The left maxilla of a patient was resected because of tumor,and the defect was reconstruted with fibular transplantation.The autonomous dental implant robot technology was used to achieve precise implantation of multiple implants and immediate denture restoration within the limited left maxilla.The surgery was minimally invasive and efficient,and significantly reducing patient post-operative discomfort.The final restoration was completed 6 months after surgery.

The left maxilla of a patient was resected because of tumor,and the defect was reconstruted with fibular transplantation.The autonomous dental implant robot technology was used to achieve precise implantation of multiple implants and immediate denture restoration within the limited left maxilla.The surgery was minimally invasive and efficient,and significantly reducing patient post-operative discomfort.The final restoration was completed 6 months after surgery.

Objective:To evaluate the effect of the impaction of posterior wall on the prognosis following open reduction and internal fixation for fractures of acetabular posterior wall.Methods:A retrospective study was conducted to analyze the data from the 83 patients with fracture of acetabular posterior wall who had been consecutively treated by open reduction and internal fixation at Department of Orthopaedics and Traumatology, Beijing Jishuitan Hospital from January 2017 to December 2020. The patients were divided into 2 groups based on involvement of posterior wall impaction. In the impaction group of 33 cases, there were 26 males and 7 females with an age of (47.4±11.6) years; in the non-impaction group of 50 cases, there were 43 males and 7 females with an age of (41.3±12.0) years. The quality of postoperative fracture reduction, the function of the affected hip at the last follow-up, and the complication rate during follow-up were compared between the 2 groups. Multifactorial binary logistic regression and age subgroups were used to analyze the effects of posterior wall impaction on functional outcomes.Results:The age, rate of associated injuries in other body parts, and rate of posterior wall comminution in the impaction group were significantly higher than those in the non-impaction group ( P<0.05), but there was no statistically significant difference in other general data of patients between the 2 groups ( P>0.05). All patients were followed up for (44.5±13.3) months after surgery. The rate of anatomical reduction in the non-impaction group (96.0%, 48/50) was significantly higher than that in the impaction group (57.6%, 19/33) ( P<0.05), and the good and excellent rate by the modified Merle d'Aubigné & Postel scale at the last follow-up in the non-impaction group (84.0%, 42/50) was significantly higher than that in the impaction group (51.5%, 17/33) ( P<0.05). There was no significant difference in the incidence of complications between the 2 groups ( P>0.05). After adjusting for age and gender, the difference in hip function was still significantly different between the 2 groups ( OR=0.23, 95% CI: 0.06 to 0.79, P=0.020). The effect of posterior wall impaction on functional outcomes was statistically significant in patients aged ≥50 years ( P=0.008), whereas the difference was not statistically significant in patients aged <50 years ( P=0.194). Conclusions:Compared with non-impaction ones, acetabular fractures of posterior wall impaction tend to lead to poorer quality of reduction, which in turn affects the postoperative recovery of hip joint function. The impact of impaction fractures on functional recovery is more significant in patients aged 50 years and above.

Objective To investigate the impact of succinate dehydrogenase(SDH)on the modulation of human sperm functions.Methods The isolated human sperm were co-incubated with different concentrations(10,20,40 mmol/L)of SDH inhibitor disodium malonate for one or two hours.The activity of the SDH was measured by commercially available reagent kit,while the protein level of the SDH catalytic subunit SDHA was determined through Western blot analysis.Sperm functions were analyzed:1)The impact of disodium malonate on important mo-tility parameters of un-capcitated sperm including progressive motility rate(PR),total motility(TM),average pathvelocity(VAP)and the ability of capacitated sperm to penetrate viscous media were be assessed using a com-puter aided semen analysis system.2)Effect of disodium malonate on sperm survival rate was evaluated using the Eosin-Nigrosin microscopy.3)The incidence of acrosome reaction in capacitated sperm was be detected by PSA-FITC staining assay following disodium malonate treatment.Results Disodium malonate had no effect on expression of SDH catalytic subunit SHDA protein in human sperm.However,it inhibited the catalytic activity of the SDH,sperm forward motility,total motility,and the ability of sperm to penetrate viscous media.These inhibitory effects were positively correlated with the concentration of disodium malonate.Furthermore,disodium malonate had no any influence on the occurrence of spontaneous acrosome reaction in capacitated sperm.Conclusions Disodium mal-onate impairs human sperm motility by inhibiting succinate dehydrogenase activity.

Objective:To investigate the potential factors influencing the extent of coronary artery lesion in acute coronary syndrome (ACS) patients with an emphasis on the role of serum SIRT1.Methods:We assessed the clinical data from 81 ACS patients admitted to China-Japan Friendship Hospital. Serum SIRT1 was detected by enzyme linked immunosorbent assay (ELISA), and the extent of coronary artery lesion was evaluated by SYNTAX score before revascularization. All the patients were divided into two groups: high SYNTAX score (severe coronary artery lesion, n=38) and low SYNTAX score (moderate coronary artery lesion, n=43), by means of the median of SYNTAX score. Potential factors influencing SYNTAX score were analyzed through multiple linear regression analysis. Results:Compared with the low SYNTAX score group, patients in the high SYNTAX score group had higher serum SIRT1 level [379.38 (490.14) ng/L vs. 242.95 (173.85) ng/L, P<0.001] and frequency of coronary artery disease family history (42.11% vs. 20.93%, P=0.039). There was no statistical difference among other factors between the two groups. Serum SIRT1 was positively correlated with SYNTAX score in ACS patients ( R=0.452, P<0.010). Serum SIRT1 (ln adjusted), age and estimated glomerular filtration rate were independently correlated with SYNTAX score (ln adjusted) in multiple linear regression analysis (Adjusted R2=0.330, P<0.001). Conclusions:For the first time, we discussed the correlation of serum SIRT1 with extent of coronary artery lesion in ACS patients. Cardiologists should pay more attention to high-risk patients in order to improve the prognosis of ACS patients through timely revascularization strategies.

Objective To investigate the role of peripheral CD14+monocyte-macrophages in the recognition of phosphorylated antigen by γδ T cells and its relationship with treatment outcome. Methods Three kinds of γδ TCR tetramers were used to stain PBMC collected from patients with tuberculosis ( TB) and neonatal umbilical cord blood samples. The proportions of various TB-specific antigen presenting cells (APC) in peripheral blood were analyzed, and their relationships with treatment outcome were assessed based upon clinical data. Results CD14+monocyte-macrophages both in tuberculosis patients′ peripheral blood and neonatal umbilical cord blood were the strongest binding cells to CD277 antibody and γδ TCR tet-ramers. The median (P50) of CD14+monocyte-macrophages reached the highest peak after taking anti-tu-berculosis treatment for about one month and patients′condition was improved obviously during this period. Conclusion This study elucidated that CD14+monocyte-macrophages accounted for the largest proportion of APC when γδ T cells recognized phosphorylated antigens, which provided reference data for further study on the mechanism of γδ T cells restrictively recognizing phosphorylated antigen and their significance in innate and adaptive immunity.

Objective: To investigate the characteristics, temporal trend of silicosis, and provide basis for risk assessment and precise prevention and control of occupational diseases. Methods: Using descriptive statistics to analyze the reported cases of silicosis by SPSS 20.0 software. Reported silicosis cases, the constituent ratio, the incidence age and the working age at onset were analyzed by a linear trend test. Analyzing the variation trends of regional, industry, economic type and enterprise scale distributions by the chi-square trend test. Moreover, using Moran's I method for spatial autocorrelation analysis and trend-surface analysis. Results: (1) During 2006 to 2015, Guangdong province had reported 1, 428 cases of silicosis, mainly gathered in Foshan, Zhongshan, Guangzhou, Shenzhen, which included 1391 male cases accounting for 97.41%. And the average incidence age was 45 (39, 51) . The average working age of onset was 9 (5.5, 15) . In economic type distribution, the private economy took the main part, accounting for 59.1%. In enterprise scale distribution, it was dominated by small and medium enterprises (SMEs) , accounting for 32.4% and 37.3% respectively. In industry distribution, most cases were gathered in materials and mining industry, accounting for 32.1% and 22.9% respectively. (2) The number of silicosis cases, the incidence age and the working age of onset showed a rising trend (P<0.01) . Meanwhile, the constituent ratios of medium-sized enterprises and building materials industry were increasing (P<0.05) . The annual variation trends of regional, economic type and age distributions were not statistically significant (P> 0.05) . (3) The spatial distribution trend showed an inverted U type, which was firstly raised and then declined from south to north and from east to west. The distribution characteristic demonstrated some high-high cluster areas, including Chancheng, Nanhai, Shunde, Panyu, Dongguan, Pengjiang, and Zhongshan. While Wuhua showed a high-low outlier form (P<0.01) . Conclusion Silicosis cases, age and working age of onset were on the rise, as well as the industry and enterprise scale distributions of occupational diseases presented a certain trend in Guangdong province from 2006 to 2015. There were high-high cluster and high-low outlier phenomena in spatial distribution with spatial correlation. Therefore, our work of silicosis epidemic trend and distribution may provide some bases for the occupational disease risk assessment and control.

Objective: To explore the occupational disease spatial distribution characteristics in Guangzhou and Foshan city in 2006-2013 with Geographic Information System and to provide evidence for making control strategy. Methods: The data on occupational disease diagnosis in Guangzhou and Foshan city from 2006 through 2013 were collected and linked to the digital map at administrative county level with Arc GIS12.0 software for spatial analysis. Results: The maps of occupational disease and Moran’s spatial autocor-relation analysis showed that the spatial aggregation existed in Shunde and Nanhai region with Moran’s index 1.727, -0.003. Local Moran’s I spatial autocorrelation analysis pointed out the "positive high incidence re-gion" and the "negative high incidence region" during 2006~2013. Trend analysis showed that the diagnosis case increased slightly then declined from west to east, increase obviously from north to south, declined from? southwest to northeast, high in the middle and low on both sides in northwest-southeast direction. Conclusions The occupational disease is obviously geographical distribution in Guangzhou and Foshan city. The corresponding prevention measures should be made according to the geographical distribution.

OBJECTIVETo investigate the cytochrome P450 2E1 (CYP2E1) RsaI/PstI and DraI polymorphisms in workers exposed to benzene.

METHODSA cross-sectional survey was carried out. A total of 71 workers exposed to benzene were included in observation group and the same number of people without occupational benzene exposure were included in control group. Blood samples from the two groups were collected and genotyping for CYP2E1 RsaI/PstI and DraI were conducted using the polymerase chain reaction-restriction fragment length polymorphism.

RESULTSThere were no significant differences in CYP2E1 DraI genotype and allele distributions between the observation group and the control group (χ² = 2.374, P > 0.05; χ² = 2.113, P > 0.05). Significant differences in CYP2E1 RsaI/PstI genotype and allele distributions between the two groups were observed (χ² = 9.129, P < 0.01; χ² = 6.028, P < 0.05).

CONCLUSIONMutations at CYP2E1 RsaI/PstI can enhance the expression of CYP2E1 and this suggests individuals with the mutated gene have increased susceptibility to chronic benzene poisoning.

Alleles ; Benzene ; poisoning ; Cross-Sectional Studies ; Cytochrome P-450 CYP2E1 ; genetics ; metabolism ; Genetic Predisposition to Disease ; Genotype ; Humans ; Poisoning ; genetics ; Polymerase Chain Reaction ; Polymorphism, Genetic ; genetics ; Polymorphism, Restriction Fragment Length