Effects of tooth rotation on neighboring teeth and periodontal tissues

In the present experiment,we investigate the effects of orthodontic tooth rotation onneighboring teeth and periodontal tissues.The second maxillary incisors of 16 randomly selecteddogs were subjected to rotation at a magnitude of 100 grams and a moment of 550 g·mm in a du-ration of 3 to 56 days.Then sections were prepared for histological examination.The findings re-vealed that,due to tooth rotation,neighboring teeth were drifted and rotated(82%),and therewere disarrangement and hyalinization of the periodontal ligament(88%),remodeling of the pe-riodontium(86%)and root resorption(32%)were also observed.These results demonstratethat tooth rotation may exert marked effects on neighboring teeth and periodontal tissues,whichmay be of important clinical significance.     

A study of the rotation rate of single-rooted teeth in dogs

Sixteen one-year-old dogs were used in our experiment.We rotated the maxillary secondincisors of the dogs,applying a force of 100g and a moment of 550g·mm.The duration of theexperiment varied from 72h to 8 weeks.Activation was performed once every 2 weeks and the impressions were taken in order to measure the angles of rotation.The results of our experiment showthat the rotation rate of single-rooted tooth in dogs is 3.04/week.The graph shows the form ofgradual stairs.This paper introduces a new specialized experimental apparatus for tooth rotation.The angles of rotation are measured geometrically.     

住院癌症患者口腔衰弱现状及影响因素分析

目的 调查住院癌症患者口腔衰弱现状,分析其影响因素,为针对性干预提供参考。方法 采用便利抽样法抽取207例住院癌症患者为调查对象,采用一般资料问卷、口腔衰弱指数-8、口腔健康评估量表、营养风险筛查量表2002、衰弱量表、领悟社会支持量表进行调查。结果 住院癌症患者口腔衰弱发生率为64.3%,年龄、吸烟史、化疗史、口干、义齿、口腔健康不良、身体衰弱是住院癌症患者口腔衰弱的影响因素（均P＜0.05）。结论 住院癌症患者口腔衰弱发生率较高,医护人员需根据其影响因素采取预防管理措施,控制口腔衰弱的发生和发展。     

翻转课堂在骨科教学中的可行性及必要性分析

翻转课堂目前已逐渐成为教育领域的关注焦点,但在医学教育领域内,目前该技术应用不多。该文介绍了翻转课堂的由来、特点,重点讨论了在骨科教学中应用的可行性、必要性,并分析了目前推广应用该技术的难点和障碍所在,旨在推动医学教育的不断发展。     

老年性上消化道疾病的临床及x线特点

本文报告144例老年性上消化道疾病,并与112例青年病人进行比较。初步探讨老年人上消化道疾病在临床及 x 线上有以下特点:1.病史长,平均12.3年;2.一般性消化道症状多,典型症状少,并且消化道肿瘤、胃下垂,憩室明显增多;3.并发症多,为36.3%;4.x 线表现功能性改变、粘膜破坏、胃壁僵硬多见而明显。     

水中抗阻训练对类风湿关节炎居家患者手足关节功能康复的影响

目的 探讨水中抗阻训练对类风湿关节炎居家患者手足关节功能康复的影响.方法 将风湿免疫科门诊就诊的类风涅关节炎患者71例根据就诊日期单双日分为观察组(n=35)和对照组(n=36).对照组接受常规护理及关节功能训练;观察组在对照组基础上实施水中抗阻训练,每天训练30～60 min,每周至少训练3d.比较两组干预前后双手握...     

Role of arachidonoylethanolamine in blood pressure regulation in volume-resistant patients on peritoneal dialysis

In this study we explored the possible role of arachidonoylethanolamine (AEA) in regulating blood pressure in patients on continuous ambulatory peritoneal dialysis (CAPD). One hundred and five patients on CAPD were enrolled. Volume status was evaluated by the overhydration (OH) value obtained by bioimpedance analysis. OH?<?2.0?kg was defined as normal volume (NV) and OH????2.0?kg as high volume (HV). Home mean systolic blood pressure <130?mmHg was defined as controlled hypertension (CHT) and ??130?mmHg as uncontrolled hypertension (UHT). The patients were divided into four subgroups: (1) controlled hypertension with normal volume (CHT-NV), (2) controlled hypertension with high volume (CHT-HV), (3) uncontrolled hypertension with normal volume (UHT-NV), and (4) uncontrolled hypertension with high volume (UHT-HV). AEA was measured by ultra performance liquid chromatography-tandem mass spectrometry. AEA was significantly higher in the HV group as compared with the NV group (P?<?0.05). In addition, AEA was also significantly higher in the CHT-HV group as compared with the UHT-NV group (P?<?0.05). These results may suggest a compensatory function of AEA and TRPV1 pathway to lower blood pressure during volume expansion in CAPD patients.     

华南地区某眼科医院的感染性角膜炎病原菌谱特征

目的 探讨华南地区某眼科医院感染性角膜炎的病原菌谱及其特点。方法 回顾性系列病例研究。选择2013年7月1日至2017年12月31日在中山大学中山眼科中心进行角膜取材和微生物检测的角膜感染患者3 914例。表面麻醉后刮取病灶边缘的病灶组织,进行细菌、真菌培养及鉴定。培养结果阳性的细菌采用生化比色或质谱进行种属鉴定;真菌依据形态学进行种属鉴定。各季节菌谱阳性率差异比较采用卡方检验。结果 感染性角膜炎患者中,男2 468例（63.1%）,女1 446例（36.9%）,年龄（49.5±16.8）岁。病原菌培养阳性的患者共1 673例（42.7%）,其中单纯细菌749例（44.8%）,单纯真菌849例（50.7%）,混合感染75例（4.5%）。最常见的细菌是葡萄球菌属（20.1%）,其次是假单胞菌属（7.5%）;最常见的真菌是镰刀菌属（25.5%）,其次是曲霉菌属（10.3%）。细菌的阳性率在5-8月明显高于1-2月和9-12月（P<0.05）,真菌的阳性率在5-6月明显低于1-2月和9-12月（P<0.05）。结论 在华南地区一所三甲眼科医院的感染性角膜炎中,真菌感染略高于细菌感染,且细菌和真菌感染存在季节性差异。     

Membrane technology for optimizing process optimization of small bioactive compounds in Mailuoning Injection factory effluene北大核心CSCD

Objective: To enrich small bioactive compounds from Mailuoning Injection factory effluene by polyether sulfoxide hollow fiber membrane. Methods: The retention rate of the common polymer (protein, tannin, starch, and pectin) and the permeability of the small molecule pharmacodynamic substance chlorogenic acid were the indicators, and the stop time and membrane type in ultrafiltration process were optimized. The temperature, pressure, and feed rate were investigated to determine the influence degree of each factor on the permeability and retention rate, and then the optimum process parameters of the ultrafiltration membrane process were optimized by using Box-Behnken design-response surface method. Results: The sequence of common polymer retention rate from high to low is: the influencing factor A (temperature), B (pressure), C (feed rate), and there was a negative correlation with the temperature. For the chlorogenic acid transmission rate, the influencing factor A (temperature) was larger than B (pressure), and C (feed rate) was lowest. There was a “∩” relationship between chlorogenic acid permeability and pressure at a certain temperature and rate. The results of optimized process were as follows: liquid temperature was 35 ℃, feed rate was 262 mL/min, and membrane pressure was 15.0 psi (1 psi = 6.895 kPa). The chlorogenic acid transmission rate was (91.470 ± 0.988)%, and polymer retention rate was (80.080 ± 2.296)%. The comprehensive score was (85.780 ± 1.641)% and RSD was 0.46%. There was a small difference between the two processes. Conclusion: Hollow fiber membrane, which is a sustainable and green resource utilization, has a good permeability for small bioactive compounds in wastewater, and has excellent retaining effect on common macromolecules. © 2019, Editorial Office of Chinese Traditional and Herbal Drugs. All right reserved.