微种植体支抗压低上前牙治疗露龈笑

目的探讨应用微种植体支抗治疗上前牙槽骨垂直向发育过度的露龈笑患者,改善牙龈显露的程度。方法选取16例因上前牙槽骨垂直向发育过度导致露龈笑的患者,在侧切牙与尖牙间植入微种植体支抗,施加100g力压低上前牙。治疗前后分别收集头颅定位侧位片、上前牙的根尖片、牙模型、微笑时面下1/3照片及上前牙的龈沟深度;对实验结果进行统计分析。结果压低时间为(6.7±1.2)个月。(1)牙龈显露减少(2.3±0.5)mm;(2)头影测量分析显示,上中切牙阻力中心点压低(2.6±0.3)mm,覆减少(2.8±0.6)mm,切缘与腭平面的距离减少(3.1±0.7)mm,鼻唇角增加(5.4±2.9)°,P<0.05;(3)压低结束时,上前牙的临床牙冠变短,未见明显牙根吸收。结论应用微种植体支抗可以有效地压低上前牙,改善露龈笑,但牙龈的改建速度比牙齿的压低速度慢。     

Identification of signal transduction pathways involved in the formation of platelet subpopulations upon activation

Platelets are formed elements of blood. Upon activation, they externalize phosphatidylserine, thus accelerating membrane‐dependent reactions of blood coagulation. Activated platelets form two subpopulations, only one of which expresses phosphatidylserine. This study aimed to identify signalling pathways responsible for this segregation. Gel‐filtered platelets, intact or loaded with calcium‐sensitive dyes, were activated and labelled with annexin V and antibodies, followed by flow cytometric analysis. Calcium Green and Fura Red dyes were compared, and only the latter was able to detect calcium level differences in the platelet subpopulations. Phosphatidylserine‐positive platelets produced by thrombin had stably high intracellular calcium level; addition of convulxin increased and stabilized calcium level in the phosphatidylserine‐negative subpopulation. PAR1 agonist SFLLRN also induced calcium rise and subpopulation formation, but the resulting platelets were not coated with alpha‐granule proteins. Adenylatecyclase activator forskolin inhibited phosphatidylserine‐positive platelets formation several‐fold, while its inhibitor SQ22536 had no effect. This suggests that adenylatecyclase inactivation is necessary, but not rate‐limiting, for subpopulation segregation. Inhibition of mitogen‐activated protein kinase kinase (U0126) and glycoprotein IIb‐IIIa (Monafram^®) was without effect, whereas inhibitors of phosphatidylinositol 3‐kinase (wortmannin) and Src tyrosine kinase (PP2) decreased the procoagulant subpopulation threefold. These data identify the principal signalling pathways controlling platelet heterogeneity.     

重组人细胞外基质磷酸化糖蛋白对人牙髓细胞体外矿化的影响

目的:探讨细胞外基质磷酸化糖蛋白(Matrix extracellular phosphogl ycoprotein,MEPE)对人牙髓细胞(human dental pulpcells,HDPCs)在体外的矿化能力的影响,从而了解该蛋白在牙齿生长发育过程中的作用。方法:常规方法培养获得人牙髓细胞,实验组中使用的MEPEs的浓度为100μg/L。通过Vonkossa染色观察MEPE对人牙髓细胞矿化的影响。结果:MEPE蛋白能促进人牙髓细胞的矿化。结论:MEPE具有促进人牙髓细胞的矿化的能力,可能在牙齿生长发育过程中起着重要的作用。     

Development of Compositions and Production Technology for Gels with a Solid Dispersal of Nitrofural

Pharmaceutical Chemistry Journal - Compositions of gels with solid dispersions of nitrofural at a concentration of 0.04% were screened. Studies of the organoleptic properties, identity, assay of...     

Synthesis of H-Lys-Lys-Gly-OH Tripeptide and Study of Its Acute Toxicity

Pharmaceutical Chemistry Journal - Tripeptide H-Lys-Lys-Gly-OH was synthesized. Its toxic properties and biological activity were studied. The tripeptide was synthesized by extending the peptide...     

Synthesis,structure, antioxidant activity,and water solubility of trolox ion conjugates

The interaction of trolox with ammonia, alkylamines of different classes, and amino derivatives of heterocyclic compounds, including nitroxyl radicals and alkaloids, led to the production of ammonium salts called ion conjugates (ICs). Five ICs were characterised by X-ray diffraction. This is the first time a wide range of ICs were made from trolox with amines, and ESI-MS data demonstrated they have the potential to generate pseudomolecular [(A^?B⁺)?+?H]⁺ ions. For all obtained trolox ICs, a significant increase (1–3 orders of magnitude) in water solubility was achieved while retaining high antioxidant activity. ICs synthesised from two biologically active fragments may be used to create polyfunctional agents with varying solubility and bioavailability.     

Potential causes of insufficient bladder contrast opacification and premature microbubble destruction during contrast-enhanced voiding urosonography in children

Contrast-enhanced voiding urosonography (ceVUS) has been recognized as a child-friendly examination with high diagnostic accuracy for vesicoureteric reflux detection. A single bolus and the infusion techniques of ceVUS are described. Insufficient bladder contrast opacification during the filling phase and premature destruction of SonoVue microbubbles might occur. Data regarding SonoVue's features, doses, bladder contrast opacification, US bladder parameters, urine catheter, antibiotic prophylaxis, and childrens behaviors were collected to discover the possible causes of the contrast vanishing observed during bladder filling in 10% of examinations and in the later phase of ceVUS in 5% of examinations. An updated ceVUS examination protocol is suggested.     

声频共振辅助治疗突发性耳聋的临床观察

目的探讨声频共振辅助治疗突发性耳聋中的效果。方法我科住院治疗的突发性耳聋患者136例,随机分为两组,每组68例。对照组采用常规药物治疗及心理护理;治疗组在对照组治疗基础上加用患耳声频共振治疗。治疗1、2 w后评定疗效。结果治疗1 w后,治疗组总有效率73.8%,对照组总有效率66.2%,治疗组疗效优于对照组,差异有统计学意义(p<0.05);治疗2 w后,治疗组总有效率92.6%,对照组总有效率80.9%,治疗组疗效优于对照组,差异有统计学意义(p<0.05)。结论声频共振治疗的应用可提高突发性耳聋的治疗效果,总有效率有明显提高。     

齿科材料研磨粉尘粒径尺寸的相关研究

目的:对齿科三种不同材料研磨粉尘颗粒的尺寸进行检测及相关探讨。方法:制备齿科树脂、Vitallium金属及二氧化锆体瓷研磨粉尘各5mg,分别溶于50ml的75%酒精、丙酮及六偏磷酸钠溶液,形成悬液、制片,应用微分干涉相差显微镜(DIC)观察,对其粒径尺寸进行测量。结果:结果显示调磨后的三种齿科粉尘粒径尺寸均不相同,其中树脂粉尘颗粒的Dmax最大,为7.27μm,Dx约为4.46μm;二氧化锆体瓷的粉尘Dmax最小,其中Dmin仅为0.45μm,Dx为1.35μm;Vitallium金属粉尘颗粒的粒径位于二者之间,Dx约为3.67μm。结论:齿科三种不同材料研磨粉尘的粒径尺寸均不同,每种材料的粉尘粒径均小于10μm。由于齿科粉尘粒径较小,长期暴露于齿科粉尘环境下,可能会引起齿科医师肺组织的病变,建议临床医师加强自我防护。