Adult ; Aggressive Periodontitis ; diagnosis ; diagnostic imaging ; therapy ; Combined Modality Therapy ; Dental Scaling ; Female ; Humans ; Orthodontics, Corrective ; Radiography ; Tooth Loss ; diagnosis ; diagnostic imaging ; therapy

OBJECTIVETo investigate the changes in the expressions of p53, DKK (the inhibitor of Wnt pathway) and phosphorylated tau in rat bilateral hippocampus after beta-amyloid peptide (beta-AP) (25-35) injection, and observe the effect of saponin B from Anemarrhena asphodeloides Bunge (SAaB) in this model.

METHODSAfter bilateral injection of beta-AP (25-35) into the hippocampus of rats, RT-PCR was performed for observing the changes in p53 and DKK mRNA expressions and immunochemistry carried out to detect the changes in phosphorylated tau protein.

RESULTSRT-PCR showed increased p53 and DKK mRNA expression and immunochemistry revealed increased phosphorylated tau-positive cells in rat hippocampus after beta-AP (25-35) injection, and administration of SAaB significantly ameliorated these changes.

CONCLUSIONSAaB can significantly ameliorate beta-AP-induced tau hyperphosphorylation by inhibiting increased p53 and DKK mRNA expressions in response to beta-AP injection.

Amyloid beta-Peptides ; pharmacology ; Anemarrhena ; chemistry ; Animals ; Hippocampus ; drug effects ; metabolism ; Immunohistochemistry ; Intercellular Signaling Peptides and Proteins ; biosynthesis ; genetics ; Male ; Peptide Fragments ; biosynthesis ; genetics ; pharmacology ; Phosphorylation ; drug effects ; RNA, Messenger ; biosynthesis ; genetics ; Random Allocation ; Rats ; Rats, Sprague-Dawley ; Reverse Transcriptase Polymerase Chain Reaction ; Saponins ; pharmacology ; Tumor Suppressor Protein p53 ; biosynthesis ; genetics ; tau Proteins ; metabolism

OBJECTIVETo evaluate the effect of wound closure tension on the blood flow of the expanded pedicled fasciocutaneous flap, so as to find the best tension for the blood supply of the flap.

METHODS8 piglets, aged 9-12 months, were used. On each side of pig back, a cephalic based expanded fasciocutaneous flap was designed. The size of the flaps was 5 cm x 20 cm. In the control group, the flaps were not elevated (0 g tension). In the experimental group, the flaps were treated at the end with the tension of 100, 200, 300, 400, 500, 600, 700, 800, and 900 g after elevation. The blood oxygen saturation (StO2) of the flaps was measured under different wound closure tension.

RESULTSThe flap StO2 raised along the increase of tension until the tension reached 200-300 g. Then the flap StO2 decreased when the tension continued to increase above 200-300 g.

CONCLUSIONSThe tension of 200-300 g is good for the blood flow of expanded pedicled fasciocutaneous flap. So the flap flexibility can be best used and the complication can be avoided.

Animals ; Surgical Flaps ; blood supply ; Sus scrofa ; Swine ; Tensile Strength

OBJECTIVETo evaluate the beneficial effects of application of a self-designed reciprocating gait orthosis (RGO) combined with comprehensive rehabilitation training on bladder and bowel function in paraplegic patients sustaining spinal cord injuries (SCI).

METHODSTwelve paraplegic patients with complete spinal cord injury at the levels between T(4) and L(1) received the RGO with a comprehensive rehabilitation exercise program carried out before and after fixing. Cold water and colon excretion tests were performed before and 3 months after application of the RGO, and the bladder volume, residue bladder volume, and bladder and bowel pressures were measured in these patients.

RESULTSThe 12 paraplegic patients all showed positive results in cold water test before and after RGO application. Before RGO application, 11 of these patients were positive for urine bacteria and only 1 patient was still positive 3 months after the application. The bladder volume and bowel pressure of the patients were significantly increased (P<0.05), while the residue volume and pressure of the bladder were significantly reduced 3 months after RGO application (P<0.05).

CONCLUSIONRGO combined with comprehensive rehabilitation training can effectively improve the bladder and bowel function and the quality of life of patients with complete spinal cord injury, suggesting much clinical value for its extensive application.

Adult ; Female ; Humans ; Intestines ; physiopathology ; Male ; Middle Aged ; Orthotic Devices ; Paraplegia ; etiology ; physiopathology ; rehabilitation ; Spinal Cord Injuries ; complications ; Urinary Bladder ; physiopathology ; Walkers ; Young Adult

Adult ; Female ; Humans ; Lymphoma, Non-Hodgkin ; diagnosis ; pathology ; Tracheal Neoplasms ; diagnosis ; pathology

Objective: To compare the efficacies of two training protocols, i.e. the multimedia instruction and the conventional method, in periodontal surgery teaching for undergraduate students. Methods: One hundred and twenty-three dental undergraduates in their pre-clinical training course were recruited and divided into two groups according to the learning grade matching principle: the experimental group (multimedia instruction, 60 students) and the control group (conventional method, 63 students). The teaching aim was to train the students gingivectomy and periodontal flap surgery by using the pig jaws. The conventional teaching method of teacher-demonstrating and student-practicing was used in the control group, and the practice time of the students′ for each surgery was 45 minutes. A standardized teaching video combined with the teachers′ explanations of the key steps was used in the experimental group. The students′ practice time for each surgery was 60 minutes. The efficacy of teaching protocol was evaluated by the teachers according to the scoring criteria set by the teaching group. Results: In gingivectomy training, accuracy of fixed points, angle of postoperative gingival margin and morphology of gingiva of the experimental group were better than those of the control group. The experimental group also had more complete and continuous excised gingivae and more thorough adjacent gingival removal. The total scores of the experimental group were significantly higher than those of the control group (92.8±2.6 vs. 89.9±3.7, P<0.05). In periodontal flap surgery training, the experimental group operated the blade around the shape of the tooth better in internal bevel incision than the control group. Additionally, the incision position of internal bevel incision, periosteal integrity after flapping and flap depth of the experimental group were better than those of the control group. Besides, the experimental group had smoother flap edge and more thorough debridement. The total scores of the experimental group were significantly higher than those of the control group (92.2±4.1 vs. 89.2±4.4, P<0.05). Conclusions The teaching efficacy of multimedia instruction was better than that of the conventional method. Its value needs to be further tested in future teaching practice.

Objective To introduce the technique of interictal 18F-fluorodeoxyglucose positron emission tomography (18F-FDG-PET) examination and explore the value of 18F-FDG-PET in the localization of epileptogenic focus of temporal lobe epilepsy (TLE) confirmed by surgical result.Methods Clinical data were retrospectively analyzed in 82 TLE patients having received interictal 18F-FDG-PET preoperative evaluation and got EngleⅠ grade epileptic surgical outcome, and the sensitivity and specialty of interictal 18F-FDG-PET were compared with those of MRI and scalp video-EEG. Results Epileptogenic foci showed hypometabolism on 18F-FDG-PET, and the hypometabolism zones were localized in ipsilateral temporal lobe in 68 cases,beyond ipsilateral temporal lobe in 9 cases; the other 5 had no hypometabolism zone. Accuracy rate of localization of epileptogenic foci by interictal 18F-FDG-PET was 82.9% (68/82), significantly higher than that by MRI or EEG(P＜0.05).77.4%(41/53)epileptogenic foci where MRI showed negative and 75%(15/20)where EEG with imbedded electrode was applied were precisely localized by 18F-FDG-PET. The accuracy was higher in the cases with positive pathological result than in the ones with negative result. Conclusions Interictal 18F-FDG-PET possesses excellent sensitivity and specialty in preopemtive assessment for TLE, and is of good value in the localization of epileptogenic focus where MRI shows negative or invasive electrophysiologic monitoring is needed.Rational application may raise the accuracy rate.

OBJECTIVETo observe the distribution of neuronal nitric oxide synthase (nNOS)-immunopositive neurons in rat corpus striatum and their ultrastructural features.

METHODSBrain tissue specimens were obtained from normal SD rats, in which nNOS-immunopositive neurons were visualized by ABC immunocytochemistry and observed under immunoelectron microscope with pre-embedding staining.

RESULTSUnder light microscope, nNOS-immunopositive neurons appeared brown with distinct profiles of the cell body and processes. These neurons, mostly medium-sized and small cells, were located mainly in the lateral region of the corpus striatum. Only a few immunopositive neurons were detected in the medial region of the corpus striatum. Immunohistochemistry and transmission electron microscopy identified the nNOS-immunopositive neurons as interneurons possessing large nuclei with small amount of cytoplasma. The immunopositive granules were visualized as black plaques, and the larger ones distributed mainly in the cell bodies, some with monolayer membrane encapsulation. The small granules did not have the encapsulation, scattering in perinuclear regions and under the cell membrane, but not in the cell body. The immunopositive granules were also found in the axons and dendrites, but not in the vesicles of the synapses. In addition, many immunopositive terminals were found close to the blood vessels.

CONCLUSIONSnNOS-immunopositive neurons in rat corpus striatum are mainly medium-sized and small cells as is typical of the interneurons. The immunopositive granules locate in the cytoplasma, axons and dendrites, and larger granules have membrane coating while small ones do not, possibly in relation to their functions.

Animals ; Corpus Striatum ; enzymology ; ultrastructure ; Immunohistochemistry ; Male ; Microscopy, Electron, Transmission ; Neurons ; enzymology ; ultrastructure ; Nitric Oxide Synthase Type I ; metabolism ; Rats ; Rats, Sprague-Dawley

Objective To build a 2D/3D registration system based on the compute unified device architecture(CUDA) frame with single X-ray image and CT data of knee joints and apply it in the research of knee motion and stability of implanted prosthesis. Method The digital radiography(DR) equipment used in the study was calibrated by the Zhang zhengyou Calibration Method, and then digitally rendered radiographs(DRR) images were generated in the CUDA frame with light tracing algorithm, and the best 2D/3D registration parameters were calculated with a similarity operator of cross correlation; finally, the results were evaluated by using the method of 3D/3D registration with data obtained from a 3D laser scanner. Results With knee specimen X-ray images and CT data, in 6 degrees of freedom, the average errors of transform were below 1 mm, and those of rotation were below 1°. Conclusions The 2D/3D registration system can meet the precision requirement of motion detection and be used to study the knee motion and prosthesis location.

Objective:To analyze the incidence and epidemiological characteristics of traumatic spinal cord injury in China in 2018.Methods:Multi-stage stratified cluster sampling was used to randomly select hospitals capable of treating patients with spinal cord injury from 3 regions，9 provinces and 27 cities in China to retrospectively investigate eligible patients with traumatic spinal cord injury admitted in 2018. National and regional incidence rates were calculated. The data of cause of injury，injury level，severity of injury，segment and type of fracture，complications，death and other data were collected by medical record questionnaire，and analyzed according to geographical region，age and gender.Results:Medical records of 4，134 patients were included in this study，with a male-to-female ratio of 2.99∶1. The incidence of traumatic spinal cord injury in China in 2018 was 50.484 / 1 million （95% CI 50.122-50.846）. The highest incidence in the Eastern region was 53.791 / 1 million （95% CI 53.217-54.365）. In the whole country，the main causes of injury were high falls （29.58%），as well as in the Western region （40.68%），while the main causes of injury in the Eastern and Central regions were traffic injuries （31.22%，30.10%）. The main injury level was cervical spinal cord in the whole country （64.49%），and the proportion of cervical spinal cord injury in the Central region was the highest （74.68%），and the proportion of lumbosacral spinal cord injury in the Western region was the highest （32.30%）. The highest proportion of degree of injury was incomplete quadriplegia （55.20%），and the distribution pattern was the same in each region. A total of 65.87% of the patients were complicated with fracture or dislocation，77.95% in the Western region and only 54.77% in the Central region. In the whole country，the head was the main combined injury （37.87%），as well as in the Eastern and Central regions，while the proportion of chest combined injury in the Western region was the highest （38.57%）. A total of 32.90% of the patients were complicated with respiratory complications. There were 23 patients （0.56%） died in hospital，of which 17（73.91%） died of respiratory dysfunction. Conclusions:The Eastern region of China has a high incidence of traumatic spinal cord injury. Other epidemiological features include high fall as the main cause of injury cervical spinal cord injury as the main injury level，incomplete quadriplegia as the main degree of injury，head as the main combined injury，and respiratory complications as the main complication.