Objective To investigate whether damaged human amniotic epithelial cells(HAEC)could be repaired on the matrix of formulated fibrin clot in vitro and the effects of epidermal growth factor(EGF),basic fibroblast growth factor(bFGF)and transforming growth factor ?_1(TGF-?_1)on the proliferation of HAEC. Methods Ring drill was used to drill the HAEC layer on culture sheets to make quantified models of damaged HAEC, on which the lacks were then covered with fibrin clot. Subsequently, EGF (EGF group), bFGF(bFGF group) and TGF-?_1 (TGF-?_1 group) of different concentration were added into the sheets respectively. After the predesigned culturing time, the growing and transiting conditions of HAEC were observed under inverted microscope after Giemsa stain. Also, the proliferating conditions of HAEC were detected by using 5-bromodeoxyuridine(BrdU). Results In all groups, HAEC could transit toward damaged area on fibrin clot and grow there. Higher transiting speed and larger cell numbers were observed in the EGF and bFGF groups followed by the control group, while the TGF-?_1 group showed the relatively poorer results. Proliferating rates of HAEC were 17.8%, 28.0%, 35.3%, 51.6%, 34.1%, 34.2% and 26.0% respectively by EGF of different cultured concentration (1.0ng/ml, 5.0ng/ml, 10.0ng/ml, 20.0ng/ml, 40.0ng/ml, 80.0ng/ml and 160.0ng/ml). Proliferating rates of HAEC were 18.0%, 35.7%, 43.0%, 52.7%, 67.4%, 43.6% and 30.5% respectively by bFGF of different cultured concentration (1.0ng/ml, 5.0ng/ml, 10.0ng/ml, 20.0 ng/ml, 40.0 ng/ml, 80.0 ng/ml and 160.0ng/ml). Compared with the control group, EGF groups (EGF concentration ranging from 10ng/ml to 80ng/ml) and bFGF groups (bFGF concentration ranging from 5ng/ml to 80ng/ml ) showed better proliferating effects of HAEC(P

BACKGROUND:Lingual movable wing is a new type of lingual orthodontic technique and the different stretching lengths of the wring affect the torque control effect of anterior teeth.However,there is yet no related biomechanical research. OBJECTIVE:To investigate the displacement trend of dentition during adduction of mandibular anterior teeth and the effect of different wing stretching lengths on the biomechanical effect of mandibular anterior teeth. METHODS:The data of the mandible and lower dentition were collected by cone-beam CT and reconstructed using Mimics software to establish a three-dimensional finite element model of mandibular anterior teeth adducted by the lingual movable wing.The ANSYS software was used to analyze the initial displacement of the mandibular anterior teeth under the following conditions:A,2 mm stretching length;B,2.5 mm stretching length;C,3 mm stretching length;and D,3.5 mm stretching length. RESULTS AND CONCLUSION:The trend of initial displacement of lower dentition:The central incisors moved lingually with depression,the lateral incisors and canines moved mildly lingually with mesial lingual torsion,the second premolar was tilted distally with a marked lingual inclination and the first molar showed an overall mesial inclination with mesial crown eversion.Therefore,in the adduction cases of mandibular tooth extraction,attention should be paid to the lingual movement of the second premolar,which could be offset by corresponding techniques in clinic.The trend of anterior tooth displacement in all directions:from condition A to condition D,in the sagittal direction,the difference value in crown-root displacement of central incisors changed from-11.891 μm to-5.757 4 μm,indicating that the central incisor changes from oblique movement to overall movement.The difference value in crown-root displacement of lateral incisors changed from-11.828 1 μm to-6.711 45 μm,and that of canines changed from-7.572 3 μm to-4.695 5 μm,indicating that the oblique movement of the lateral incisors and canines is also changing to an overall movement.In the vertical direction,from condition A to condition D,the reduction of incisors was gradually increased,while that of canines was gradually decreased.These findings indicate that the stretching length of the wing can affect the oblique movement trend of the anterior teeth.As the wing continues to stretch,the torque control of the lower anterior teeth will become better.

The purpose of this study was to design and prepare a biocompatible microemulsion of Andrographis paniculata (BMAP) containing both fat-soluble and water-soluble constituents. We determined the contents of active constituents of BMAP and evaluated its bioavailability. The biocompatible microemulsion (BM), containing lecithin and bile salts, was optimized in the present study, showing a good physical stability. The mean droplet size was 19.12 nm, and the average polydispersity index (PDI) was 0.153. The contents of andrographolide and dehydroandrographolide in BMAP, as determined by high performance liquid chromatography (HPLC), were higher than that in ethanol extraction. The pharmacokinetic results of BMAP showed that the AUC0-7 and AUC0→∞ values of BMAP were 2.267 and 27.156 μg·mL(-1)·h(-1), respectively, and were about 1.41-fold and 6.30-fold greater than that of ethanol extraction, respectively. These results demonstrated that the bioavailability of and rographolide extracted by BMAP was significantly higher than that extracted by ethanol. In conclusion, the BMAP preparation displayed ann improved dose form for future clinical applications.
Andrographis ; chemistry ; Chemical Fractionation ; instrumentation ; methods ; Chromatography, High Pressure Liquid ; Diterpenes ; analysis ; isolation & purification ; Drugs, Chinese Herbal ; analysis ; isolation & purification ; Emulsions ; chemistry