Ameloblastoma ; pathology ; Bone Neoplasms ; classification ; genetics ; pathology ; Chondromatosis ; pathology ; Chondrosarcoma ; classification ; pathology ; Enchondromatosis ; pathology ; Humans ; Osteosarcoma ; classification ; pathology ; Sarcoma, Ewing ; pathology ; Societies, Medical ; United States ; World Health Organization

Objective To investigate the clinical effect of chronic dacryocystitis through dacryocystorhinostomy.Methods The clinical data about 104 eyes in 84 chronic dacryocystitis patients who treated by dacryocystorhinostomy were analyzed.Than summarized and analysed the preoperative preparation,operation method and the curative effect after operation.Results The 104 eyes operation were all successful.The patients followed up for 6 to 24 months.96 eyes had no symptom of tear overflows and overflow pus(approximately 92.31%),2 eyes recurrenced after 1 year,then after operation recovered again(approximately 1.92%),4 eyes had symptom of tear overflows,but tear road washing unobstructed (approximately 3.85%),2 eyes lost to follow up(the rate Was about 1.92%).Conclusion The clinical treatment on the chronic dacryocystltis by dacryocystorhinostomy was effective and the recurrence rate wag very seldom.

Objective:To analyze and compare the dose monitoring and control systems of two types of medical linear accelerator systematically from the view of mechanical and electrical engineering, and establish the method of the quality assurance of the dosimetry system and the solution in the routine maintenance.Methods: To systematically compare and analyze the system of dose monitoring and control for two types of linear accelerators (Precise Elekta and C-series of Varian Medical Systems) from twofold aspects that included machine physics and electric engineering of medical linear accelerators.Results:The monitoring system that took ionization chamber as center was established between connotation of machine physics and concrete realization of electromechanical engineering, and explained the difference and similarity between open type and sealed type of ionization chamber, and the theory that Precise series needn't be serviced by PFN.Conclusion: Based on the analysis of ionization chambers structure of medical linear accelerators on the principle of quality assurance system, proposed dosimetric testing and adjustment method, and provide reference for the establishment of quality assurance system and technical procedures of the maintenance engineering.

Metabolic disturbances such as hypertension and insulin resistence,as well as cardiovascular events are more frequent in primary aldosteronism patients than in essential hypertension patients.When the diagnosis of primary aldosteronism is made,more attention should be paid to the associated metabolic disturbances and cardiovascular events,which may benefit the prognosis of patients.

Serial sections of human embryos and the brain stem together with cerebellum offetuses, young and adults were studied by Cajal I and Nissl methods for demonstratingthe development and connections of mesencephalic nucleus of the trigeminal nerve. It was found that at C.R. 12.4 mm the mesencephalic root with some scattered cellgroups made its appearance along the sulcus limitus from the entrance of the trigeminalnerve up to the isthmus region. At C.R. 56mm it extended into the midbrain regionand the base of the cerebellum. Later on, the root cells differentiated in a caudo-rostraldirection. They were therefore somewhat larger in its caudal part than those in the ros-tral. With the increase of age the morphology of the mesencephalic root cells alsochanged from the fetal multipolar type to the adult unipolar. The present study confirm the previous observations that the mesencephalic root hadconnections with some cranial nerves and the cerebellum. And in addition, some scat-tered mesencephalic root cells were found in the posterior commissure, in its nucleus andin the interstitial nucleus. Discussion on their functional significance were made.

17 young healthy rabbits weighing from 520 to 720 gins,ageing 38～48 postnatal days,were used for this study.Seven to fourteen days following spinal lesions at diffe- rent levels the animals were killed and serial transverse sections of thc brain stem were stained with thionin,the retrograde cell degenerations within the red nucleus were studied. An analysis of the chromatolysis indicates that the rubrospinal fibers are largely crossed and a few fibers to the cervical cord are uncrossed.Furthermore,a somatotopical localization exists within the contralateral red nucleus with respect to the rubrospinal tract,i.e.the cervical projections of the fibers system take origin from the dorsal part of the red nucleus almost throughout its whole extent,the thoracic projections from the ventral part of the caudal five-sixths of the red nucleus,and the lumbar projections from the centro-ventral part of the caudal third of the nucleus. It also indicates that all types of cells in the red nucleus,not only the large ones, give rise to the rubrospinal tract.The spinal porjections of this fiber tract may descend as far as the lumbar cord.

[Objective] To improve the way of establishing myocardial ischemia reperfusion rat model.[Methods]30 SD rats,quality(220?20)g,male,randomly split into normal model group and improved model group,improved established model ligation with a 0.6mm diameter line,and drawn after 30min.Compare such a method with normal model.[Results] In the context of keeping experimental stability,the reduced heart rate,wake time and survival rate of the way of improved established model respectively are(50?20)/min,(15?5)min,86.67%,but it is just(120?20)/min,(80?20)min,66.67% of the normal model group.[Conclusion]The improved myocardial ischemia reperfusion model offers significant superiority to the former one.

AIM:To study effects of resveratrol on osteoprotegerin(OPG)and receptor activator of NF-?B ligand(RANKL)expression in femur of ovariectomized rats.METHODS:48 female SD rats(3 months old)were assigned into 6 groups randomly:sham-operated group(SHAM);ovariectomized group(OVX);17?-estradiol replacement therapy group(ERT,0.1 mg?kg-1?d-1,sc);high-dose resveratrol-treate group(RH,40 mg?kg-1?d-1,i.p.);middle-dose resveratrol-treated group(RM,20 mg?kg-1?d-1,i.p.);low-dose resveratrol-treated group(RL,10 mg?kg-1?d-1,i.p.).Except for SHAM group,rats in other groups were operated by bilateral ovariectomy.Administration started at the 8th day after operation and lasted 8 weeks.At the end of the 9th week after operation,all rats were sacrificed.The bone mineral density(BMD)and vitodynamics properties(including ELASTIC,M-STRESS,M-LORD and STIFFNESS)of femurs were measured.The expression of OPG and RANKL in femurs of rats were observed by immunohistochemical staining methods.RESULTS:Compared with OVX group,resveratrol treatment(40 mg?kg-1?d-1 and 20 mg?kg-1?d-1)increased expression of OPG in femurs while decreased expression of RANKL in ovariectmized rats.In RH,RM,and ERT group,BMD,ELASTIC,M-STRESS of femurs were higher than those of OVX group.CONCLUSION:Resveratrol increased expression of OPG in femur while decreased expression of RANKL in ovariectmized rats,which was probably one of mechanism that resveratrol improve osteoporosis.

BACKGROUND: Most of the dental metal repair materials contacting Ti implants will cause galvanic corrosion and local environment with positive electricity on the implant interface, which directly affects the status of the tissues, especially bone resorption.OBJECTIVE: To evaluate the galvanic corrosion of commercially pure Ti (TA2 type) coupled with Au alloy, CoCr alloy, Ti alloy, and NiCr alloy in vitro. METHODS: Circuit of commercially pure Ti contacting with Au alloy, CoCr alloy, Ti alloy, and NiCr alloy was simulated in vitro in artificial saliva, and the common potential and galvanic current in 15 hours were recorded to draw current-time curves. RESULTS AND CONCLUSION: The galvanic current became stable after 8 hours of contacting. The galvanic current was the greatest in Ti/Au, followed by Ti/CoCr, Ti/Ti alloy, and then Ti/NiCr. Results indicated that the galvanic corrosion of the couple of Ti and Au alloy is the lowest. Au alloy is the most suitable material for implant superstructure. The galvanic corrosion of the couple of Ti and NiCr alloy is the highest, so NiCr alloy is not acceptable for implant superstructure.

To explore the feasibility of sevoflurane used in obstetric anesthesia and examine its effects on neonatal Apgar scores.A total of 60 cases of term primipara were assigned into epidural anesthesia assisted sevoflurane inhalation group (experimental group,n =30) and epidural anesthesia group (control group,n =30).In the experimental group after skin incision,the patients could not tolerate the anesthesia mask inhalation of sevoflurane.And the control group received no adjuvant drug.The maternal inhalation of sevoflurane to delivery of fetus after 1 min,5 min,10 min Apgar scores were analyzed.And the inhalation of sevoflurane to fetal childbirth duration were 4-10 min in two groups.The intergroup difference of newborn Apgar scores had no statistical significance (P ＞ 0.05).Epidural anesthesia assisted sevoflurane inhalation for cesarean section had no significant effect on neonatal Apgar scores.