Instrument separation is a critical complication during root canal therapy, impacting treatment success and long-term tooth preservation. The etiology of instrument separation is multifactorial, involving the intricate anatomy of the root canal system, instrument-related factors, and instrumentation techniques. Instrument separation can hinder thorough cleaning, shaping, and obturation of the root canal, posing challenges to successful treatment outcomes. Although retrieval of separated instrument is often feasible, it carries risks including perforation, excessive removal of tooth structure and root fractures. Effective management of separated instruments requires a comprehensive understanding of the contributing factors, meticulous preoperative assessment, and precise evaluation of the retrieval difficulty. The application of appropriate retrieval techniques is essential to minimize complications and optimize clinical outcomes. The current manuscript provides a framework for understanding the causes, risk factors, and clinical management principles of instrument separation. By integrating effective strategies, endodontists can enhance decision-making, improve endodontic treatment success and ensure the preservation of natural dentition.
Humans ; Root Canal Therapy/adverse effects* ; Consensus ; Root Canal Preparation/adverse effects*

Objective To develop a nomogram model based on the nucleotide-binding oligomer-ization domain-like receptor protein 3(NLRP3)/caspase-1 signaling pathway to predict the value of secondary vascular dementia(VaD)after acute cerebral infarction(ACI)following thrombolytic ther-apy.Methods A total of 289 patients with ACI admitted to Yuncheng Central Hospital Affiliated to Shanxi Medical University from March 2021 to March 2024 were selected as study subjects,and were divided into VaD group(n=60)and non-VaD group(n=229)based on the occurrence of VaD.Rele-vant clinical data were compared between the two groups,and influencing factors for secondary VaD af-ter ACI were analyzed.A nomogram prediction model was constructed and validated.Results The proportions of patients with a history of smoking,hypertension and coronary heart disease,infarction in key areas,responsible large vessel stenosis ≥50％,leukoaraiosis,and thrombolysis benefit were higher in the VaD group than in the non-VaD group(P＜0.05).Logistic regression analysis showed that the degree of responsible vessel stenosis,infarctionin key areas,leukoaraiosis,and the expression of NLRP3,apoptosis-associated speck-like protein containing a CARD(ASC),and caspase-1,which are related to the NLRP3/caspase-1 signaling pathway,were independent influencing factors for sec-ondary VaD after ACI(P＜0.05).Receiver operating characteristic(ROC)curve,calibration curve,and decision curve analysis(DCA)indicated that the nomogram model had high discrimina-tion and predictive efficacy,with significant positive net benefit.Conclusion The independent in-fluencing factors for secondary VaD after ACI include the degree of responsible vessel stenosis,in-farction in key areas,leukoaraiosis,and the expression of NLRP3,ASC,and caspase-1 related to the NLRP3/caspase-1 signaling pathway.The nomogram prediction model established based on these indicators has high predictive value and clinical efficacy.

Objective To construct,implement and evaluate the effectiveness of the virtual simulation technology-based prenatal health education course.Methods The curriculum included 4 parts:"warm delivery room and easy delivery","medicated analgesic delivery","non-medicated analgesic delivery"and"early maternal and infant health care".From May to September 2022,100 primiparas in an obstetrics and gynecology hospital in Zhejiang Province were investigated by convenient sampling method.Random number table method was used to divide the participants into an experimental group and a control group,with 50 participants per group.The control group received conventional health education,while the experimental group received an augmented virtual reality technology-based prenatal health education course during the late stages of pregnancy on this basis.We conducted a post-intervention comparative analysis of antenatal anxiety levels,fear of childbirth,and birth outcomes between the 2 groups.Furthermore,a post-intervention satisfaction survey was administered to the experimental group.Results After intervention,the antenatal anxiety of the experimental group was lower than that of the control group(x2=4.943,P=0.026),and the decrease in fear of childbirth scores was higher than that of the control group(t=3.200,P=0.002).The experimental group was highly satisfied with all of the 4 dimensions of the course,and the overall evaluation was(31.8±3.23)points.However,there were no significant differences in vaginal delivery rate,postpartum bleeding volume,postpartum hemorrhage incidence,perineal injury degree and duration of each labor stage between the 2 groups(P＞0.05).Conclusion The virtual reality technology-based prenatal health education course was effective in improving the antenatal anxiety and fear of childbirth of primipara,and the use satisfaction is high.

The construction of National Regional Centers is a significant strategic deployment to promote the expansion of high-quality medical resources and a balanced regional layout.It introduces the performance of Peking University First Hospital in promoting the construction of National Regional Centre for women and children's hospital with the work mode of"geographical homogenization construction",summarizes effectiveness.It is believed that government support is the foundation,output hospital sinking is the key,and input hospital participation is the guarantee.

The construction of National Regional Centers is a significant strategic deployment to promote the expansion of high-quality medical resources and a balanced regional layout.It introduces the performance of Peking University First Hospital in promoting the construction of National Regional Centre for women and children's hospital with the work mode of"geographical homogenization construction",summarizes effectiveness.It is believed that government support is the foundation,output hospital sinking is the key,and input hospital participation is the guarantee.

Objective To observe the safety and effectiveness of ultrasound-guided femoral nerve combined with femoral artery block to reduce tourniquet reaction in patients undergoing knee arthroplasty.Methods 100 patients(18～75 years old,body mass index 18～30 kg/m2)who were classified as grade Ⅰ-Ⅲ according to ASA standard and received unilateral total knee arthroplasty.The patients were randomly divided into two groups,the ultrasound-guided femoral nerve combined with femoral artery block with general anesthesia was utilized in group NA with 50 cases,and femoral nerve block alone with general anesthesia was used in group N with 50 cases.The target nerve block was guided by ultrasound before induction of anesthesia in both two groups,and anesthesia induction was performed after the block effect was etermined.Patients in two groups underwent surgery under general anesthesia of the laryngeal mask,and all patients under went self-controlled intravenous analgesia(PCIA).If a patient had a visual analogue score(VAS)score>5 after surgery,flurbiprofenate 50 mg will be given intravenously as a remedy for anal-gesia.The patients'SBP,DBP and HR were recorded before anesthesia(T1),1 min before tourniquet inflation(T2),15 min after tourniquet inflation(T3),30 min(T4),45 min(T5),and 60 min(T6),the number of cases of tourniquet hypertension occurring in patients intraoperatively and the amount of nicardipine and esmolol were recorded,and the movement and static VAS scores at 2,6,12,and 24 h after surgery were recorded.the postoperative rescue analgesic requirements and the time of getting out of bed were recorded.The incidence of adverse reactions such as nausea,vomiting,deliriumand infection were also recorded.Results Compared with group N,SBP,DBP and HR were significantly lower in group NA at 45 and 60 min after tourniquet inflation,and the incidence of tourniquet hypertension and the amount of nicardipine and esmolol were also significantly lower(P<0.05),and the time of getting out of bed was advanced(P<0.05);the movement and static VAS scores,the time of the first remedial analgesia,and number of times of remedial analgesia,as well as the occurrence of nausea,vomiting,delirium and infection were not statistically significant.Conclusion Ultrasound-guided femoral nerve combined with femoral artery block can be safely and effectively used to reduce the reaction of tourniquet in patients with knee arthroplasty,and can shorten the time of getting out of bed after surgery,contributing to promoting postoperative rehabilitation.

In order to investigate the changes in lipid metabolism of the host after infection with porcine epidemic diarrhea virus(PEDV),blood,intestinal and cellular samples were collected from PEDV-infected piglets and Vero cells,and the levels of triglyceride(TG)and total cholesterol(TC)were detected by blood biochemical analyses,flow cytometry,and immunofluorescence,and changes in the gene levels of the enzymes related to lipid metabolism of the hosts were detected by qPCR.The results showed that PEDV infection significantly elevated host total lipid levels and sig-nificantly promoted the expression of enzymes related to fatty acid and cholesterol metabolism in the intestine and Vero cells of piglets.In conclusion,PEDV infection leads to an increase in host to-tal lipid levels,remodeling of lipid metabolism in piglets intestine and Vero cells,and lipid metabo-lism gene changes.The results of this study show that lipid metabolism-related genes can be used as a key target to influence PEDV replication,which will provide a new theoretical basis for the subsequent prevention,control and treatment of PEDV infection.

The construction of National Regional Centers is a significant strategic deployment to promote the expansion of high-quality medical resources and a balanced regional layout.It introduces the performance of Peking University First Hospital in promoting the construction of National Regional Centre for women and children's hospital with the work mode of"geographical homogenization construction",summarizes effectiveness.It is believed that government support is the foundation,output hospital sinking is the key,and input hospital participation is the guarantee.

The construction of National Regional Centers is a significant strategic deployment to promote the expansion of high-quality medical resources and a balanced regional layout.It introduces the performance of Peking University First Hospital in promoting the construction of National Regional Centre for women and children's hospital with the work mode of"geographical homogenization construction",summarizes effectiveness.It is believed that government support is the foundation,output hospital sinking is the key,and input hospital participation is the guarantee.

The construction of National Regional Centers is a significant strategic deployment to promote the expansion of high-quality medical resources and a balanced regional layout.It introduces the performance of Peking University First Hospital in promoting the construction of National Regional Centre for women and children's hospital with the work mode of"geographical homogenization construction",summarizes effectiveness.It is believed that government support is the foundation,output hospital sinking is the key,and input hospital participation is the guarantee.