altered red blood cell morphology or an unusual affinity between erythrocytes appears evidently in the ACD blood treated with chitosan.The concentration of the platelets on the chitosan surface may be one of causes that platelets produce blood coagulation.Chitosan is substituted by the carboxymethyl and has water solubility.But N,O-carboxymethyl chitosan can lead torouleau and not toaltering the morphology of the erythrocyte.The blood hemostasis effect is not obvious.The values of TT,PT,APTT and FIB are measured from blood and the results fail toprove that chitosan and N,O-carboxymethyl chitosan can activate the coagulation factors.

Chitosan have applied extensively in the field of medicine. We review the mechanism of chitosan hemostasis. The effect of chitosan on hemostasis is independent of all known“Cascade-like”coagulation pathways,induding platelets and soluble coagulant factors. Chitosan induce hemostasis by coalesce erythrocytes to one another to form a blood clot. In addition,the use of chitosan in hemostat is indicated in this paper.

Congresses as Topic ; Humans ; Otorhinolaryngologic Surgical Procedures

Objective The objective of digitalized patient records control is to meet some new demands set on patient records control under the new circumstances. Methods A computer system for digitalized patient records control and supporting processing, management and applications setups were established. Results The system put the contents of the patient records into various categories with difierent standards and designed relatively strict means of authorization. It rendered patient records easier to use and their control more strict, making it possible to make general use of the records without access to the original documents. As a result, data loss was avoided, authority over the data was put under control, data sharing was provided, and full and convenient use of data was realized. Conclusion Digitalized patient records control, a form of shaping computer-based patient records before the latter fully comes into being, enhances the efficiency of patient records application and reduces the pressure of paper records storage. It is a practical and effective way of controlling patient records.

To study the etiology and treatment of relapsing polychondritis, especially tracheostenosis, 3 patients with severe relapsing polychondritis complicated with severe tracheostenosis were presented. The clinical features, criteria of diagnosis, etiology, therapy and prognosis were discussed. All the 3 cases were female. They were misdiagnosed as laryngopharyngeal inflammation with severe tracheostenosis, so that their correct diagnosis and treatment were delayed. The report and discussion of such cases are helpful to its early diagnosis and improve ment of their prognosis.

Objective To explore the efficacy and safety of the treatment of Xuezhikang and fluvastatin in elderly angina patients with mildly abnormal liver function .Methods 84 cases of ALT in 40-80u/L very elderly patients with coronary heart disease were randomly selected and divided into the two groups , the Xuezhikang group received Xuezhikang (0.6g,bid,orally),the fluvastatin group received fluvastatin (40mg,1time/night,oral),the total course was 12weeks,the TC,TG,LDL-C,HDL -C were measured before and after treatment ,liver function was measured once 2 -4times.If ALT was 3 times higher than before , Xuezhikang was instead of statins , if ALT was 5 times higher than before ,both of the two drags were withdrawaled .Results The TC,LDL,TG,HDL-C and ALT of the two groups were no significant difference before treatment (P >0.05),the TC,LDL,TG were decreased after treatment in the both group .There was no case of increased of ALT to three times in Xuezhikang group ,however ,ALT of 6 patients were increased more than three times in fluvastatin group ,four weeks after exchange of Xuezhikang ,the ALT were not continued to rise .Conclusion Both the two medicine can significantly lowered the cholesterol in very elderly patients with angina ,but the Xuezhikang were more safety in the patient with mild increased of liver function .

Environmental physiological method adopted, the ergonomic experiment is to seek the best parameter of the protective hood structural size, on which the structure design of the protective hood will be based, through the analysis of the organic relationship between the microenvironment of power air-purifying medical protective hood and the body's physiological characteristics. The changes of such indexes due to different air currents are analyzed as the oxygen, carbon dioxide, temperature and humidity in the microenvironment. The changes of testees' physiological parameters and their responses to psychological loads and body strengths are paid attention to. The results show the hood can meet the testees' demands with proper air current.

Objective Study and determine the suitable negative pressure condition for a negative pressure isolator. Method The filter efficiency, pressure, capabilities of inner environment and physiological parameters of the user were tested in different negative pressure conditions. Results The different negative pressure conditions influence above mentioned capabilities of the isolator considerably except for the filter efficiency Conclusion Under the conditions of -30Pa～-50Pa,those are optimized the capabilities of inner environment and physiological parameters of the user.