CT portal vein imaging combined with liver function indexes to predict the risk of bleeding from gastric fundus esophageal varices in liver cirrhosis / 中国医师进修杂志

Objective:To explore the value of CT portal vein imaging combined with liver function indexes in predicting the risk of esophageal variceal bleeding in patients with liver cirrhosis.Methods:A total of 82 patients with liver cirrhosis complicated with gastric fundus esophageal varices in Wanbei Coal-Electricity Group General Hospital were selected and divided into bleeding group (24 cases) and non-bleeding group (58 cases) according to the occurrence of gastric fundus esophageal varices bleeding within 6 weeks after admission. General data of the two groups, CT portal vein imaging parameters at admission including diameter of main portal vein (MPV), diameter of splenic vein (SPV), diameter of left gastric vein (LGV), serum liver function indexes including alanine aminotransferase (ALT), aspartate aminotransferase (AST), total bilirubin (TBIL) levels were compared between the two groups, and analyzed the value of CT portal vein imaging parameters and serum liver function indexes levels in predicting the risk of gastric fundus esophageal varices bleeding.Results:The age and diameter of MPV, SPV, LGV in bleeding group were higher than those in the non-bleeding group: (55.17 ± 12.02) years vs. (53.71 ± 10.48) years, (18.05 ± 2.74) mm vs. (15.22 ± 2.18) mm, (13.68 ± 1.35) mm vs. (12.26 ± 1.43) mm, (6.82 ± 1.38) mm vs. (5.30 ± 0.94) mm; the levels of serum ALT, AST, TBIL in bleeding group were lower than those in the non-bleeding group: (23.71 ± 5.74) U/L vs. (34.95 ± 8.26) U/L, (27.65 ± 6.61) U/L vs. (39.29 ± 10.24) U/L, (17.20 ± 5.49) U/L vs. (26.13 ± 7.85) U/L, there were statistical differences ( P<0.05). The results of receiver operating characteristic curve showed that the area under the curve (AUC) of combined index to predict gastric fundus esophageal varices bleeding was 0.889 (95% CI 0.812-0.967), and the sensitivity and specificity were 83.34% and 81.03%, respectively. Conclusions:CT portal vein imaging combined with liver function indexes has a good value in predicting the risk of gastric fundus esophageal varices bleeding in liver cirrhosis.

Correlation analysis between enhanced CT quantitative parameters and malignant biological behavior and prognosis of colon cancer / 中国医师进修杂志

Objective:To explore the correlation between enhanced CT quantitative parameters and malignant biological behavior and prognosis of colon cancer.Methods:From February 2017 to October 2019, 100 patients with colon cancer in Anhui Wanbei Coal-Electrivity Group Gernal Hospital were selected as the research subjects, and all performed enhanced CT examination. The serum tumor markers carcinoembryonic antigen (CEA), carbohydrate antigen 19-9 (CA19-9) levels were detected. According the mean value of CEA, CA19-9, the patients were divided into different group, and CEA< 28.36 pmol/L was considered to below level, ≥ 28.36 pmol/L was high; CA19-9<40.26 pmol/L was considered to below level, ≥ 40.26 pmol/L was high. The quantitative parameters of enhanced CT in patients with colon cancer with different serum CEA and CA19-9 levels and different pathological indicators (CT scan value, enhanced value, degree of enhancement) were compared. The correlation between serum tumor marker levels, malignant biological behavior of colon cancer and quantitative parameters of enhanced CT were explored. After 12-months′ followed-up, the clinical data of patients with different prognosis and enhanced CT parameters were counted. The factors affecting the prognosis of colon cancer patients and the predictive value of enhanced CT quantitative parameters on the prognosis of patients were explored.Results:The CT scan value, enhancement value and enhancement degree of colon cancer patients with low levels of serum CEA and CA19-9 were lower than those with high levels: (30.16 ± 5.14) HU vs. (38.51 ± 5.72) HU, (55.74 ± 8.12)HU vs. (78.62 ± 8.97) HU, (25.58 ± 3.60) HU vs. (40.11 ± 3.14) HU, the differences were statistically significant ( P<0.05). There was a positive correlation between serum CEA and CA19-9 levels in patients with colon cancer and CT scan value, enhancement value, and degree of enhancement ( P<0.05). The CT enhancement value and enhancement degree of colon cancer patients were related to Dukes staging, differentiation degree, lymph node metastasis and lymphatic infiltration in colon cancer patients. The CT scan value was related to Dukes staging, lymph node metastasis and lymphatic infiltration of colon cancer patients ( P<0.05). The risk factors for death of colon cancer patients included age, Dukes staging, degree of differentiation, lymph node metastasis, lymphatic invasion, CT scan value, enhancement value, and degree of enhancement ( P<0.05). The area under the curve (AUC) of CT scan value, enhancement value, and enhancement degree combined to predict the prognosis of colon cancer patients was 0.873, which was greater than the single prediction of each parameter. The best sensitivity and specificity of combined prediction were 76.92% and 88.37%, respectively. Conclusions:There is a certain correlation between the enhanced CT quantitative parameters and the malignant biological behavior of patients with colon cancer. The increased detection value is risk factor for the prognosis.

Occluding effect of two kinds of Er laser on dentinal tubules:An in vitro study / 实用口腔医学杂志

Objective:To evaluate the occluding effect of 2 kinds of Er laser on dentinal tubules.Methods:27 dentine discs were prepared,etched with 0.5 mol/L EDTA and then divided into 3 groups(n =9).The samples in group A without treatment were used as the controls,in group B treated with Er:YAG laser irradiation and in group C treated with Er,Cr:YSGG laser irradiation.The occluding effect was examined by scanning electron microscopy (SEM).Results:Micrographs of SEMshowed obvious occluding effect in group B and C.The dentinal tubule exposure rates of group A,B and C were 33.61 0% ±7.545%,4.1 86% ±0.723% and 3.798% ± 0.843% respectively(among 3 groups,P 0.05).Conclusion:The 2 kinds of Er laser can block dentinal tu-bules.

Effects of two endodontic sealers on the bond strength of two fiber posts / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the effects of two different endodontic sealers on the bond strength of two fiber posts cemented with adhesive resin cement.</p><p><b>METHODS</b>Twenty-eight crownless human maxillary central incisors were prepared with the step-back technique and randomly divided into four groups according endodontic sealer and fiber: Group A, Cortisomol sealer+Matchpost fiber post; Group B, Cortisomol sealer+Macrolock fiber post; Group C, Guttaflow sealer+Matchpost fiber post; Group D, Guttaflow sealer+Macrolock fiber post. One week after fiber posts were bonded, a thin-slice push-out test was performed in a universal machine. Morphologic structure of the root canal dentin surfaces etched and the adhesive interfaces were examined by scanning electron microscopy (SEM).</p><p><b>RESULTS</b>The bond strengths of 4 groups were (7.06 +/- 3.22), (9.31 +/- 3.61), (6.90 +/- 3.13), (9.71 +/- 3.42) MPa. The bond strengths of group B and D were significantly higher than that of group A and C (P < 0.05). There was no significant difference between group A and C, group B and D (P > 0.05). The cervical third had the highest mean push-out bond strength, next to middle third and apical third (P < 0.01). SEM showed that larger numbers of the dentin tubules were open after the root canals were etched and penetration of resin tags into the dentinal tubules increased in the coronal root region when compared with the apical root region.</p><p><b>CONCLUSION</b>The shear bond strength doesn't have relationship with endodontic sealers. The serration significantly increases the retention of fiber post. The bond strengths are different at the three root segment sites.</p>

In vitro study on fracture resistance of teeth restored with direct and indirect composite resin / 实用口腔医学杂志

0.05).Significant difference was found between group ④ and ①,②,③ or ⑤(P

Mechanical test and two variable regression analysis of cavity design / 实用口腔医学杂志

Objective: To study the relationship between the depth and width of cavity design and to analyze the tendency of breaking load in preparations. Methods:Plaster models of mandibular first molar were prepared and magnified by 150%. Cavity on occlusal surface was designed and prepared in a cylinder shape with the depth(mm) of 3.0,4.5 and 6.0,and diameter(mm) of 3.0,4.5 and 6.0,respectively. 8 cavity samples were prepared for each design. The breaking load of the tooth models before and after restoration with self-curing resin was measured by Instron tester.Mechanical model static load test and two variable regression analysis were applied to study the mechanical property of the cavity design. Results:Before restoration, with the increase of depth and diameter, the incidence rate of tooth fracture increased. The width was the main factor. After restoration, the load was undertaken by restoration directly, and could be transfered to tooth and periodontal tissue through restoration uniformly. When the diameter of the cavity increased, the diameter of restoration also increased, and thus decreased the load on local structure of the tooth. With two-regression analysis, the regression equation and regression curve were obtained. Conclusion: The fracture of tooth before and after restoration is related to the diameter and depth of cavity design in cylinder shape. The regression equations of changing tendency of breaking load (Y) in preparation caused by the change of depth(X 1) and diameter(X 2) of cavity obtained by two-regression analysis are presented as follows: Before restoration: Y=1593.317-51.178 X 1-79.489X 2.After restoration:Y=1802.928 -192.461X 1+225.128X 2.

The design of software system of pulse oximeter / 中国医学物理学杂志

A software system of the pulse oximeter is presented in this paper. Based on Franklin C, this software system includes three main parts, one part is to automatically regulates the base line of signal, the second part is a controlled integral module,and the third part is a digital signal processing module. As the result, the pulse oximeter is satisfactory to clinical monitoring.

Study on bonding interface and microstructure of different resin composite inlays / 实用口腔医学杂志

Objective:To evaluate the characteristics of bonding interface and microstructure of different resin composite inlays. Methods:Different composite resins and adhesives were used for restoration of extracted molars, the results were evaluated under scanning electron microscope(SEM) and atomic force microscope(AFM).Results:The microstructure feature of Tescera was with higher density when compared with that of other conventional resins,and fewer small holes could be seen in Tescera. AFM pictures showed that Tescera was with a very smooth surface. Indirect composite resin could be combined with resin bonding agent tightly and infiltrated each other. The interface between direct resin inlay material and resin bonding agent was very clear,and no obvious interfiltration could be seen under SEM and AFM. Conclusion:After treatment with water, heat,light and pressure, the physical properties of indirect composite resin is improved effectively, and obvious infiltration can be found in the interface.

Tooth fracture resistance study after composite resin inlay by three dimensional finite element analysis / 实用口腔医学杂志

Objective: To evaluate fracture resistance of teeth restored with inlay restorations of direct and indirect composite resin. Methods:Three dimensional finite element analysis (3D FEA) was used in present research. Two types of load were applied to investigate the change of tooth fracture resistance after restored with MOD inlay. Group 1,2,3,and 4 were restored with four kinds of materials:group 1,indirect composite resin inlay( Tescera, Bisco USA);group 2, direct composite inlay(Renew Bisco USA);group 3,ceramic; and group 4, Co-Cr alloy. Defect tooth or intact one was served as the control group. Results:Tooth fracture resistance in group 1,2,3 and 4 were improved, Fracture resistance in group 1 and 2 were similar to intact tooth group, while the fracture resistance in group 3 and 4 was different effect when compared to intact tooth. Conclusion: Both direct and indirect composite resin inlay could strengthen fracture resistance of restored teeth. No obvious difference between direct and indirect composite resin on tooth resistance was found.

Micromorphology analysis of bonding interface between material and dentin after root canal rehabilitation / 实用口腔医学杂志

Objective:To observe the microstructure of interface between material and dentin after root canal rehabilitation. Methods:Three human maxillary incisors extracted within one week were used. After crowns being removed and received root canal treatment, they were used for the study. The root was split into two parts along the long axis, then the bonding interface was made with high speed diamond bur. Bis-Core and Chemil Superior glass-ionomer were stacked on root canal inner wall respectively and the teeth were split along with the long axis with Isomet saw, in order to expose bonding interface. The microstructure of bonding interface of the samples were analyzed by optical microscope and atomic force microscope(AFM). Results: AFM observation of the adhesive interface specimens showed that Chemil Superior glass-ionomer and teeth knitted together completely and no filling invaded into dentin tube. While the bonding interface between Bis-Core and dentin, dentin primer infiltrated into dentin tube and matrix around through the smear layer and colophony protruded. Conclusion:The observations reveal the extent of resin penetration into the dentinal tubules provides a very strong bonding. This is a fundamental cause of resin better bond to tooth.

Microtensile bonding strength between root canal wall and root canal rehabilitation materials / 实用口腔医学杂志

Objective:To test the microtensile bonding strength between root canal wall and Bis-Core, and that between root canal wall and Chemil Superior glass-ionomer.Methods:10 human maxillary incisors extracted within one week were kept for another one week after root canal treatment and removeal of the crowns,each root was splited into two parts along with the long axis by Isomet saw, the bonding interface on one third of upside of root dentin smear layer was made with Diamond bur at a high-speed. Then Bis-Core and Chemil Superior glass-ionomer were put on root canal inner surface of each half part of the root respectively, samples with the size of 1.00 mm?1.00 mm were prepared by Isomet saw. Two samples in which bonding interface was perpendiculur to load were selected and fixed in Microtensile testing machine for bonding strength test. Results:Microtensile bonding strength(MPa) between Bis-Core and root canal inner wall and that between root canal inner wall and Chemil Superior glass-ionomer was 20.65?1.72 and 12.89?1.63 respectively(P

Heatstroke prediction machine for single soldier / 医疗卫生装备

The heatstroke prediction machine for single soldier is used to monitor body temperature.It can connect with three temperature sensors and transform the temperature of three spots on body surface into electric potential which is linear compensated,magnified and then samplinged by the singlechip.The liquid crystal display shows the temperature of three spots on body surface and the corresponding temperature of anus in turn.With the function of bady temperature alarm and alarm initialization,it becomes a new equipment to monitor body state of the single solider in tropic war zone.