BACKGROUND:The threaded conical implant has a good ability to control micro movements and is conducive to immediate loading.However,the effects of double-threaded conical cylindrical implants and conical cylindrical implants on stress distribution and initial stability of implant-bone interface after immediate loading have not been reported. OBJECTIVE:To investigate the impact of double-threaded conical cylindrical implants and conical cylindrical implants on the biological distribution of the implant and the surrounding bone interface during immediate loading in the mandibular molar region. METHODS:(1)Three-dimensional finite element analysis:Conical beam CT scans of the mandible and first molar of a volunteer were used to develop a basal model of the mandible.The double-threaded conical cylindrical implants and conical cylindrical implants were assembled with the mandibular models,and an immediate-load(or delayed implantation)implant model(a total of four models)for the first mandibular molar was established.Loads in four directions(100 N):axial,lingual and buccal 45°,mesial and distal,and buccal and lingual,were applied to the central fossa of each model's crown.Three-dimensional finite element method was used to analyze the implant displacement and the stress distribution at the implant-bone interface.(2)In vitro experiment:With the assistance of the oral implant robot,the double-threaded conical cylindrical implants and conical cylindrical implants were implanted on the same artificial bone pieces,separately,and the immediate load model of immediate implant implantation(or delayed implantation)was established in vitro(a total of four groups of models).Osstell resonance frequency analyzer and SmartPeg sensor were used to measure the implant stability coefficient in four vertical directions:front,rear,left,and right measurements,evaluate the initial stability,and verify the finite element analysis results. RESULTS AND CONCLUSION:(1)The displacement difference between double-threaded conical cylindrical implants and conical cylindrical implants was small when the immediate loading of delayed implantation was applied,but the maximum stress value of conical cylindrical implant-bone interface was greater than that of double-threaded conical cylindrical implant-bone interface.When the immediate loading of immediate implantation was applied,the maximum stress value and the maximum displacement of bone around the implant appeared when the load was applied in mesiodistal direction.The stress value of the conical cylindrical implant reached 298.84 MPa and the maximum displacement was 0.31 mm,both of which were larger than that of the double-threaded conical cylindrical implant.(2)The results of in vitro experiments showed that the stability coefficient of the double-threaded conical cylindrical implant was greater than that of the conical cylindrical implant.(3)Compared with the conical cylindrical implant,the double-threaded conical cylindrical implant has higher initial stability under immediate loading,suggesting that the use of double-threaded conical cylindrical implant should be given priority in clinical immediate loading.

Objective To explore the effect of ropivacaine combined with dexmedetomidine in transversus abdominis plane block(TAPB)on postoperative stress hormones and cognitive function in patients undergoing laparoscopic radical gastrectomy.Methods A total of 80 patients undergoing laparoscopic radical gastrectomy at the First Affiliated Hospital of Xinxiang Medical University from April to October 2023 were selected as the research subjects.According to different anesthesia methods,the patients were divided into the observation group and the control group,with 40 patients in each group.Patients in the observation group were injected bilaterally with 2.5 g·L-1 ropivacaine and 0.5 μg·kg-1 dexmedetomidine for TAPB,with 20 mL injection on each side.Patients in the control group were injected bilaterally with 2.5 g·L-1 ropivacaine for TAPB,with 20 mL injection on each side.Mean arterial pressure(MAP)and heart rate(HR)were recorded at the time of admission to the operating room(T1),immediately after endotracheal intubation(T2),40 minutes after pneumoperitoneum(T3),and 15 minutes after extubation(T4).Radioimmunoprecipitation was used to detect serum cortisol(COR)level,and enzyme-linked immunosorbent assay was used to measure serum norepinephrine(NE)and epinephrine(E)levels at 1,6,12,and 24 hours after surgery.Visual analog scale(VAS)was used to assess pain at rest,and Ramsay sedation scale(RSS)was used to evaluate sedation depth.The doses of propofol and sufentanil were compared between the two groups.Serum β-amyloid(Aβ)and S100β protein levels at 1 day before surgery,1 and 3 days after surgery were detected by using the enzyme-linked immunosorbent assay,and cognitive function was assessed at the same time points by using the mini-mental state examination(MMSE).Results At T,and T2,there was no significant difference in MAP and HR between the control group and the observation group(P＞0.05).At T3 and T4,MAP and HR in the observation group were significantly lower than those in the control group(P＜0.05).At 1,6,and 12 hours postoperatively,VAS score in the observation group was significantly lower than that in the control group(P＜0.05).At 24 hours postoperatively,there was no significant difference in VAS score between the control group and observation group(P＞0.05).At 1 and 6 hours postoperatively,RSS score in the observation group was significantly higher than that in the control group(P＜0.05).At 12 and 24 hours postoperatively,there was no significant difference in RSS score between the control group and observation group(P＞0.05).At 1,6,and 12 hours postoperatively,COR,NE,and E levels in the observation group were significantly lower than those in the control group(P＜0.05).At 24 hours postoperatively,there was no significant difference in COR,NE,and E levels between the control group and observation group(P＞0.05).The doses of propofol and sufentanil in the observation group were significantly lower than those in the control group(P＜0.05).One day before surgery,there was no significant difference in MMSE score between the control group and observation group(P＞0.05).At 1 and 3 days postoperatively,MMSE score in the observation group was significantly higher than that in the control group(P＜0.05).One day before surgery,there was no significant difference in serum Aβ and S100β protein levels between the control group and observation group(P＞0.05).At 1 and 3 days postoperatively,serum Aβ and S100β protein levels in the observation group were significantly lower than those in the control group(P＜0.05).Conclusion Ropivacaine combined with dexmedetomidine in TAPB in radical gastrectomy can significantly reduce postoperative pain,increase sedative effect,prolong the duration of TAPB,and benefit patients'postoperative recovery with reduced cognitive impairment.

The incidence of psycho-cardiological diseases， i.e.， cardiovascular diseases combined with psychological disorders， is increasing year by year. Brain-derived neurotrophic factor （BDNF） plays a role in the pathogenesis of such diseases. According to the theory of collateral diseases， our team innovates the concept of regulating mental activity by dredging collaterals in the treatment of psycho-cardiological diseases and summarizes the concepts of "heart of Qi and collaterals" and "heart of vessels and collaterals". We believe that obstructed collaterals and disturbed mental activity run through the whole course of psycho-cardiological diseases， being the core pathogenesis. BDNF closely related to the core pathogenesis can regulate nerve and vascular inflammation， alleviate oxidative stress， and mediate a variety of signaling pathways， thereby promoting the survival and repair of nerve cells and vascular endothelial cells to regulate emotion and protect the heart. Therefore， BDNF is one of the potential biomarkers for clinical treatment of psycho-cardiological diseases. Collateral obstruction caused by blood stasis is specifically manifested as collateral deficiency， blood stasis， and Qi stagnation in collaterals. It can easily lead to inflammation， free radical generation， and antioxidant system changes in the patients with psycho-cardiological diseases， which can cause oxidative stress damage， affect the BDNF level， and result in mental disorders， such as anxiety and depression. Disturbed mental activity is mainly caused by the disturbance in the heart of Qi and collaterals， which is specifically manifested as the disturbance of the mind and liver soul. It is prone to cause anxiety or depression symptoms， which is closely related to the BDNF-mediated abnormal activation of neural circuits， nerve injury， and inflammation. This article elaborates on the theoretical connotation and pathological mechanism of regulating mental activity by dredging collaterals in the treatment of psycho-cardiological diseases from the perspective of BDNF， aiming to provide new ideas for the prevention and treatment of psycho-cardiological diseases and collateral diseases.

Objective To explore the effect of urine mixing degree on 24-hour urinary total protein(24 h UTP)in patients with chronic kidney disease(CKD).Methods From October 1,2023 to December 31,2023,30 hospitalized patients who needed to complete 24 h UTP testing in Zhongshan Hospital,Fudan University were selected.A 5 L unified container was used to collect urine for 24 hours.After collection and one hour's standing,the urine sample was divided into upper,middle,and lower equal parts according to volume,which was defined as direct-sampling group.Then,the urine samples were fully mixed with a magnetic stirrer and sampled again according to the above-mentioned three-equal sampling method,which was defined as mixed-sampling group.The generalized estimating equation was used to compare the urinary protein concentration before and after mixing and at different sampling location.Results The results of generalized estimating equation showed that after controlling the variable"sampling position",there was no significant difference in urinary protein concentration between the direct-sampling group and the mixed-sampling group.After controlling the variable"mixing method",there was still no significant difference in urinary protein concentration at different sampling positions.After adjusting the covariates such as age,gender,and estimated glomerular filtration rate(eGFR),the results were consistent.Conclusions With standard protocol,the entire 24-hour urine sample is a relatively even-distributed solution.After the total urine collection is completed,the temporary sample can be directly extracted from any level of the original urine within 1 hour,and the urine protein concentration of the sample multiplied by the urine volume can reflect the 24 h UTR.

Background: The impact of para-aortic lymphadenectomy (PALD) on prognosis and quality of life (QoL) for IB2-IIA2 cervical cancer patients remain controversial. And whether intraoperative frozen pathology exam on common iliac lymph nodes could help predict para-aortic lymph node (PALN) metastasis was unanswered with high-level evidence. Methods A multi-center, randomized controlled study is intended to investigate the effect of PALD on the prognosis and QoL in cervical cancer patients and to assess the value of intraoperative frozen pathological evaluation of common iliac nodes metastasis for the prediction of PALN metastasis. After choosing whether to receive intraoperative frozen pathological examination of bilateral common iliac lymph nodes, eligible patients will be randomly assigned (1:1) to receive PALD or not. The primary end point is 2-year progression-free survival (PFS). The secondary end points include 5-year PFS, 2-year overall survival (OS), 5-year OS, adverse events (AEs) caused by PALD, AEs caused by radiotherapy and QoL. A total of 728 patients will be enrolled from 8 hospitals in China within 3-year period and followed up for 5 years.

Objective:To search for the clinical indicators in differentiating Graves′ disease from subacute thyroiditis (SAT).Methods:Retrospective analysis was performed on thyroid function measurement of 265 cases of newly diagnosed Graves′ disease, 76 cases of SAT with thyrotoxicosis, 100 cases of non-toxic thyroid nodules, 105 cases of autoimmune thyroid diseases with normal thyroid function, and 151 cases of outpatients with normal thyroid function and without thyroid diseases.Results:Free triiodothyronine(FT 3)/free thyroxine(FT 4) ratio of Graves′ disease patients was significantly higher than that of SAT patients with thyrotoxicosis (0.65±0.29 vs 0.32±0.75, P<0.05). Receiver operating characteristic curve(ROC curve) analysis of FT 3/FT 4 ratio between Graves′ disease group and SAT group showed that FT 3/FT 4 ratio greater than 0.4 with a sensitivity of 98.11% and a specificity of 83.81% for diagnosis of Graves′ disease. Conclusion:FT 3/FT 4 ratio greater than 0.4 is helpful for differentiating Graves′ disease from subacute thyroiditis with thyrotoxicosis.

With the widely development of psychiatric clinical researches,the ethical issue has been concerned gradually.Although the ethical review has strict rules on informed consent,there are many problems and challenges on informed consent implementation because of the special mental illness population.According to the relevant laws and regulations,combined with the characteristics of clinical psychiatric researches,this paper discussed the protection of subjects' fights and interests during the implementation of informed consent in psychiatric clinical researches,from the following aspects:providing a quiet,comfortable,and relatively independent environment for the participants to ensure informed consent,guaranteeing full informed consent time,choosing qualified researchers for informed consent,ensuring the effective process of informed consent,and guiding the subjects to correctly sign their names and the date.

OBJECTIVE:To provide reference for rational use of Clindamycin hydrochloride injection. METHODS:The utilization of Clindamycin hydrochloride injection in orthopedic inpatients of a third grade class A general hospital dur-ing 2013-2015 was analyzed and investigated retrospectively. The rationality evaluation standard was formulated to evaluate the rationality of drug use in those patients. RESULTS:A total of 189 orthopedic inpatients received Clindamycin hydro-chloride injection,and there were 152 cases of irrational drug use among which there were 16 cases of irrational therapeu-tic drug use and 136 cases of irrational prophylactic drug use. Irrational drug use mainly included irrational usage and dos-age(86.18%),irrational drug selection(44.74%)and irrational drug replacement(15.79%). Two patients suffered from ADE,i.e. rash and nausea. After drug withdrawal and symptomatic treatment,the symptoms were improved,but irrational drug use was found in one case. CONCLUSIONS:The utilization of Clindamycin hydrochloride injection is irrational in or-thopedic department. It is necessary to further standardize medication behavior and guarantee the safety and effectiveness of drug use.

Objective To investigate the changes and related factors of maternal thyroid autoantibodies during early pregnancy. Methods Urinary iodine concentration( UIC) , serum thyroid stimulating hormone( TSH) , free thyroxine ( FT4 ) , thyroid-peroxidase antibody ( TPOAb ) , thyroglobulin antibody ( TgAb ) concentrations were determined in 7 190 women during early pregnancy in an iodine-sufficient region of China. Results The prevalence of TPOAb positivity and TgAb positivity were 8. 7% and 12. 0% respectively. The prevalence of overt hypothyroidism and subclinical hypothyroidism increased significantly in group of thyroid antibody positivity. The prevalence of TPOAb positivity and TgAb positivity presented a U-shaped curve, ranging from mild iodine deficiency to iodine excess, especially increased significantly in the group with UIC<100 μg/L. Conclusion Prevalence of thyroid antibodies positivity became higher during early pregnancy. The positive thyroid autoantibodies during pregnancy were significantly associated with maternal hypothyroidism. Both iodine excess and iodine deficiency are risk factors of positive thyroid antibodies.

ObjectiveTo investigate the clinical efficacy of acupuncture in treating Tourette's syndrome.MethodEighty patients were allocated, using a random number table, to a treatment group of 40 cases and a control group of 40 cases. The treatment group received acupuncture and the control group, Western drug treatment.ResultThe YGTSS score decreased significantly in the two groups of patients after treatment(P<0.01). After treatment, the range of decrease in the YGTSS tic score was larger in the treatment group than in the control group; there was a statistically significant difference (P<0.05). The total efficacy rate was higher in the treatment group than in the control group (P<0.05). The incidences of adverse reactions were significantly lower in the treatment group than in the control group.ConclusionThe effect and safety of treatment for Tourette's syndrome are higher in the treatment group than in the control group.