OBJECTIVETo analyze the stress and displacement distribution of 3D-FE models in three conjunctive methods of vascularized iliac bone graft for established mandibular body defects.

METHODSUsing computer image process technique, a series of spiral CT images were put into Ansys preprocess programe to establish three 3D-FE models of different conjunctions.

RESULTSThe three 3D-FE models of established mandibular body defects by vascularized iliac bone graft were built up. The distribution of Von Mises stress and displacement around mandibular segment, grafted ilium, plates and screws was obtained.

CONCLUSIONIt may be determined successfully that the optimal conjunctive shape be the on-lay conjunction.

Bone Transplantation ; Finite Element Analysis ; Humans ; Ilium ; Imaging, Three-Dimensional ; Mandible

OBJECTIVETo investigate the biomechanical force distribution of three different cleft maxillary finite-element models pre- and post-bone graft with specified load to certain area of the models.

METHODSDeveloping a cleft palate bony model from a 15-year cleft palate male CT scan DICOM data and generating alveolar bone-grafted, alveolopalatal bone-grafted cleft maxillary finite-element model was set up through gluing the graft model. Also the pre-grafted model as compared, vector lip force on the anterior and anteriolateral face of the alveolar ridge was applied, and studied the press distribution properties and localized area.

RESULTSThe press principal spread along the alveolar ridge and focused on anterior wall of maxillary prior to graft. But the press tended to be evenly distributed after bone grafted, whether alveolar or/and hard palate bone grafted. The grafted bone could resisted the medially deformation of alveolar crest and decreased the shear press to the nasal base bony structure. The map showed no significant differences along with alveolar or/and hard palate bone graft.

CONCLUSIONThe postoperative lip pressure plays an important role for the deformation and deviation of alveolar ridge. Alveolar bone graft could even the distribution of the stresses and should be emphasized. But the grafted bony palatal appears superior to but no significant mapping and anti-deformation difference with alveolar bone graft.

Alveolar Process ; Bone Transplantation ; Cleft Lip ; Cleft Palate ; Face ; Humans ; Male ; Maxilla ; Palate, Hard ; Tomography, X-Ray Computed

OBJECTIVETo study the effects of aloesin and arbutin on normal cultured human melanocytes in synergetic method.

METHODSBuilding up the system of cultured human melanocytes. The cultured melanocytes in vitro were treated with the mixture of aloesin and arbutin. The cell viability and tyrosinase activity was measured by MTT assay, utilization of L-Dopa as the substrate respectively; melanin content was measured by image analysis system. Furthermore, the effects of the mixture on melanocytes were compared with that of aloesin and arbutin.

RESULTSThe mixture of aloesin and arbutin showed an inhibition on tyrosinase activity of human melanocytes and reduced significantly melanin content. Between the mixture and the single use of aloesin or arbutin, there is significant difference (P < 0.05). On the other hand, the mixture has little influence on melanocytes viability and there is negative significance.

CONCLUSIONThe mixture of aloesin and arbutin can significantly inhibit the tyrosinase activity and melanogenesis of cultured human melanocytes. It showed the effects of aloesin and arbutin in a synergistic manner. It is worth to give farther study later.

Arbutin ; pharmacology ; Cells, Cultured ; Chromones ; pharmacology ; Dose-Response Relationship, Drug ; Drug Synergism ; Glucosides ; pharmacology ; Humans ; Melanocytes ; cytology ; drug effects ; metabolism ; Monophenol Monooxygenase ; drug effects ; metabolism

OBJECTIVETo compare the effect of Sodium Morrhuate on ECV-304 between its lipo- and normal preparation.

METHODSThe ECV-304 cell line was supplemented with Sodium Morrhuate and lipo-Sodium Morrhuate in order, and the result on morphology (microscope, Giemsa Staining and electron microscope), cell activity (MTT), and flow cytometer between the two preparation were compared.

RESULTSIn normal preparation group, cell's edema occurred. Chromatin was like catkins. Tumefaction and degeneration of mitochondrion and endoplasmic reticulum appeared. In lipo-Sodium Morrhuate group, the membrane was creased and processus appeared. Chromatin aggregates to the membrane of nucleus was like crescent, and then broken. The apoptotic body was formed. MTT changes showed that the curve of the normal preparation group was steep and the change time was short relatively, which cues the vital cells decreased sharply. The curve of lipo-Sodium Morrhuate group was gentle and the change time was long relatively, which cues the vital cells decreased slowly. The flow cytometer showed that typical apoptosis peak appeared.

CONCLUSIONThe normal preparation group shows an acute toxic effect on ECV-304 cell line, which result in a necrosis course, while lipo-Sodium Morrhuate shows a gradual releasing process, which may indicate a apoptosis course.

Animals ; Apoptosis ; Cell Line ; Humans ; Necrosis ; Sclerosing Solutions ; Sodium Morrhuate

Objective: To evaluate the impact of rehabilitation on exercise capacity, cardiopulmonary function and quality of life (QoL) in patients with chronic heart failure (CHF). Methods: A total of 96 CHF patients with NYHA Ⅱ-Ⅲ and left ventricular ejection fraction (LVEF)<40% were enrolled. Based on routine drug therapy, the patients were randomly assigned into 2 groups: Control group, n=50 and Rehabilitation group, n=46, the patients performed treadmill exercise, the training intensity was tailored by (50-80) % of peak oxygen uptake (peak VO2) of baseline cardiopulmonary exercise test (CPET) at (25-40) min/session, 3 sessions/week for 12 weeks. The peak VO2, VE/VCO2 slop, anaerobic threshold (VO2 AT), maximum workload and maximum exercise time were measured by CPET; left atrial diameter (LAD), left ventricular end diastolic diameter (LVEDD), cardiac index (CI) and LVEF were examined by echocardiography; 6 min walking distance (6MWD) and plasma NT-proBNP level were recorded; QoL was assessed by Minnesota living with heart failure questionnaire (MLWHFQ). The above indexes were compared within Rehabilitation group and between 2 groups. Results: In Rehabilitation group, compared to baseline condition, the following indexes were increased by 12 weeks training: peak VO2 (19.8±2.7) ml/min?kg vs (17.4±2.1) ml/min?kg, VO2 AT (11.6±2.5) ml/min?kg vs (9.5±1.8) ml/min?kg, maximum workload (120±20) w vs (102±21) w, maximum exercise time (8.2±1.7) min vs (6.4±1.5) min, CI (2.2±0.5) L/(min?m2) vs (1.9±0.4) L/(min?m2), LVEF (42±5) % vs (35±4) % and 6MWD (406±58) m vs (345±79) m, all P<0.05; while the following parameters were decreased: VE/VCO2 slop (31.7±4.6) vs (34.2±5.8), LAD (38.6±5.5) mm vs (41.5±3.6) mm, LVEDD (58.4±6.3) mm vs (62.9±5.4) mm, NT-proBNP (235±69) ng/ml vs (387±57) ng/ml and MLWHFQ (30.8±12.0) vs (42.3±8.5), all P<0.05. The above indexes were different between Control group and Rehabilitation group, all P<0.05. Conclusion: Rehabilitation may safely and effectively improve cardiopulmonary function and quality of life in CHF patients.

Objective To investigate the effects of Panax Notoginseng saponins (PNS) on protein expression of Klotho in rats with renal ischemia reperfusion injury; To discuss its protective mechanism for model rats. Methods Experimental rats were randomly divided into sham-operation group, model group, positive medicine group, PNS high-, medium- and low-dosage groups. Each administration group was given relevant medicine for gavage, once a day. Renal ischemia reperfusion injury model was established. Rats were sacrificed by taking blood from abdominal aorta after 4 hours of modeling. Serum levels of blood urea nitrogen (BUN), creatinine (SCr), malondialdehyde (MDA) content in kidney tissue, superoxide dismutase (SOD) activity and glutathione peroxidase (GSH-Px) activity were measured. HE staining was used to observe the morphological changes of renal tissue. The protein expressions of Klotho and NF-κB p65 were measured by immunohistochemical method. Results Compared with the sham-operation group, the levels of BUN and SCr in the model group increased significantly (P<0.05); protein expression of Klotho in renal tissue decreased and the protein expression of NF-κB p65 increased (P<0.05). Compared with the model group, the expression of Klotho increased but protein expression of NF-κB p65 decreased in each administration group (P<0.05); Compared with the positive medicine group, the expression of Klotho in PNS high-dosage group increased but protein expression of NF-κB p65 decreased (P<0.05). The protein expression of NF-κB p65 was negatively related to protein expression of Klotho (r=-0.895, P<0.05). Conclusion PNS can inhibit oxidative stress and anti-inflammatory effects through upregulating protein expression of Klotho, and reduce the protein expression of NF-κB p65, and thus exerts renal protective effects.

OBJECTIVETo find the reasons why patients always have temporomandibular disorders (TMD) after condylar fracture by analyzing the stress distribution change of the condylar surface whose subcondylar fracture ware fixed by miniplate during the whole healing process.

METHODSAnalyzing the stress distribution change of the condylar surface whose subcondylar fracture were fixed by miniplate during the whole healing process by three-dimension finite element method (3D FEM).

RESULTSDuring the whole healing process of the fracture, the miniplate osteosynthesis was helpful to the biomechanics environment rehabilitation of the condylar local, but it still had difference with normal after fixing 12 weeks long.

CONCLUSIONThe difference of stress distribution of condylar surface that fractured and fixed by miniplate with normal may be part of the reason of TMD after the subcondylar fracture miniplate osteosynthesis.

Adult ; Fracture Fixation, Internal ; Fracture Healing ; Humans ; Mandibular Condyle ; Mandibular Fractures

OBJECTIVEThe aim of this study was to observe the human hair follicle apoptosis status affected by fluorine and the antagonism effect by selenium in vitro.

METHODSThe single hair follicles were separated and cultured, then they were added in different concentrations of sodium fluoride and sodium selenite. Chosen the appropriate concentrations, they were divided into 7 groups. The TUNEL was used to investigate the apoptotic cells of different parts. The morphous of hair follicles was observed consecutively and electron microscope was used.

RESULTSWe found that in 1 mmol/L and 10 mmol/L sodium fluoride groups, when the human hair follicles in vitro were cultured on the 5th day, the apoptotic cells of outer root sheath (ORS), dermal sheath and hair papilla, hair bulb were obviously increased. But 0.01 mmol/L sodium selenite weakened the toxicity of 1 mmol/L sodium fluoride at the outer root sheath and hair bulb (P < 0.05).

CONCLUSIONSDifferent concentrations of sodium fluoride had different effect on the growth of human hair follicle in vitro which were cultured on 5th day. Sodium fluoride of certain concentration could accelerate the apoptosis of human hair follicle in vitro. Sodium selenite of certain concentration could act antagonism to the toxicity of sodium fluoride.

Adolescent ; Adult ; Apoptosis ; drug effects ; Hair Follicle ; drug effects ; Humans ; Middle Aged ; Sodium Fluoride ; pharmacology ; Sodium Selenite ; pharmacology ; Tissue Culture Techniques ; Young Adult

OBJECTIVETo observe the effects of NGF, estrogens and minoxidil on the growth of human hair follicle in vitro.

METHODSIn a model of human hair follicle in vitro, the follicle was separately treated with the NGF, estrogens and minoxidil. The growth of the hair follicle was measured in length with an eyepiece micrometer. The effects of the NGF, estrogens and minoxidil were evaluated by measuring the rates of incorporation of 3H-TdR of DNA synthesis.

RESULTSThe growth of the human hair follicle was showing significantly faster in the 100 ng/ml NGF and 125 micrograms/ml minoxidil groups, compared with the control (P < 0.05), but the growth was significantly inhibited in the 0.5 microgram/ml 17 beta-E2 group (P < 0.05). There was no difference shown for the growth of the hair follicle in the group mixed with 100 ng/ml NGF and 0.5 microgram/ml 17 beta-E2 (P > 0.05). The rates of incorporation of 3H-TdR in the groups were shown that the results just correlated with the results of the above-mentioned method.

CONCLUSIONSThe 100 ng/ml NGF and 125 micrograms/ml minoxidil could increase the growth of human hair follicle while the 0.5 microgram/ml 17 beta-E2 could inhibit it. The 100 ng/ml NGF could neutralized the effect of the 0.5 microgram/ml 17 beta-E2.

Adolescent ; Adult ; Estrogens ; pharmacology ; Hair Follicle ; cytology ; drug effects ; growth & development ; Humans ; In Vitro Techniques ; Middle Aged ; Minoxidil ; pharmacology ; Nerve Growth Factor ; pharmacology ; Vasodilator Agents ; pharmacology

OBJECTIVETo investigate the effects of cycloheximide and TNF-alpha on melanocyte (MC).

METHODSMelanocyte apoptosis was studied with MTT, transmitting electron microscopy and fluorescence labeling of alive cells.

RESULTSWe added TNF-alpha and cycloheximide in melanocytes, and the typical apoptosis appeared 24 hours later, with chromatin condensation, nuclear pyknosis and apoptotic bodies formation. The results of cytometry showed the typical apoptotic peak.

CONCLUSIONTNF-alpha and cycloheximide together could inhibit MC proliferation and induce MC apoptosis.

Adolescent ; Adult ; Apoptosis ; drug effects ; Cell Proliferation ; Cycloheximide ; pharmacology ; Drug Synergism ; Humans ; In Vitro Techniques ; Male ; Melanocytes ; cytology ; drug effects ; Middle Aged ; Tumor Necrosis Factor-alpha ; pharmacology ; Young Adult