Objective To investigate the incidence rate,clinical characteristics,and prognosis of neonatal stroke in Shenzhen,China.Methods Led by Shenzhen Children's Hospital,the Shenzhen Neonatal Data Collaboration Network organized 21 institutions to collect 36 cases of neonatal stroke from January 2020 to December 2022.The incidence,clinical characteristics,treatment,and prognosis of neonatal stroke in Shenzhen were analyzed.Results The incidence rate of neonatal stroke in 21 hospitals from 2020 to 2022 was 1/15 137,1/6 060,and 1/7 704,respectively.Ischemic stroke accounted for 75％(27/36);boys accounted for 64％(23/36).Among the 36 neonates,31(86％)had disease onset within 3 days after birth,and 19(53％)had convulsion as the initial presentation.Cerebral MRI showed that 22 neonates(61％)had left cerebral infarction and 13(36％)had basal ganglia infarction.Magnetic resonance angiography was performed for 12 neonates,among whom 9(75％)had involvement of the middle cerebral artery.Electroencephalography was performed for 29 neonates,with sharp waves in 21 neonates(72％)and seizures in 10 neonates(34％).Symptomatic/supportive treatment varied across different hospitals.Neonatal Behavioral Neurological Assessment was performed for 12 neonates(33％,12/36),with a mean score of(32±4)points.The prognosis of 27 neonates was followed up to around 12 months of age,with 44％(12/27)of the neonates having a good prognosis.Conclusions Ischemic stroke is the main type of neonatal stroke,often with convulsions as the initial presentation,involvement of the middle cerebral artery,sharp waves on electroencephalography,and a relatively low neurodevelopment score.Symptomatic/supportive treatment is the main treatment method,and some neonates tend to have a poor prognosis.

The stomatognathic system is an organic combination of bone, dentition, joints, masticatory muscles and innervation nerves. It is an organ system for the human body to perform mastication, speech, swallowing and other important functions. Due to the complex anatomical structure of stomatognathic system and ethical limitations, it is difficult to directly measure the movement and force by using the biomechanical experimental methods. Multi-body system dynamics is an important tool to study the kinetics and force of a multi-body system, which consists of several objects with relative motion. We can use the method of multi-body system dynamics simulation in engineering to study the movement, soft tissue deformation and force transfer of this complex stomatognathic system. This paper briefly introduces the history and application methods of multi-body system dynamics and the commonly used modeling methods. The application and research progress of multi-body system dynamics modeling methods in the field of stomatology was emphatically summarized, development prospects of current research and difficulties were put forward.

About 8 dental schools were founded by Chinese dentists during modern times (1909-1949) in China. Only one still worked after the founding of the People's Republic of China, which was one of the three dental schools founded by dentist Situ Bo. There were no systematic researches on Situ Bo's participation in dentistry education. This paper analyzes the founder's experience in dentistry and in the two schools he founded at the beginning, focusing on the background and process of the schools' construction, management, teaching, teachers and students training, etc. The results show that the establishment of the first two dental schools have laid important foundation for the establishment and development of Shanghai Dental College by the reserve of trained professional teachers and accumulated valuable experience in running schools. The systematic review of this history will help us better understand the establishment and development of Shanghai Dental College and the efforts in dentistry education made by dentists growed up in modern China, as well as the early development process of stomatology.

OBJECTIVE: To explore the clinical effect of Kirschner wire retractor-assisted reduction and inverted insertion of elastic nail in the treatment of children's irreducible subradial 1/3 fractures. METHODS: A total of 34 children with irreducible subradial 1/3 fractures treated by surgery from August 2016 to December 2020 were retrospective analyzed. Among them, 16 cases underwent Kirschner wire retractor-assisted closed reduction and percutaneous elastic intramedullary nailing with inverted insertion(observation group), 10 males and 6 females, aged from 4 to 10 years old with an average of(6.0±0.4)years;18 cases underwent open reduction and plate internal fixation (control group), 11 males and 7 females, the age from 3 to 10 years with an average of(7.0±0.5) years. The operation time, intraoperative blood loss, hospital stay, incision length, fracture healing time and complications of the two groups were observed and the wrist function was evaluated by Cooney wrist joint score. RESULTS: All patients were followed up for 3-12 years old with an average of (11.40±0.48) months in the observation group and 4-13 months with an average of (11.50±0.39) months in the control group. Bone healing was achieved in all patients, and there was no incision infection in both groups. The operation time, intraoperative blood loss, hospital stay and incision length in observation groups were lower than those of control group (P<0.05). There was no significant difference in the fracture healing time between two groups(P>0.05). There was no significant difference in postoperative healing and recovery of wrist function between groups(P>0.05). CONCLUSION Compared with open reduction and plate internal fixation, Kirschner wire retractor-assisted reduction and percutaneous elastic intramedullary nail fixation for irreducible subradial radial 1/3 fractures has the advantages of less trauma, shorter operation time, less blood loss, and satisfactory short-term clinical results.
Blood Loss, Surgical ; Bone Nails ; Bone Wires ; Child ; Child, Preschool ; Female ; Fracture Fixation, Internal/methods* ; Fracture Fixation, Intramedullary/methods* ; Fracture Healing ; Humans ; Male ; Radius Fractures/surgery* ; Retrospective Studies ; Treatment Outcome

Objective: To measure and analyze parameters of the three-dimensional (3D) model of the condylar movement envelope surface (ES) and provide a reference for the design of the temporomandibular prosthesis. Methods: Thirty-four healthy adults aged (25.4±2.8) years were recruited from the Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology as subjects. There were 9 males and 25 females, most of them were university students and others outside the university have received undergraduate education or above. Condylar movement ES were obtained using the previous method on the 3D trajectory of condyle. The simulations of condylar movement were projected according to opening movements, protrusion movements, and lateral movements respectively. The total area of the ES and the area proportions of models formed by above different mandibular movements were measured and calculated. The adults' head and maxillofacial 3D models reconstructed by cone beam CT were registered with ES in Geomagic Studio. The inner and outer poles of the condyle, the corrective sagittal axis of the ES, and the median sagittal plane (MSP) were calibrated in registration models using Geomagic Studio, and the parameters were measured as follows: the anteroposterior and medialateral diameters of the condyle, the anteroposterior diameters and the transverse diameters (anterior, middle and posterior parts) of the ES, the angles between the corrective sagittal axis of the ES and MSP (ES-MSP). Pearson correlation analysis was performed by SPSS 24.0. Results: The total area of the ES was (760±133) mm², the opening movement part accounted for (63.3±15.2)%, the protrusion movement part accounted for (14.9±9.6)%, the lateral movement part accounted for (21.8±13.3)%. Parameter measurements were as follows: mediolateral diameters of condyle was (19.8±2.3) mm; anteroposterior diameter of the ES was (21.2±3.1) mm, the transverse diameters (anterior, middle and posterior parts) of the ES were (20.6±2.4), (20.4±2.4), (22.0±2.6) mm, respectively; the transverse diameters of the ES were about 2 mm larger than that of the condyle. The angle between the corrective sagittal axis of ES and the MSP was 6.8°±6.2°. The coefficient of variation (CV) in these parameters showed: CV of the transverse diameters (anterior, middle and posterior parts) of the ES and mediolateral diameter of the condyle were 0.98, 0.99, 0.93, respectively (P<0.001). CV of aera of ES and mediolateral diameter of the condyle was 0.64 (P=0.002). CV of aera of ES and anteroposterior diameter of ES was 0.62 (P=0.004). Conclusions: The 3D envelope surface model formed by mandibular opening movements accounted for the largest proportion of the ES. The corrective sagittal axis of the ES was at an angle to the MSP, the transverse diameters (anterior, middle and posterior parts) of the ES were approximately 2 mm larger than the mediolateral diameter of the condyle, the transverse diameters (anterior, middle and posterior parts) of the ES were highly positively correlated with the mediolateral diameter of the condyle.
Humans ; Adult ; Male ; Female ; Mandibular Condyle ; Cone-Beam Computed Tomography ; Mandible ; Movement ; Temporomandibular Joint

OBJECTIVE: To discover the factors that may affect the use of selective tracheostomy among patients who have undergone head and neck surgeries with free flap reconstruction, so that the patients will not need tracheostomy nor receive the unnecessary treatment. METHODS: Five hundred and thirty-three patients who had undergone head and neck surgery with free flap reconstruction operated by the same team of surgery at Department of Oral and Maxillofacial Surgery at Peking University School of Stomatology from 2015 to 2016 were reviewed. Three hundred and twenty-one (60.2%) of these patients underwent selective tracheostomy. All the patients' demographic information, operation-related information, prior treatments, comorbidities and complications were recorded and analyzed. RESULTS: The patients with defects of the tongue, mouth floor, oropharynx and bilateral mandible, who underwent neck dissection and with previous radiotherapy and smoking habit were more likely to get selective tracheostomy. Usage of bulky soft tissue flap might also add to the risk of airway obstruction and the need of selective tracheostomy, while other factors were not significantly related to the risk of postoperative airway obstruction and the patients could be kept safe without selective tracheostomy. Most cases without tracheostomy were kept safe except one case, while 8.39% of the patients with tracheostomy suffered from tracheostomy related complications, mainly pneumonia and hemorrhage of the tracheostomy wound, yet none led to serious consequences or even death. CONCLUSION Selective tracheostomy is not necessary for patients who have undergone head and neck surgeries with free flap reconstruction except that there are defects at the tongue, oropharynx and mandible. Neck dissection, bulky soft tissue flap reconstruction, previous radiotherapy and smoking habit may also add to the risk of postoperative airway obstruction, while a favorable decision would involve a combination of all the above factors to assure the safety of the postoperative airway for the patients undergone head and neck surgeries with free flap reconstruction.
Airway Obstruction/surgery* ; Free Tissue Flaps ; Head and Neck Neoplasms/surgery* ; Humans ; Postoperative Complications/surgery* ; Reconstructive Surgical Procedures/adverse effects* ; Retrospective Studies ; Tracheostomy

OBJECTIVE: To analyze the clinical characteristics and long-term prognosis of patients with primary bone lymphoma (PBL). METHODS: The clinical data of 21 patients with PBL treated in our center from 2005 to 2018 were analyzed retrospectively, the clinical characteristics and the factors affecting prognosis of the patients were analyzed. RESULTS: The median age of all the 21 newly diagnosed PBL patients was 40(12-71) years old. Ostealgia was the initial symptom in most of the patients (19/21,90.5%). 42.9%(9/21) of the patients showed single bone lesion only. 571% (12/21) of the patients showed diffuse large B cell lymphoma. 28.6% (6/21) of the patients showed anaplastic large cell lymphoma and 9.5% (2/21) of the patients showed T cell lymphoblastic lymphoma. All the patients received chemotherapy (CHOP or CHOP like regimen, 33.3% plus rituximab) with or without radiotherapy and/or autologous hematopoietic stem cell transplantation (ASCT). 18 patients achieved clinical remission (including 15 for CR and 3 for PR). The median follow-up time was 48 months. The 5-year overall survival rate and progression-free survival rate of the patients were was 67.5% and 63.7%, respectively. The single factors analysis showed that ASCT was the important prognostic factor of PFS, while the single or multiple bone lesion was the factors affecting OS of the patients. There were no statistical differences with the effects of age, sex, stage, ECOG score, LDH level, B symptoms and radiotherapy for the prognosis of patients. CONCLUSION Diffuse large B cell lymphoma is the most common pathological type of PBL. Chemotherapy is the main treatment, which can be combined with radiotherapy and/or ASCT. The ASCT and the number of bone lesion are the factors for long time survival of the patients.
Adult ; Aged ; Antineoplastic Combined Chemotherapy Protocols/therapeutic use* ; Cyclophosphamide ; Disease-Free Survival ; Doxorubicin ; Humans ; Lymphoma, Large B-Cell, Diffuse/drug therapy* ; Middle Aged ; Prednisone ; Prognosis ; Retrospective Studies ; Rituximab/therapeutic use* ; Transplantation, Autologous ; Vincristine

A new phloroglucinol was isolated from 50% ethanol extract of Dryopteris fragrans by silica gel column chromatography, Sephadex LH-20 gel column chromatography, thin-layer chromatography(TLC), and preparative liquid column chromatography. On the basis of MS, ~1H-NMR, ~(13)C-NMR, and reference materials, compound 1 was identified as 2,5-cyclohexadien-1-one, 2-{[2,6-dihydroxy-4-methoxy-3-methyl-5-(1-isobutyl)phenyl]methyl}-3,5-dihydroxy-4,4-dimethyl-6-(1-oxobutyl)(1), and named disaspidin BB. Compound 1 was evaluated for its antibacterial activity. The experimental results showed that compared with the commonly used topical antibiotics erythromycin or mupirocin, disaspidin BB exhibited significant antibacterial activities against Staphylococcus epidermidis(SEP), S. haemolyticus(SHA), and methicillin-resistant S. aureus(MRSA)(P<0.05). Additionally, disaspidin BB was sensitive to ceftazidime-resistant SEP1-SEP4, SHA5-SHA7, MRSA8, and MRSA9. The MIC values of disaspidin BB against SEP and SHA were 1.67-2.71 μg·mL~(-1) and 10.00-33.33 μg·mL~(-1) respectively. Disaspidin BB has good antibacterial activities and deserves development as a new anti-infective drug for external use.
Anti-Bacterial Agents/pharmacology* ; Dryopteris ; Methicillin-Resistant Staphylococcus aureus ; Microbial Sensitivity Tests ; Phloroglucinol/pharmacology* ; Plant Extracts/pharmacology*

OBJECTIVES: To investigate the clinical treatment outcomes and the changes of the outcomes over time in extremely preterm twins in Guangdong Province, China. METHODS: A retrospective analysis was performed for 269 pairs of extremely preterm twins with a gestational age of <28 weeks who were admitted to the department of neonatology in 26 grade A tertiary hospitals in Guangdong Province from January 2008 to December 2017. According to the admission time, they were divided into two groups: 2008-2012 and 2013-2017. Besides, each pair of twins was divided into the heavier infant and the lighter infant subgroups according to birth weight. The perinatal data of mothers and hospitalization data of neonates were collected. The survival rate of twins and the incidence rate of complications were compared between the 2008-2012 and 2013-2017 groups. RESULTS: Compared with the 2008-2012 group, the 2013-2017 group (both the heavier infant and lighter infant subgroups) had lower incidence rates of severe asphyxia and smaller head circumference at birth (P<0.05). The mortality rates of both of the twins, the heavier infant of the twins, and the lighter infant of the twins were lower in the 2013-2017 group compared with the 2008-2012 group (P<0.05). Compared with the 2008-2012 group, the 2013-2017 group (both the heavier infant and lighter infant subgroups) had lower incidence rates of pulmonary hemorrhage, patent ductus arteriosus (PDA), periventricular-intraventricular hemorrhage (P-IVH), and neonatal respiratory distress syndrome (NRDS) and a higher incidence rate of bronchopulmonary dysplasia (P<0.05). CONCLUSIONS There is a significant increase in the survival rate over time in extremely preterm twins with a gestational age of <28 weeks in the 26 grade A tertiary hospitals in Guangdong Province. The incidences of severe asphyxia, pulmonary hemorrhage, PDA, P-IVH, and NRDS decrease in both the heavier and lighter infants of the twins, but the incidence of bronchopulmonary dysplasia increases. With the improvement of diagnosis and treatment, the multidisciplinary collaboration between different fields of fetal medicine including prenatal diagnosis, obstetrics, and neonatology is needed in the future to jointly develop management strategies for twin pregnancy.
Bronchopulmonary Dysplasia/epidemiology* ; Female ; Gestational Age ; Humans ; Infant ; Infant, Extremely Premature ; Infant, Newborn ; Pregnancy ; Respiratory Distress Syndrome, Newborn/epidemiology* ; Retrospective Studies ; Treatment Outcome