BACKGROUND:To optimize the oral implant design in the abutment angle has an important effect on bone resorption, and meanwhile, the high bite force from patients is also crucial to rebuild bone absorption.
OBJECTIVE:To optimize the model design of the maxilary anterior teeth using Ansys Workbench 13.0 software and to investigate the stress size on the cortical and cancelous bone from different angled abutments and different loads of the central incisor.
METHODS:A three-dimensional finite element model of the V-shaped cylindrical threaded implants in the maxilary bone. Abutment angle was set as 0°, 5°, 10°, 15°, 20°, 25°, 30°, and the load stress was set as 90, 105, 120, 135, 150, 165, 180, 195, 210 N. Occlusion of the central incisor was simulated on the implants, and then, buccolingual mechanical loads were loaded on the center of prostheses to observe the effects of different abutment angles and loads on the Von Mises peak stress of the maxila and mandible.
RESULTS AND CONCLUSION:Under the influence of a single factor, when the abutment angles acted as variables, the Von Mises peak stress of the cortical and cancelous bone was respectively increased by 60.60% and 69.30% under labial or palatal loads; when the loading stress acted as variables, the Von Mises peak stress of the cortical and cancelous bone was increased by 68.74% and 69.30% under buccolingual loads. When the loading stress was less than 150 N and the abutment angle was less than 25°, the slop of tangent for the mandible Von Mises stress response curve was-1 to 0. It seems from the mechanical analysis that the stress of cancelous bone is more susceptible to abutment angle and load stress; the optimal abutment of screwed implant should be designed to an angle less than 25° and an bite force less than 150 N.

Objective To evaluate the best experimental technique with high-sensitivity and specificity for enhancing positive rate of syphilis screen test and preventing the blood dissemination of this disease.Methods Comparison of the results of TP-ELISA,TRUST and TPPA methods of syphilis examination was performed.Results Using three methods to exam 43,323 samples,299 samples were for positive syphilis.Among them, 294 positive samples with the ELISA method,the positive rate of syphilis test was 98.33%(294/299):92 positive samples with TRUST method,the positive rate only 30.77%(92/299);239 positive samples with TPPA method,the positive rate 79.93%(239/299).Conclusion TP-ELISA method with high sensitivity is suitable for the instrument standardization and data preservation,which is an ideal method for blood screen test of syphilis.For guarantee of blood safety and conventience and economic benefit of blood syphilis screen test, it is the best way to use both TP-ELISA and TRUST methods.The specificity of TPPA method is perfect, which is suitable for confirmation test of syphilis positive samples.

Objective:To establish a quality control standard for psoraleae fructus tinctures. Methods:The identification was de-tected by TLC on silica gel G plates with hexane-ethyl acetate (8∶2) as the developing solvent. An HPLC method was applied in the quantitative determination of psoralen and isopsoralen as the effective components. The analytical column was Intersil ODS-3 (250 mm × 4. 6 mm,5 μm) with methanol-water(45∶55) as the mobile phase;the flow rate was 1 ml·min-1;the detection wavelength was at 246 nm and the column temperature was set at 35℃. Results:The characteristic spots for psoralen and isopsoralen were identified by TLC. The concentration of psoralen showed good linearity within the range of 4. 88-187. 50μg·ml-1(r=0. 999 9)and the average re-covery was 102. 63% and RSD was 0. 43%. The concentration of isopsoralen showed good linearity within the range of 4. 25-163. 20μg ·ml-1(r=0. 999 9), and the average recovery was 102. 37% and RSD was 1. 13%. Conclusion: The qualitative and quantitative methods are simple, accurate, feasible and repeatable, which can be used in the quality control of psoraleae fructus tinctures.

Objective: To establish an HPLC method for the determination of coenzyme A in coenzyme complex for injection. Methods:The content determination was performed on an Intersil ODS-3 column with methanol-pH 6. 5 phosphate buffer solution (10∶90) as the mobile phase. The detection wavelength was 259 nm and the flow rate was 1. 0 ml·min-1 . The column temperature was 30℃ and the injection volume was 20 μl. Results:The linear range of coenzyme A was 1.624-32.482 u·ml-1(r=0.999 9). The average recovery was 102. 36% and RSD was 1. 14%(n=6). Conclusion: The method is simple, accurate and reproducible, and it can be used for the quality control of coenzyme complex for injection.

Objective To establish an HPLC method for the simultaneous determination of quercetin and kaempferol inKaempferia galanga L..Methods ODS2 C18 (5μm, 4.6 mm×150 mm) was used as chromatographic column; methanol-0.4% phosphate (47:53) was the mobile phase; the flow rate was 1 mL/min; column temperature was 30℃; the detection wavelength was 367 nm; the injection volume was 10μL.Results Quercetin showed good linear relationship in the range of 0.016 5–1.65μg (r=0.999 7). The average recovery rate was 96.8%, RSD=2.02%; kaempferol showed good linear relationship in the range of 0.014 6–1.46μg (r=0.999 5). The average recovery rate was 97.3%, RSD=1.77%.Conclusion The method is simple, accurate, and with good reproducibility, which can be used for content determination of quercetin and kaempferol inKaempferia galanga L..

OBJECTIVE:To establish a method for the content determination of kaempferol in Kaempferia galanga. METH-ODS:HPLC was performed on the column of Diamonsil ODS2 C18 with mobile phase of methanol-0.4% Phosphoric acid solution at a flow rate of 1 ml/min,detection wavelength was 367 nm,column temperature was 30℃,and injection volume was 10 μl. RE-SULTS:The linear range of kaempferol was 0.001 58-0.158 mg/ml;RSDs of precision,stability and reproducibility tests were low-er than 3%;recovery was 95.52%-99.32%(RSD=1.47%,n=6). CONCLUSIONS:The method is simple,accurate and reproduc-ible,and can be used for the content determination of kaempferol in K. galanga.

Objective To evaluate the effects of sirolimus on scopolamine-induced cognitive dysfunction in rats.Methods Thirty male Wistar rats,aged 3 months,weighing 200-250 g,were equally randomized into 3 groups:normal saline group (NS group),scopolamine group (SC group) and scopolamine + sirolimus group (SS group).Normal saline,scopolamine 0.8 mg/kg and sirolimus 3.5 mg/kg + scopolamine 0.8 mg/kg were injected intraperitoneally in groups NS,SC and SS,respectively,and the injection was continued for 14 consecutive days.The cognitive function was assessed by Morris water maze test on 15th day.After behavior test,the rats were sacrificed and the prefrontal cortex and hippocampus were harvested for determination of amyloid β protein (Aβ) and Tau protein expression.Results Compared with NS group,the escape latency was significantly prolonged,the ratio of time spent in the target quadrant was decreased,Aβ expression in prefrontal cortex and hippocampus was upregulated and Tau protein expression in prefrontal cortex and hippocampus was down-regulated in group SC (P ＜0.05 or 0.01).Compared with SC group,the escape latency was significantly shortened,the ratio of time spent in the target quadrant was increased,Aβ expression in prefrontal cortex and hippocampus was down-regulated and Tau protein expression in prefrontal cortex and hippocampus was up-regulated in group SS (P ＜ 0.05 or 0.01).Conclusion Sirolimus can significantly improve scopolamine-induced cognitive dysfunction in rats and the changes in the expression of Aβ and Tau protein in prefrontal cortex and hippocampus may be involved in the mechanism.

Objective To establish a method for determination of phenylethanoid glycoside and acteoside in Plantago Herba. Methods UV-visible spectrophotometric method was used for the determination of the content of phenylethanoid glycosides compounds in Plantago Herba. HPLC method was used for the determination of acteoside in Plantago Herba. Chromatographic column with C18 ODS2 (4.6 mm × 150 mm, 5 μm) was used. Acetonitrile-0.1%formic acid (13:87) was as mobile phase; the flow rate was 1 mL/min; the detection wavelength was 332 nm; the column temperature was 30 ℃; the sample volume was 10 μL. Results The contents of phenylethanoid glycoside in Plantago Herba from different producing areas were among 1.03%–3.47%. Acteoside with peak area over the 0.0062–1.55 mg range showed a good linear relationship; the sample recovery rate was 98.9%, and the RSD was 1.6%. The contents of acteoside in Plantago Herba from different producing areas was among 0.18%–0.56%. Conclusion The method is simple, stable and reproducible, which can be used for the determination of phenylethanoid glycoside and acteoside in Plantago Herba from different producing areas and provide experimental basis for quality control of Plantago Herba.

Objective To explore how to reduce the incidence of pelvic mass after hysterectomy,and to evaluate clinical characteristics and the risks.Methods A retrospective study was carried out in 85 patients who returned for surgery due to a pelvic mass after prior hysterectomy for benign disease at Peking Union Medical College Hospital from January 2011 to June 2016.Results The majority of pelvic masses arising after hysterectomy and requiring surgery were benign (74％,63/85),while 19％ (16/85) were malignant and 7％ (6/85) were borderline.The most common type was ovarian endometrioma (24％,20/85) which usually occurs within the 5 years (16 cases),however,ovarian tumors (18 cases) were more likely to occur ≥10 years after hysterectomy.Characteristics associated with significantly increased likelihood of ovarian endometrioma were mainly ascribed to younger age [(47±5) years old],prior presence of endometriosis or adenomyosis (65％,13/20) and shorter time to pelvic mass onset [(3 ±3) years],as opposed to ovarian tumors (all P＜0.01).Additionally,higher number of prior abdominal surgeries significantly intensified the risk (RR=9.410,95％ CI:1.099-80.564,P=0.041).Conclusions The occurrence of pelvic mass after hysterectomy is tightly related to prior histologic findings,and particularly for ovarian endometrioma.Higher number of prior abdominal surgery will exacerbated the risk.It is effective to prevent the pelvic mass in women after hysterectomy if treat patients for the purpose of the risk factors.

Objective To evaluate different postoperative medications as maintenance treatment for rectovaginal endometriosis (RVE) patients after conservative surgery. Methods RVE patients who underwent transvaginal partial excision from January 2007 to September 2016 with regular outpatient follow-up were retrospectively screened. Those followed by a levonorgestrel-releasing intrauterine system (LNG-IUS) insertion or oral contraceptive drospirenone/ethinylestradiol (DRSP/EE) 3 mg/30μg administration were enrolled. Variations in endometriosis-related pain, sexual function and quality of life were measured by visual analogue scale (VAS), female sexual function index (FSFI) and short form 36-item health survey (SF-36) respectively. Results There were a total of 102 RVE patients with 48 (47.1%, 48/102) in LNG-IUS group and 54 (52.9%, 54/102) in DRSP/EE group included. A rapid and marked improvement was observed after 3 months postoperative medical treatment compared to preoperative in both groups (P＜0.01). In dysmenorrhea, for LNG-IUS group (2.5±0.8) versus (7.6±1.3;P＜0.01), for DRSP/EE group (2.7±0.6) versus (7.7 ± 1.4;P＜0.01);in FSFI, for LNG-IUS group (23.5 ± 2.0) versus (21.0 ± 2.7;P＜0.01), for DRSP/EE group (23.4 ± 1.2) versus (21.5 ± 2.2; P＜0.01); in SF-36, both groups had obvious improvements in physical component summary and mental component summary (P＜0.01), for LNG-IUS group (74±13) versus (56±19), (75±13) versus (55±17), for DRSP/EE group (73±11) versus (59±15), (75±9) versus (54±14). These effects were maintained stably and progressively during postoperative medication at 6-, 12-, 24-month follow up. Conclusion Transvaginal partial excision combined postoperative LNG-IUS or DRSP/EE treatment is a safe and viable technique to alleviate pain, improve sexual function and quality of life.