Objective To analyze the characters of occlusal contact in patients with severe tooth wear. Methods The characters of occlusal contact in 20 cases with severe tooth wear and 20 persons with normal occlusion were measured with T-Scan Ⅱ occlusal analysis system. Results The offset degree in quantitative analysis showed that the offset in transversal and offset distance of center of force in the group with severe tooth wear[ ( 10. 5 ± 1.5 )mm, ( 12. 0 ± 1.3 ) mm ] were larger than control group [ (4. 5 ± 0. 8 )mm,(6. 5 ±0. 8)mm]. Occlusion time in severe tooth wear group[ (0.45 ±0.07)s]was shorter than control group(o)(0.78 ±0.06)s]. Lateral disclusion time in severe tooth wear group[ ( 1. 50 ±0. 08)s, ( 1.50 ±0.10) s ] was longer than control group [ ( 0. 93 ± 0. 07 ) s, ( 0.90 ± 0.11 ) s ]. Incidence rate of lateral occlusal interference in severe tooth wear group(70%) was higher than control group( 10%) (P ＜0.05). Offset in vertical of center of force [ ( 4.9 ± 1.0 ) mm ], protrusive disclusion time [( 1.02 ± 0. 09 ) s ], incidence rate of premature contact and protrusive occlusal contact interference( 20% ,30% ) showed no significantly statistical difference between two groups [ (4. 7 ± 0. 6 ) mm, (0. 96 ± 0. 06 ) s, 10% , 10% ] ( P ＞0. 05). Conclusion There were some differences in the characters of occlusal contact in patients with severe tooth wear.

Objective:To study the effects of hydroxycamptothecine(HC PT ) and pingyangmycin(PYM) alone or in combination(HCPT/PYM) on the proliferation and telomerase activity of human tongue carcinoma Tca 8113 cells.Methods :The growth inhibitary effects of HCPT or PYM on Tca 8113 cells were stu died by MTT assay and the IC 30 values of the two drugs were obtained. Then the cells were exposed to HCPT or PYM at IC 30 , or to their combination. T he clonogenecity, cell cycle distribution, morphological change and telomerase a ctivity were studied by clonogenic assay, flow cytometry,transmision electron mi croscopy and telomeric repeat amplification protocol (TRAP) respectively.Results:IC 30 (ng/ml) of HCPT and PYM was 109 and 416 respectivel y, when in combination(HCPT/PYM) the IC 30 of HCPT and PYM was 35 and 100 r espectively. The clonogenecity(%) of the control, HCPT,PYM and HCPT/PYM treated cells was 31.7,11.6,15.2 and 4.1 respectively. PYM decreased S and G 2 phase ce lls,increased G 1 phase cells.HCPT or HCPT/PYM decreased G 1 phase cells and i ncreased S and G 2 phase cells.Drug treatment resulted in cell organ degenerati on and decrese of telomerase activity.The A value at A 450 of telomerase in control,HCPT,PYM and HCPT/PYM treated cells was 1.89?0.03,0.82?0.02,0.77?0.0 2 and 0.53?0.02 respectively(P

objective: To study the effects of hydroxycampothecin(HCPT), pingyangmycin(PYM), cis platinum (DDP) or their combination on the proliferation of human tongue carcinoma Tca8113 cells. Methods: MTT assay, cell counting,clonogenic assay and HE staining were used to study the effects of HCPT, PYM, DDP or their combination on the proliferation of human tongue carcinoma Tca8113 cells. Results: ①Synergistic inhibiton was observed when HCPT at the concentration (ng/ml) of 10～100 combined with PYM at 32～320 or DDP at 32～320, antagonistic effect was observed when PYM at 32～320 combined with DDP at 32～320; ②After treatment with PYM, HCPT or PYM plus HCPT at IC 30 the clonogenecity (%) of the cells was 15.2, 11.6 and 4.1 respectively, while that of untreated cells 31.7. Conclusion: The combination of HCPT with PYM may be synergistic in the inhibition of tongue carcinoma cell proliferation.

Objective To evaluate the sensitivity, specificity and clinical significance of CK19 mRNA, CEA mRNA and LUNX mRNA for detecting micrometastasis by sampling the peripheral blood and regional lymph nodes of lung cancer patients. Methods Reverse transcriptase polymerase chain reaction (RT-PCR) was used to detect LUNX mRNA,CK19 mRNA, CEA mRNA for micrometastasis by sampling the peripheral blood of 48 lung cancer patients and 44 regional lymph nodes of such patients treated by curative resection. Peripheral blood of 30 patients with pulmonary benign lesions and 10 normal healthy volunteers and lymph nodes of 6 patients with benign pulmonary diseases served as control. Results (1) LUNX mRNA, CK19 mRNA, CEA mRNA were expressed in all(35/35) lung cancer tissues. (2) In the peripheral blood from 48 lung cancer patients, 30(62.5%) were positive for LUNX mRNA, 24 (50.0% ) positive for CK19 mRNA and 32(66.7%) positive for CEA mRNA. The positive detection rates of micrometastasis in 44 lymph nodes from lung cancer patients were 36.4% (16 out of 44) for LUNX mRNA, 27.3%(12 out of 44) for CK19 mRNA and 40.9%(18 out of 44) for CEA mRNA. (3) In the 30 blood samples from patients with pulmonary benign diseases, 2 (6.7%) expressed CK19 mRNA, but none expressed LUNX mRNA or CEA mRNA. All the 3 molecular markers were negative in the 10 blood samples from healthy volunteers. In 11 lymph nodes from patients with pulmonary benign lesions, none was positive for any of the three markers.(4)In 44 regional lymph nodes from lung cancer patients,6(13.6%) were positive for metastasis by histopathological examination, with a positive rate significantly lower than that of the RT-PCR ( P

Objective: To evaluate the efficacy of the bispectral index (BI) in predicting patient movement on skin incision under sevoflurane anesthesia with the PK statistic. Method: Twenty-nine adult patients. scheduled for elective upper abdominal surgery, were selected. Anesthesia was induced with propofol and 4%-5% sevoflurane in oxygen and maintained with one of four randomized sevoflurane concentrations (0.6MAC, 1.0MAC. 1.5MAC and 2.0MAC) for fifteen minutes, then skin incision was performed by the surgeon at the planned site of the surgery, and each patient was observed carefully about 2 minutes to detect purposeful movement. The data of BI, 95% SEF, MAP, SABP and HR in one minute before skin incision were applied to statistically analysis. Result: The P_K was significantly greater than 0.5 for the sevoflurane level and the BI. The PK of 95% SEF. SABP and MAP were less than that of the level of sevoflu or Bl. but was significantly greater than 0.5 The P_K of HR was close to 0.5. Conclusion: These indicators of B, BP and 95% SEF may predict patient movement to skin incision under sevoflurane anesthesia. of which the BI is the most sensi tive.

Objective: To develop injectable tissue-engineered bone. Methods: Bone marrow cells isolated from lilac bone of New Zealand rabbits were cultured and induced to differentiate Into osteoblasts. The osteoblasts were mixed with 20 g/L alginate sodium solution to generate osteoblasts/alginate composite with final cellular density of 5 ? 10 6/ml. Calcium chloride was used as cross-linking agent. The osteoblasts/alginate composite was injected into the dorsal subcutaneous tissue of nude mice. The injected material with surounding tissue were examined with X-ray and histopathologic technique. Results: Four and eight weeks after injection, the hard knobbles were easily palpated under the dorsal skin of the animals. On X-ray photograph the knobbles showed calcified tissue image. In histological analysis, new bone formation was observed in the osteoblasts/alginate composite. The osteogenesis was in association with regenerated hematopoietic bone marrow. Conclusion: New bone tissue can be created through the injection of alginate sodium mixed with marrow stromal osteoblasts.

Objective: To investigate the method of using tubular demineralized tubular bone matrix scaffold composited with marrow stromal osteoblasts to fabricate tissue-engineered bone in vivo. Methods: Marrow stromal cells were harvested from illiac bone of 5 New Zealand rabbits respectively. After being cultured and multiplied in vitro, marrow stromal cells were induced to differentiate to osteoblasts with dexamethasone. The induced cells were harvested and mixed with 1.5% alginate sodium solution to generate a cell suspension. The suspension was dropped into tubular demineralized bone (1～1.5 cm in length, 0.2～0.5 cm in diameter) and then gelled with 2.5% CaCl 2. The demineralized tubular bone matrix/osteoblasts composites were placed in the dorsum of the rabbit subcutaneously as autogenous cells transplantation. Samples were investigated 6 and 12 weeks after implantation with histological and roentgenographic examination. Results: Osteoid tissue and new bone were observed in 4 weeks. In 8 weeks, more new bone formation, cells lied in the lacunae and arranged in order were found.Conclusion: Demineralized tubular bone matrix can be used as scaffold for the marrow stromal osteoblasts and alginate which was employed as three dimension carrier for cell growing and producing extral cell matrix.

Objective To investigate the protective effect of phycocyanin on focal cerebral ischemia reperfusion in rats.Methods The model of the middle cerebral artery occlusion and reperfusion(MCAO/R) was established using the intraluminal filament occlusion with 60 healthy adult male Wistar rats,and treated by phycocyanin.The expressions of NF-?B,IL-6 and neuronal apoptosis were detected to evaluate the effects of phycocyanin on above indexes.Results The expression level of NF-?B increased successfully from reperfusion 6h,peaked at reperfusion 1d,and then decreased in cortex and striatum in ischemic group.The expression site and change principle of IL-6 were similar to those of NF-?B except of expression peak at reperfusion 2d.The neuronal apoptosis increased successfully from reperfusion 6h,reached peak at reperfusion 1d and 2d in cortex and striatum respectively,and the changed character was coincident with NF-?B and IL-6 expressions.The expressions of NF-?B and IL-6 reduced and the number of neuronal apoptosis decreased significantly after applying phycocyanin compared to the control group in the same time.Conclusion Phycocyanin could inhibit neuronal apoptosis and down-regulate the expressions of NF-?B and IL-6 after cerebral ischemia-reperfusion.

Objective To establish hyperoxia retinopathy in premature rat model with SpragueDawley (SD),observe the pathological changes of angiogenesis and expression of vascular endothelial growth factor (VEGF),and compare the effect of bevacizumab periocular injection and intravitreal injection of retinopathy of premature rats.Methods Ninety preterm rat retinopathy models were randomly divided into 3 groups:high oxygen group,retrobalbar injection group,and vitreous cavity group (n =30 per group);36 healthy rats were chosen as the normal control group.Each group were randomly selected 10 rats 'right eyes to make retinal flat mount to observe the right eye retina vascular morphology;10 resections of right eyes were embedded in paraffin,and stained with hematoxylin eosin (HE);the number of right eye of retinal neovascularization was observed;the right eye RNA was extracted,and reverse-transcription polymerase chain reaction (RT-PCR) was used to detect the expression of VEGF.Results The normal group showed retinal vessels were around a reflection of distribution,good branch,shape rules,and clear structure.Intravitreous neovascularization occurred in the high oxygen group and peribulbar injection group.Retinal vascular endothelial cells in the high oxygen group were increased significantly compared to the normal group (P ＜ 0.05).The visible clusters of red blood cells in the periocular injection group and vitreous group were decreased compared to the high oxygen group (P ＜ 0.05),but no significant difference between the periocular injection group and vitreous group (P ＞ 0.05).The expressions of VEGF mRNA and HE staining had a consistent trend.Conclusions Bevacizumab inhibited the expression of VEGF that was increased in premature rats in hyperoxia retinopathy.The effects of bevacizumab periocular injection and intravitreal injection were similar,but the former was more secure than the latter.

Objective To discuss the therapeutic strategy and the clinical efficacy of percutaneous cholecystostomy in treating high-risk patients with acute cholecystitis. Methods During the period of Jan. 2006-June 2008,percutaneous cholecystostomy was performed in 27 high-risk patients with acute cholecystitis,consisting of lithic cholecystitis (n = 21) and non-lithic cholecystitis (n = 6). Of 27 patients,percutaneous cholecystostomy via transhepatic approach was performed in 22 and via transperitoneal approach in 5. The 7 F drainage catheter was used. Cholecystography was conducted before the drainage catheter was extracted. Results Percutaneous cholecystostomy was successfully accomplished in all 27 cases,with a technical success rate of 100%. Postoperative patency of gallbladder drainage was obtained in 25 patients,with the relieving or subsiding of abdominal pain and the restoring of temperature and leukocyte account to normal range within 72 hours. In one patient,as the abdominal pain relief was not obvious 72 hours after the procedure,cholecystography was employed and it revealed the obstruction of the drainage catheter. After reopening of the drainage catheter,the abdominal pain was relieved. In another case,cholecystography was carried out because the abdominal pain became worse after the procedure,and minor bile leak was demonstrated. After powerful anti-infective and symptomatic medication,the abdominal pain was alleviated. The drainage catheter was extracted in 25 patients 6-7 weeks after the treatment. Of these 25 patients,12 accepted selective cholecystectomy,7 received percutaneous cholecystolithotomy and 6 with non-lithic cholecystitis did not get any additional surgery. The remaining two patients were living with long-term retention of the indwelling drainage-catheter. Conclusion Percutaneous cholecystostomy is a simple,safe and effective treatment for acute cholecystitis in high-risk patients. This technique is of great value in clinical practice.