Cemental tear is a rare and indetectable condition unless obvious clinical signs present with the involvement of surrounding periodontal and periapical tissues. Due to its clinical manifestations similar to common dental issues, such as vertical root fracture, primary endodontic diseases, and periodontal diseases, as well as the low awareness of cemental tear for clinicians, misdiagnosis often occurs. The critical principle for cemental tear treatment is to remove torn fragments, and overlooking fragments leads to futile therapy, which could deteriorate the conditions of the affected teeth. Therefore, accurate diagnosis and subsequent appropriate interventions are vital for managing cemental tear. Novel diagnostic tools, including cone-beam computed tomography (CBCT), microscopes, and enamel matrix derivatives, have improved early detection and management, enhancing tooth retention. The implementation of standardized diagnostic criteria and treatment protocols, combined with improved clinical awareness among dental professionals, serves to mitigate risks of diagnostic errors and suboptimal therapeutic interventions. This expert consensus reviewed the epidemiology, pathogenesis, potential predisposing factors, clinical manifestations, diagnosis, differential diagnosis, treatment, and prognosis of cemental tear, aiming to provide a clinical guideline and facilitate clinicians to have a better understanding of cemental tear.
Humans ; Dental Cementum/injuries* ; Consensus ; Diagnosis, Differential ; Cone-Beam Computed Tomography ; Tooth Fractures/therapy*

Objective:To prepare seven standard strains of 2019 novel coronavirus (2019-nCoV), including wild type (WT) strain, Beta variant, Delta variant, Omicron variants (BA.2, BA.5, BQ.1, XBB.1 branches), which could be used to apply for national standard strains.Methods:According to cytopathic effect (CPE), virus titer, whole-virus-genome-sequencing and detection of mycoplasma, the basic biological characteristics of clonal isolation were determined through plaque purification technology.Results:The CPE was mainly characterized by cell shrinkage and exfoliation in Vero cells after infection with seven 2019-nCoV clonal isolations (WT, Beta, Delta, Omicron, BA.2, BA.5, BQ.1 and XBB.1 branches). The result of mycoplasma detection were negative and titers of the clonal isolation from 2nd to 5th generations were stable at 10 5-10 8 TCID 50/ml; the electron microscope showed that the virions were all round or elliptical, with a diameter between 60 nm and 140 nm. The subtypes of 7 strains were identified by whole-virus-genome-sequencing and phylogenetic analysis, with genomic stability after the fifth successive generations of clonal isolation. Conclusions:The series clonal isolation of 2019-nCoV with typical CPE of coronavirus, clear morphological structure, good viral activity and stable genetic characteristics were prepared, and they could be used to apply for national standard strains.

OBJECTIVE To investigate the impact of noise exposure in metallurgical manufacturing on hearing.METHODS 245 workers exposed to noise in an enterprise and 51 administrative staff were tested for air conduction hearing threshold of pure tones at 0.5-8 kHz in both ears,and the equivalent sound level of workplace noise was measured for 8 hours.The hearing threshold of workers in different jobs was statistically analyzed.RESULTS The hearing threshold of workers exposed to noise at 0.5-8 kHz was significantly higher than that of administrative staff;hearing loss mainly occurred at 4 kHz and 6 kHz;the hearing threshold was positively correlated with working age and age,and the hearing threshold of workers over 40 years old and with working age of more than 6 years were higher than 40 dB HL at both ears at 4 kHz and 6 kHz.CONCLUSION The hearing loss of 4 kHz and 6 kHz is most obvious in noise-exposed workers,and age,working age,and noise exposure intensity were risk factors for hearing loss.It is necessary to strengthen the control of noise sources,attach importance to protective measures such as earplugs,and reduce noise exposure time.

Objective:To investigate the efficacy of the intelligent version of the Montreal Cognitive Assessment Scale(MoCA)in identifying mild cognitive impairment(MCI)in elderly inpatients.Methods:Seventy-five patients diagnosed with mild cognitive impairment(MCI group)from the Neurology and Geriatrics Departments of a tertiary hospital in Changsha City, along with 195 patients with normal cognitive function(normal control group), were selected between July 2020 and December 2022.Both groups underwent evaluations using the intelligent version of the Montreal Cognitive Assessment(MoCA)and the Mini Mental State Examination(MMSE), and the results were analyzed.Results:The MCI group showed significantly lower total MoCA scores and MMSE scores[(19.73±2.42) vs.(24.8±2.33)]compared to the normal control group[(24.47±2.02) vs.(26.50±1.65)], with a statistically significant difference( P<0.01).The optimal cut-off score for the MoCA was found to be 23.5 points in diagnosing MCI, showing higher sensitivity, specificity, and kappa value(96.0%, 82.1%, and 0.690)compared to the MMSE scale(90.0%, 62.6%, and 0.428). Conclusions:The intelligent MoCA has a high screening accuracy for identifying MCI in this population, demonstrating superior sensitivity and specificity compared to the MMSE.

Objective To evaluate the effectiveness of different thermal insulation measures on intervention of perioperative hypothermia in patients undergoing abdominal surgery,through a network Meta-analysis.Methods A systematic search through online databases was conducted from the inception of the databases to August 2023.Databases of CNKI,VIP,Wan Fang Data,SinoMed,PubMed,the Cochrane Library,Web of Science and Embase were searched to retrieve randomly controlled trials(RCTs)in the effectiveness of different thermal insulation measures on perioperative hypothermia in patients undergoing abdominal surgery.According to the inclusion and exclusion criteria,two researchers independently screened the retrieved literatures,extracted data and evaluated the quality of acquired data.Revman 5.4,R 4.3.1 and Stata17.0 were used for the network meta-analysis of the acquired data.Results A total of 26 RCTs were included,involving 9 thermal insulation measures that involved with 2 414 patients.Meta-analysis showed that an inflatable blanket combined with warmed intravenous infusion achieved the best effectiveness in maintaining the perioperative core temperature of the patients with abdominal surgery.An inflatable blanket combined with warmed peritoneal lavage fluid achieved the best effectiveness in reduction of the incidence of perioperative hypothermia and shivering.Conclusion This study shows that a combination of inflatable blanket with warmed peritoneal lavage fluid/warmed intravenous infusion can achieve the best effectiveness on intervention of perioperative hypothermia in patients undergoing abdominal surgery.

Objective:To evaluate effect of diammonium glycyrrhizinate(DG)on lipopolysaccharide(LPS)-induced TLR4/NF-κB inflammatory signaling pathway in BV2 microglial cells and to explore its potential regulatory mechanisms on ameliorating neu-roinflammation.Methods:BV2 microglia injury model was induced by LPS and treated with 20 and 60 μmol/L DG.MTS was used to determine vitality of cells.NO level secreted by cells was detected by Griess.Inflammatory factors TNF-α,IL-6,and IL-1β levels in cell supernatant were measured by ELISA.TNF-α,IL-6,IL-1β,TLR4 and MyD88 mRNA levels were detected by RT-qPCR.Western blot was used to determine expressions of TLR4,MyD88,NF-κB,p-NF-κB,IκB-α and p-IκB-α proteins of cells.Results:Compared with control group,LPS-treated BV2 microglia had significantly lower viability(P<0.05),significantly higher NO secretion(P<0.05),significantly up-regulation levels of inflammatory factors TNF-α,IL-6 and IL-1β(P<0.05),and significantly higher mRNA levels of TNF-α,IL-6,IL-1β,TLR4 and MyD88(P<0.05),TLR4,MyD88,NF-κB,p-NF-κB,IκB-α,and p-IκB-α protein expressions were significantly increased(P<0.05).Compared with LPS group,BV2 microglia intervened with different concentrations of DG had significantly higher viability(P<0.05),significantly lower NO secretion(P<0.05),significantly lower TNF-α,IL-6 and IL-1β inflammatory factors levels(P<0.05),significantly lower mRNA levels of TNF-α,IL-6,IL-1β,TLR4 and MyD88(P<0.05),and TLR4,MyD88,p-NF-κB and p-IκB-α protein expressions were significantly reduced(P<0.05).Conclusion:DG can inhibit LPS-induced neuroinflammatory responses in microglia,whose underlying mechanism is suppression of TLR4/NF-κB signaling pathway.

Objective:To study the current status of longitudinal extrauterine growth restriction (EUGR) in extremely preterm infants (EPIs) and to develop a prediction model based on clinical data from multiple NICUs.Methods:From January 2017 to December 2018, EPIs admitted to 32 NICUs in North China were retrospectively studied. Their general conditions, nutritional support, complications during hospitalization and weight changes were reviewed. Weight loss between birth and discharge > 1SD was defined as longitudinal EUGR. The EPIs were assigned into longitudinal EUGR group and non-EUGR group and their nutritional support and weight changes were compared. The EPIs were randomly assigned into the training dataset and the validation dataset with a ratio of 7∶3. Univariate Cox regression analysis and multiple regression analysis were used in the training dataset to select the independent predictive factors. The best-fitting Nomogram model predicting longitudinal EUGR was established based on Akaike Information Criterion. The model was evaluated for discrimination efficacy, calibration and clinical decision curve analysis.Results:A total of 436 EPIs were included in this study, with a mean gestational age of (26.9±0.9) weeks and a birth weight of (989±171) g. The incidence of longitudinal EUGR was 82.3%(359/436). Seven variables (birth weight Z-score, weight loss, weight growth velocity, the proportion of breast milk ≥75% within 3 d before discharge, invasive mechanical ventilation ≥7 d, maternal antenatal corticosteroids use and bronchopulmonary dysplasia) were selected to establish the prediction model. The area under the receiver operating characteristic curve of the training dataset and the validation dataset were 0.870 (95% CI 0.820-0.920) and 0.879 (95% CI 0.815-0.942), suggesting good discrimination efficacy. The calibration curve indicated a good fit of the model ( P>0.05). The decision curve analysis showed positive net benefits at all thresholds. Conclusions:Currently, EPIs have a high incidence of longitudinal EUGR. The prediction model is helpful for early identification and intervention for EPIs with higher risks of longitudinal EUGR. It is necessary to expand the sample size and conduct prospective studies to optimize and validate the prediction model in the future.

Objective:To evaluate the role of O-sialoglycoprotein endopeptidase (OSGEP) in hepatic ischemia-reperfusion injury (HIRI) and the relationship with oxidative stress in mice.Methods:Experiment Ⅰ Twenty-four SPF healthy male C57BL/6 mice, 12 wild-type and 12 OSGEP knockdown, aged 6-8 weeks, weighing 18-22 g, were divided into 4 groups ( n=6 each) by the random number table method: wild-type shamoperation group (Sham group), wild-type HIRI group (HIRI group), OSGEP knockdown+ sham operation group (Sham+ KD group) and OSGEP knockdown+ HIRI group (HIRI+ KD group). Ischemia-reperfusion model was prepared by blocking the hepatic artery and portal vein for 60 min followed by reperfusion in anesthetized animals, the blood vessels were only exposed without occlusion in Sham group and Sham+ KD group, and the blood vessels were clamped for 60 min followed by reperfusion in HIRI group and HIRI+ KD group. The mice were sacrificed after 6-h reperfusion to extract liver tissue samples for microscopic examination of histopathological changes (with an optical microscope after HE staining) which were evaluated using Suzuki score and for determination of the serum concentrations of alanine aminotransferase (ALT) and aspartate aminotransferase (AST), level of reactive oxygen species (ROS) (using the DCFH-DA fluorescent probe method), contents of malondialdehyde (MDA) and glutathione(GSH) in liver tissues (using a colorimetric method) and expression of OSGEP (using Western blot). Experiment Ⅱ The well-growing AML12 cells were divided into 4 groups ( n=30 each) using a random number table method: control group (C group), oxygen-glucose deprivation/restoration (OGD/R) group, OGD/R+ OSGEP knockdown group (OGD/R+ KD group), and OGD/R+ OSGEP knockdown negative control group (OGD/R+ NC group). Group C was cultured under normal conditions. Group OGD/R was subjected to O 2-glucose deprivation for 6 h followed by restoration of O 2-glucose supply for 24 h in OGD/R group. In OGD/R+ KD group, stable transfection of AML12 cells with OSGEP knockdown was performed prior to the experiment, and the other procedures were the same as those previously described. The cell survival rate was measured by the CCK-8 assay, the release of lactate dehydrogenase (LDH) was measured, the DCFH-DA method was used to detect the levels of ROS, and the contents of MDA and GSH were determined using a colorimetric method. Results:Experiment Ⅰ Compared with Sham group, the expression of OSGEP was significantly down-regulated, the serum concentrations of AST and ALT, Suzuki score, levels of ROS and content of MDA were increased, and the GSH content was decreased in HIRI group ( P<0.05), and no significant change was found in each parameter in Sham+ KD group ( P>0.05). Compared with HIRI group, the serum concentrations of AST and ALT, Suzuki score, levels of ROS and content of MDA were significantly increased, and the GSH content was decreased in HIRI+ KD group ( P<0.05). Experiment Ⅱ Compared with group C, the expression of OSGEP was significantly down-regulated, the cell survival rate and GSH content were decreased, and the release of LDH, levels of ROS and content of MDA were increased in group OGD/R ( P<0.05). Compared with OGD/R group, the cell survival rate and GSH content were significantly decreased, and the release of LDH, levels of ROS and content of MDA were increased in OGD/R+ KD group ( P<0.05), and no significant change was found in each parameter in OGD/R+ NC group ( P>0.05). Conclusions:OSGEP plays an endogenous protective role in HIRI by inhibiting oxidative stress in mice.

Objective To investigate the clinical efficacy of tiotropium bromide in the treatment of patients with acute exacerbation of chronic obstructive pulmonary disease(AECOPD)complicated with acute respiratory failure.Methods A total of 106 patients with AECOPD complicated with acute respiratory failure admitted to the First People's Hospital of Huzhou from March 2019 to March 2022 were selected and divided into observation group and control group according to random number table method,with 53 cases in each group.Both groups were given routine treatment.The control group was treated with noninvasive biphasic positive airway pressure ventilation.The observation group was treated with tiotropium bromide on the basis of control group.Both groups were treated for 14 days.The clinical efficacy,lung function,blood gas index,inflammatory factors and adverse reactions were compared between two groups.Results The total effective rate of observation group was significantly higher than that of control group(94.34%vs.79.25%,χ2=5.267,P=0.023).After treatment,forced expiratory volume in one second(FEV1),FEV1/forced vital capacity,peak expiratory flow,pH,percutaneous arterial oxygen saturation and arterial partial pressure of oxygen in observation group were significantly higher than those in control group(P<0.05),while arterial partial pressure of carbon dioxide,interleukin-6,interleukin-8,tumor necrosis factor-α and hypersensitive C-reaction protein were lower than those in control group(P<0.05).There were no significant differences in the incidence of adverse drug reactions and ventilator adverse reactions between two groups(P>0.05).Conclusion Titropium bromide in the treatment of AECOPD complicated with acute respiratory failure can significantly improve the curative effect,improve pulmonary function and arterial blood gas,but attention should be paid to the timely treatment of adverse reactions of dry mouth.

Abstract School based lifestyle interventions have many advantages, which can effectively reduce the prevalence of overweight and obesity, improve children and their families knowledge of overweight and obesity, and enhance their cognition of behaviors related to energy balance. Moreover, it can improve the level of cardiometabolic risk (CMR). By searching PubMed, CNKI and Wanfang databases, the article review the effects of school based physical activity and dietary interventions on children s blood pressure, blood lipids, blood glucose, and other CMR indicators, and analyze the differences among different groups of people, such as gender, age, and race, in order to provide the evidence for future school based intervention studies on overweight and obesity in children.