Objective:To study the effects of 3D printing digital positioning guide plate for orthodontic treatment of impacted teeth.Methods:88 patients with single impacted teeth(excluding third molars)with a total of 88 impacted teeth were included and were randomly divided into guide group and conventional group(n=44).Helical nickel-titanium push springs were placed be-tween adjacent teeth on both sides of the impacted teeth to open the gap.CBCT scanning and 3D reconstruction,and digital positio-ning guides were used to assist the positioning.Results:The operation time of the guide group and conventinal group was(26.42±4.94)min and(35.78±9.27)min(P＜0.001),the average bone removal area of the window was(66.03±4.67)mm2 and(69.75±7.22)mm2(P＜0.05),respectively.43 and 41 embedded teeth were successfully erupted in the guide group and the conventinal group,respectively(P＞0.05).The average eruption time of the impacted teeth in the guide group and conentinal group was(176.68±9.89)d and(178.18±10.17)d respectively(P＞0.05).Before treatment,there was no significant difference in the levels of IL-6,IL-1β and TNF-α in saliva between the 2 groups(P＞0.05).After one week of treatment,the levels of saliva IL-6,IL-1β and TNF-α in the guide group were lower than those in the conventinal group(P＜0.05).Conclusion:The use of 3D print-ing digital positioning guide plate for orthodontic treatment of impacted teeth can provide accurate positioning,avoid damage to ad-jacent teeth and surrounding vascular and nerve bundles,reduce the difficulty of operation,shorten operation time,and reduce fen-estration and boneless area,can reduce postoperative inflammatory factor secretion and inhibit periodontal inflammatory response.

Objective:To study the effects of 3D printing digital positioning guide plate for orthodontic treatment of impacted teeth.Methods:88 patients with single impacted teeth(excluding third molars)with a total of 88 impacted teeth were included and were randomly divided into guide group and conventional group(n=44).Helical nickel-titanium push springs were placed be-tween adjacent teeth on both sides of the impacted teeth to open the gap.CBCT scanning and 3D reconstruction,and digital positio-ning guides were used to assist the positioning.Results:The operation time of the guide group and conventinal group was(26.42±4.94)min and(35.78±9.27)min(P＜0.001),the average bone removal area of the window was(66.03±4.67)mm2 and(69.75±7.22)mm2(P＜0.05),respectively.43 and 41 embedded teeth were successfully erupted in the guide group and the conventinal group,respectively(P＞0.05).The average eruption time of the impacted teeth in the guide group and conentinal group was(176.68±9.89)d and(178.18±10.17)d respectively(P＞0.05).Before treatment,there was no significant difference in the levels of IL-6,IL-1β and TNF-α in saliva between the 2 groups(P＞0.05).After one week of treatment,the levels of saliva IL-6,IL-1β and TNF-α in the guide group were lower than those in the conventinal group(P＜0.05).Conclusion:The use of 3D print-ing digital positioning guide plate for orthodontic treatment of impacted teeth can provide accurate positioning,avoid damage to ad-jacent teeth and surrounding vascular and nerve bundles,reduce the difficulty of operation,shorten operation time,and reduce fen-estration and boneless area,can reduce postoperative inflammatory factor secretion and inhibit periodontal inflammatory response.

Objective:To design a modified S1PR3 specific agonist, GPS-725.017, and investigate its protective effect on acute lung injury by promoting macrophage clearance of bacteria.Methods:A short peptide derived from the intracellular region of S1PR3 receptor was named GPS725.017, which was modified with norleucine (Nle) and myristicacid (myr) at its N terminus. Mice were divided into the sham operation group, solvent group and GPS-725.017 treatment group. The acute lung injury model was induced by endotracheal injection of E. coli (5×10 6 CFU), and the experimental group was treated with GPS-725.017 (10 mg/kg). The 48-h survival rate of mice was recorded. After 5 h of modeling, the bacterial load and inflammatory cytokines in peripheral blood and lung were detected, and Vps34 protein content in alveolar macrophages was determined by Western blot. After 12-h of modeling, lung tissues were collected for H&E staining and pathological scores. Results:Compared with the solvent group, the survival rate of mice in the GPS-725.017 treatment group was significantly improved ( P<0.01), the bacterial CFU in blood and alveolar lavage fluid was significantly lower than that in the solvent group ( P<0.001), and the levels of TNF-α and IL-1β in blood and alveolar lavage fluid were significantly lower than those in the solvent group ( P<0.001). Western blot showed that the expression level of Vps34 protein in alveolar macrophages was significantly higher than that in the solvent group ( P<0.01). Histopathology result showed that the pathological damage of lung in the treatment group was significantly less than that in the solvent group ( P<0.001). Conclusions:The modified synthetic S1PR3 specific agonist GPS-725.017 could specifically activate the S1PR3 receptor on the membrane of alveolar macrophages and up-regulate the expression level of intracellular Vps34 protein, which can promote the removal of bacteria in alveolar macrophages, significantly reduce the degree of lung injury and improve the survival rate in ALI mice.

Objective:To investigate the effectiveness of postoperative radiotherapy using shrinking field for patients with extremity soft tissue sarcoma (STS), mainly focusing on the local control rate and adverse events.Methods:Clinical data of 49 extremity STS patients who received postoperative intensity-modulated radiotherapy in the First Hospital of Tsinghua University from October 2017 to March 2021 were retrospectively analyzed. Target volumes were contoured on CT and MRI fusion images. The tumor bed was defined as GTV tb, with 3 cm expansion in the longitudinal direction and 1.5 cm expansion in the radial direction to construct CTV (the target volume should be properly repaired according to the anatomical barrier, and the edema area around the tumor should be included). GTV tb and CTV were expanded in all directions by 0.5 cm to construct PTV1 and PTV2 respectively, at a dose of 95%PTV1 63-66 Gy, 95%PTV2 50-56 Gy,1.8-2.0 Gy/f. The dose of surgical volume should be given at 70 Gy for patients who had a microscopic positive margin. Results:The median follow-up time was 32.1 months (7.9-45.6 months). The 3-year local failure-free survival (LFFS), overall survival (OS)and distant metastasis-free survival (DMFS) were 91.7%,77.6% and 71.5%, respectively. Univariate analysis showed that patients with a microscopic positive margin were more likely to develop local recurrence ( P<0.05). The incidence of grade 2 or above wound complications, joint stiffness, fracture, edema and skin fibrosis were 2%, 4.1%, 2%, 8.2% and 26.5%, respectively. Conclusion:Postoperative radiotherapy with shrinking field provides excellent local control rate and low incidence of late adverse events in patients with extremity STS.

Objective:To explore the outcomes of standard endovascular aneurysm repair (EVAR) for abdominal aortic aneurysm (AAA) with complex neck anatomical features.Methods:Clinical data of AAA patients received standard EVAR from Jan 2004 to Dec 2018 were retrospectively collected. Based on pre-operative computed tomography angiography (CTA) data, patients were divided into complex neck group and non-complex neck group to compare the results between them.Results:There were 88 patients (66.2%) in complex neck group and 45 patients (33.8%) in non-complex group. There was no significant difference in peri-operative characters (blood loss, contrast volume used, hospital stay time, technical success rate) and follow-up results (late re-intervention, late endoleak, aneurysm enlargement, survival rate),all P>0.05.Multivariant logistic regression analysis revealed neck diameter larger than 31 mm was related with late re-intervention ( OR=24.975, P=0.02). Conclusion:Standard EVAR for AAA with complex neck characters does not cause higher perioperative complications and less favorable long term survival rate.

OBJECTIVE: To explore the safety, feasibility and short-term efficacy of intracavitary uncut Roux-en-Y (URY) anastomosis in digestive tract reconstruction following laparoscopic total gastrectomy (LTG). METHODS: From November 2015 to January 2018, 67 gastric cancer patients underwent intracavitary URY following LTG to reconstruct the digestive tract at Oncological Surgery Department of Fujian Provincial Hospital. There were 41 males and 26 females with age of 50 to 81 (61.9±7.4) years and body mass index (BMI) of (23.4±3.2) kg/m². Among 67 patients, 19 were gastric cardia carcinomas, 33 were gastric body carcinomas, and 15 were gastric fundus carcinomas; tumor size was (3.4±2.3) cm; 22 were Borrmann type I, 15 were type II, 21 were type III, and 19 were type IV; 29 were highly or moderately differentiated adenocarcinoma, 23 were lowly differentiated adenocarcinoma, and 15 were signet-ring cell carcinoma. After conventional laparoscopic D2 radical gastrectomy, the duodenum was closed and dissociated at 2 cm below the pyloric ring using the Echelon-flex endoscopic articulated linear Endo-GIA stapler, and the esophagus was dissociated above the esophagogastric junction (EGJ).URY and digestive tract reconstruction were performed under the direct vision of laparoscope: (1) Side-to-side esophagojejunostomy: An incision of 0.5 cm was made in the left lower edge of the esophageal closed end; jejunum about 25 cm distal away from the Treitz ligament was elevated to the lower end of esophagus; another incision of 0.5 cm was made in the contralateral of mesenteric side; both arms of the linear Endo-GIA stapler were inserted into the windows opened through esophagus and jejunum respectively to complete side-to-side anastomosis. The common opening of esophagus and jejunum was closed to complete esophagojejunostomy, forming the chyme outflow tract. (2) Side-to-side Braun jejunojejunostomy: Incisions of 0.5 cm were made in the proximal jejunum about 10 cm away from the esophagojejunal anastomosis and 35-40 cm away from the contralateral of mesenteric side of distal jejunum respectively for proximal-distal side-to-side jejunojejunostomy. The common opening was closed to form the biliopancreatic duodenal juice outflow tract. (3) Closure of the input loop jejunum in the esophagojejunal anastomosis: The input loop jejunum 2-3 cm away from the esophagojejunal anastomosis was closed using the non-blade linear stapler (ATS45NK), and the biliopancreatic duodenal juice reflux was blocked. Clinical data of these patients were collected for retrospective case series study. Surgical and digestive tract functional recovery, perioperative complications, as well as postoperative nutritional status were observed. Moreover, related indexes, such as anastomosis function and tumor recurrence were evaluated through endoscopic and imaging examinations during postoperative follows-up. RESULTS: All the 67 patients completed the surgery successfully. The mean operative time was (259.4±38.5) minutes, digestive tract reconstruction time was (38.2±13.2) minutes, intraoperative blood loss was (73.4±38.4) ml, and number of harvested lymph node was 36.2±14.2. The mean distance from upper resection margin to upper tumor edge was (3.3±1.2) cm, distance from upper resection margin to dentate line was (1.2±0.7) cm, and 1 case had positive upper incisal margin, which became negative after the second resection. Moreover, the average length of the auxiliary incision was (3.2±0.4) cm. The mean postoperative intestinal exhaust time was (52.8±26.4) hours, time to liquid diet was (64.8±28.8) hours, and postoperative hospital stay was (8.4±2.5) days. The morbidity of postoperative complication was 10.4%(7/67). Among these 7 cases, 4 cases were grade IIIa of Clavien-Dindo classification, including 2 with esophagojejunal anastomosis leakage, 1 with duodenal stump leakage, and 1 with abdominal infection, and all these patients were recovered after conservative treatment. All the 67 patients were followed up. The mean nutrition index 12 months after surgery was 53.4±4.2, diameter of esophagojejunal anastomosis was (3.9±0.6) cm, the incidence of Roux-en-Y stasis syndrome was 3.0% (2/67), and the incidence of reflux esophagitis was 4.5% (3/67). No patient had recanalization of the closed input loop of esophagojejunal anastomosis, anastomotic stenosis, obstruction, or tumor recurrence at anastomosis. CONCLUSION Intracavitary URY anastomosis following LTG for digestive tract reconstruction is safe and feasible, leading to fast postoperative recovery of digestive tract function and favorable short-term efficacy.
Anastomosis, Roux-en-Y ; methods ; Anastomosis, Surgical ; Female ; Gastrectomy ; methods ; Humans ; Jejunum ; Laparoscopy ; Male ; Retrospective Studies ; Stomach Neoplasms ; surgery

Objective To evaluate the clinical efficacy and safety of different stitching methods,over-the-scope-clip (OTSC) and metal clips combined with nylon rope (King closure),for full-layer gastric wall defect.Methods Data of 75 cases,who underwent endoscopic full-thickness resection (EFTR) of gastric SMTs from May 2015 to May 2018 in our endoscopy center were retrospectively analyzed.According to the closure method,the patients were divided into the OTSC group (20 cases) and the King closure group (55 cases).Comparison was made in gender,age,the largest diameter of tumor,the location of tumor,defect surface diameter,total operating time,defect closure time,closure success rate,the length of hospital stays,cost and postoperative complications between the two groups,Results The baseline data were comparable,and there were no significant differences in age,gender,tumor location,tumor diameter,and defect surface diameter between the two groups(all P＞0.05).The success rate of closure was 100％ in both groups.In terms of length of hospital stay,there was no significant difference between the two groups (t =1.13,P=0.268).The total operating time was 63.24±43.22 min in the King closure group versus 47.60± 18.13 min in the OTSC group (t =2.20,P =0.030).The closure time of the defect surface was 20.85 ± 16.35 min in the King closure group versus 10.95±5.20 min in the OTSC group (t =2.65,P=O.010).Hospitalization costs were 24 200±800 yuan in the King closure group versus 36 200±2 350 yuan in the OTSC group (t=6.21,P＜0.001).Postoperative abdominal elevation radiographs in both groups indicated a small amount of subphrenic free gas,and no intervention was given due to the small amount of gas and no obvious symptoms.No late bleeding,recurrent perforation,infection or other complications occurred after operation,and all patients were discharged successfully.Six months after surgery,15 patients (27％) in the King closure group developed metal clips or nylon rope residue,which were successfully removed by endoscopy.The anastomosis clamp of nighteen patients (95％) in the OTSC group were in the original position.None of the patient received open surgery.Conclusion OTSC and King closure are both safe and effective in the treatment of full-thickness defect of gastric wall.OTSC has the advantages of short total operation time and short closure time,but with high cost.

Objective:To develop the methods for the determination of calcined calamine and borneol in Jinniu ophthalmic remedy. Methods:The content of zinc oxide in calcined calamine was determined by an EDTA coordination titration method. A DB-WAX capillary column (30 m ×0.32 mm,0.5 μm) was used with an FID as the detector and ethylacetate as the solvent to determine the content of borneol. The column temperature was 150 ℃, the injection port temperature was 180 ℃, the detector temperature was 200 ℃, the split ratio was 5 :1,and the flow rate was 1 ml·min-1. Results:The recovery of zinc oxide was 101.5% with the RSD was 1.2%(n = 9). The linear range of borneol was 0.1-5.0 μg(r = 0.999 9). The recovery of borneol was 98.18% with the RSD was 0.8%(n = 9). The content of zinc oxide and borneol in the samples was 0.38-0.59 g·g-1and 0.13-0.21 g·g-1,respectively. Conclusion:The method is simple and accurate with high reproducibility and promising stability, which can be used for the quality control of Jinniu ophthalmic remedy.

Objective:To investigate the induction and differentiation potential of ADSCs by tissue culture method,and to preliminary study on the origin of ADSCs.Methods:Using adipose tissue culture method to culture human ADSCs.The third generation of ADSCs for the adipogenic and osteogenesis differentiation,and staining by oil red O and alizarin red S.HE staining was performed after the seventh day culture of adipose tissue.Results:The primary human ADSCs were successfully cultured with adipose tissue culture method.ADSCs cultured to the eighth generation,still maintained a good proliferation ability and cell morphology.ADSCs can be successfully induced into adipose cells and bone cells.ADSCs were mainly distributed around the mesenchymal vascular and connective tissue,by HE staining of adipose tissue after seven days of culture.Conclusion:The cells that were cultured with adipose tissue have the potential to adipogenic and osteogenesis differentiation.The ADSCs were mainly distributed around the mesenchymal vascular and connective tissue.

To investigate the effectiveness of retrograde puncture of popliteal artery in lower extremity arteriosclerosis obliterans ( ASO ) patients classified as TASC ( Tans-Atlantic Inter-Society Consensus) C/D.Retrospective analysis of 35 lower extremity ASO patients, 28 male and 7 female , the mean age was 72 ±8, 23 cases of Rutherford 3, 8 cases of Rutherford 4 and 4 cases of Rutherford 5. Preoperative ABI was 0.35 ±0.14, Lesion length in CT angiography ( CTA ) was ( 18 ±5 ) cm.The technique success rate of 35 cases was 100%.The puncture time was (6 ±4) min.6 cases used 4 F sheath and 29 cases used no sheath technology at the puncture site.In 27 cases guide wires passed retrograde through the occluded superficial femoral artery lesion and returned to the true lumen.8 cases of SAFARI technology to established the guild wire track.The complication rate of retrograde puncture was 14.2%( 5/35), 2 cases of postoperative hematoma appeared at the puncture site the next day, 2 cases of pseudoaneurysms emerged and 1 case of postoperative arteriovenous fistula at the puncture site of popliteal area were found by Doppler ultrasonography before discharged.All 5 patients were recovered by conservative treatment.The retrograde puncture of popliteal artery is a safe and reliable method.