唾液对托槽-弓丝-结扎丝结构摩擦力的影响

目的 研究唾液对托槽-弓丝-结扎丝结构摩擦力的影响.方法 选择3种槽沟为0.56 mm×0.71 mm的不锈钢方丝弓托槽,与2种不锈钢丝(0.45 mm圆丝,0.43 mm×0.64 mm方丝)及2种结扎力(150 g和300 g)组合,每种托槽-弓丝-结扎组合分别在干燥和唾液环境中进行摩擦力实验,记录托槽与弓丝间滑动时的摩擦力.结果 各托槽-弓丝-结扎组合在唾液环境中的摩擦力较在干燥环境中大(P＜0.05).结论 在150 g和300 g结扎力下, 唾液增大了托槽-弓丝-结扎丝结构的摩擦力.     

远中移动尖牙的摩擦力测试

目的 测出远中移动尖牙时的摩擦力值及其公式.方法 用槽沟为0.022英寸×0.028英寸的不锈钢方丝弓托槽和0.016英寸澳大利亚弓丝组合,记录托槽与弓丝间相互滑动时示波器上显示的格数,再通过力值与格数间的换算关系,得出相应摩擦力公式.结果 远中移动尖牙的摩擦力值为(37.67±2.93)g.所得摩擦力公式为F ＝50/3h±G/6(h为示波器上的小格数,G为弓丝本身重量).结论 本实验的计算可知,远中移动尖牙时初始施力需为牙移动最适力值再加上所需克服40g左右的摩擦力值.     

托槽弓丝组合对托槽-弓丝-结扎丝结构摩擦力的影响

目的　研究不同托槽 -弓丝组合对托槽 -弓丝 -结扎丝结构摩擦力的影响。　方法　选择四种槽沟为0 .0 2 2× 0 .0 2 8″的不锈钢方丝弓托槽 (三种国产 ,一种进口 ) ,与四种不锈钢丝 (0 .4 5 mm与 0 .5 0 mm的国产圆丝、0 .0 17× 0 .0 2 5″与 0 .0 19× 0 .0 2 5″的进口方丝 )分别组合分组 ,记录托槽与弓丝间滑动时的摩擦力 ,结扎压力保持在15 0 g。　结果　国产托槽与国产圆丝组合时的摩擦力大于与进口方丝组合时的摩擦力 ,进口托槽与国产圆丝组合时的摩擦力小于与进口方丝组合时的摩擦力。　结论　在特定结扎压力下 (如 15 0 g) ,如果材质相同 ,托槽与弓丝的表面粗糙度相差越大 ,摩擦力越小 ,粗糙度越接近 ,摩擦力越大。     

唾液对Free-edge托槽摩擦力的影响

目的：研究唾液对Free-edge托槽摩擦力的影响。方法槽沟为0．56mm×0．71mm的Free-edge方丝弓托槽和直丝弓托槽与4种不锈钢丝（0．45mm和0．50mm圆丝,0．43mm＆#215;0．64mm和0．48mm×215;0．64mm方丝）及2种结扎方式（全翼结扎及中间翼结扎）组合,每种组合分别在干燥和唾液环境中进行摩擦力实验,记录托槽与弓丝间滑动时的摩擦力。结果在全翼结扎时,Free-edge方丝弓托槽和直丝弓托槽在唾液环境中的摩擦力显著高于在干燥环境中的摩擦力（P＜0．05）;在中间翼结扎时,Free-edge托槽在2种环境中的摩擦力无显著差别;Free-edge托槽结扎中间翼时的摩擦力显著低于结扎全翼时的摩擦力（P＜0．01）。结论唾液增加了Free-edge托槽在全翼结扎时的摩擦力。     

一种新型正畸摩擦力实验装置

托槽与弓丝间的相对滑动所产生的摩擦阻力是众多正畸学者所关注的问题。矫治力必须先克服摩擦力,才能作用于牙齿,使牙周组织发生反应直至牙齿移动[1]。如何控制摩擦力一直是学者们研究的热点所在[2]。     

不锈钢托槽与钴铬合金托槽摩擦力对比研究

目的 探讨不锈钢托槽与钴铬合金托槽对正畸摩擦力的影响.方法 在干燥条件下,按重复测量实验设计,各因素各水平完全组合,使用XF-Ⅰ型摩擦力测试仪,测试不同托槽-弓丝-结扎方式组合时在后牙段的动、静摩擦力.所得数据进行方差分析.结果 在托槽与所有不锈钢弓丝组合中,钴铬合金直丝托槽产生的动、静摩擦力大于其它3种传统不锈钢直丝托槽,而不锈钢托槽间的摩擦力差别不大;0.018英寸圆丝、0.020英寸圆丝、0.018英寸×0.025英寸方丝、0.019英寸×0.025英寸方丝的动、静摩擦力值依次增大;弹力橡皮圈结扎的动、静摩擦力及动、静摩擦力平均百分比均大于不锈钢结扎丝.结论 钴铬合金托槽不适合在滑动机制中应用;用0.019英寸×0.025英寸不锈钢方丝关闭间隙,应尽可能加强支抗控制;涉及托槽与弓丝间相对滑动时,不适合使用弹力橡皮圈这一结扎方式.     

唇侧自锁托槽矫正器的分类特点及临床应用

自锁托槽是一种最新的低摩擦力托槽,它利用托槽自身的自锁结构,替代或减少传统托槽中使用金属结扎丝或橡皮圈对弓丝的结扎,减少了结扎丝对弓丝的摩擦力,使矫治力更加柔和、持久,更容易产生牙齿移动,缩短操作时间,提高矫治效率。该文就自锁托槽的分类、特点及临床应用的最新研究进展作一综述。     

低角型错(牙合)自锁矫治技术的应用研究

目的:探讨自锁矫治技术在低角型错(牙合)患者中的应用.方法:对39例低角型错(牙合)患者分两组进行矫治.20例使用直丝弓托槽,滑动法关闭牙齿间隙,19例使用自锁托槽,滑动法关闭牙齿间隙.结果:总治疗时间自锁托槽组少于直丝托槽组,整平排齐阶段两组时间无明显差异,关闭间隙阶段自锁托槽组快于直丝托槽组.结论:使用自锁托槽相对...     

正畸矫治中摩擦力的研究进展

口腔摩擦学行为日益引起人们的重视,随着滑动机制在固定矫治中的普遍应用,托槽与弓丝相对运动产生的摩擦力在固定矫治中就显得尤为重要。摩擦力越大,牙移位的实际矫治力比例就越小,进而影响矫治器矫治的性能和效率。减小摩擦阻力可获得最有效的牙移位与最适当的生物组织反应,现就正畸治疗过程中摩擦力的研究进行综述。     

传动直丝弓技术在安氏Ⅰ类Ⅲ度牙列拥挤病例中的应用

传动直丝弓矫治技术是具有我国自主知识产权的新一代直丝弓矫治技术,在托槽设计上进行了一些创新性改进,兼顾了自锁托槽及Tip-Edge Plus托槽的优点,在正畸临床中有独到之处。本文通过比较其与正畸临床常用的滑动（MBT）直丝弓技术在牙列拥挤病例矫治中的差异,观察其临床应用优势。     

APPLICATION OF LORNOXICAM TO PATIENT-CONTROLLED ANALGESIA IN PATIENTS UNDERGOING ABDOMINAL SURGERIES

FOR anesthesiologis s ,treatingpostoperativepainhas alwaysbeen a problem.Althoughopioidshave been provedtobe effective,theirsideeffectscouldnotbeignored.With thedevelopmentofscienceand pharmacology,many drugs with aspectsof satisfactoryanalgesicefficacyand couldbe welltoleratedby patientshave been developed.And lornoxicamisone of them, which isa non-steroidalanti-inflammatorydrug (NSAID ), with analgesic, anti-infl-ammatory,andantipyreticproperties.Itseliminationhalf-time(3 to 5 hours) isle…     

Value of D-Dimers in patients with acute aortic dissection

Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P ＜ 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (＞0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P ＜0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P ＜ 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.     

Research of combined liver-kidney transplantation model in rats

Objective： To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods： SD rats served as both donors and recipients. 4℃ sodium lactate Ringer＇s was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava （IVC） inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results： Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion： This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.     

Development on Adjustable Calibration Marker for Shock Wave Focus

Shock wave lithotripsy （SWL） is a treatment of choice for upper urinary stones. However, this procedure is inappropriate for obese patients because the focus is often unable to reach the target owing to the limited focal distance in shock wave source. Although treating such patients in a blast path may increase the application length of shock wave source, it＇s difficult to find this path on the lithotripter monitor. For this reason, we invented an adjustable calibration marker in order to set an effective focus in the shock wave hath.     

Study on the TCM Pathogenesis of Angiopathic Complications of Type II Diabetes

Excess production of reactive oxygen species(ROS)of mitochondrion mediated by hyperglycemia is the common pathogenesis of angiopathic complications of diabetes.TCM holds that the damp from the dysfunction of spleen.kidney and liver is the causative factor of complications of diabetes.This is similar to the mechanism of Ros resulting in angiopathic complications of diabetes.When the angiopathic complications of type II diabetes mellitus(T2DM)are difierentiated as caused by turbid damp in TCM can be explained as ROS.Since the obstruction of pathogenic damp in channels and collaterals is said to be the main pathogenesis,the treating principle should be dissolving the damp to remove the obstruction.     

Leptin, Ghrelin and TNF-α before and after Hypo-caloric Traditional Chinese Diet and Auricular Acupuncture

INTRODUCTION Obesity is a complex emergent problem, which can be possibly solved not only by the diet but also by the life style and promotion of a constant physical exercise. 1, 2 No doubt careful attentions must be given to the nutritional condition of obese people, the dietary habits, the somatic build (i.e. distribution of fat mass) and the organic functions linked to formation of the fat mass. All the parameters should be constantly monitored before, during and after a diet treatment. 3, 4, 5     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P＜ 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P＜ 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.     

Relationship between Dysglycemia and Carotid Atherosclerosis in Tibetan Population

People with dysglycemia are at high risk for atherosclerotic diseases. This study aims at investigating the atherosclerotic vascular damage in dysglycemia and its metabolic origin in Tibetan population.     

Acupuncture Combined with Spinal Tui Na for Treatment of Primary Dysmenorrhea in 30 Cases

Objective: To observe the therapeutic effects in acupunture treatment of primary dysmenorrhea combined with spinal Tui Na, and study its mechanism. Methods: Thirty cases of the treatment group were treated by acupuncture combined with spinal Tui Na, and thirty cases in the control group were treated by routine acupuncture. Results: The total effective rate was 93.3% in the treatment group, and 73.3% in the control group, with a significant difference between the two groups (P<0.05). Conclusions: Acupuncture combined with spinal Tui Na has good prospects for treatment of primary dysmenorrhea.     

Luo Lingjie's Experience in Treating Chronic Nephropathy

In treating chronic nephropathy,Luo Lingjie,a chief physician,pays attention to regulating the balance between yin and yang,treating infection if present,and removing pathogenic factors.He prescribes gentle drugs and uses carefully strongly warming-tonifying ones,emphasizes the importance of persuading the patient to persist in treatment with medication and nurse one's health for recuperation,and is good at combined use of TCM and western medicine therapy and brings the merits of various therapies into full play,with obvious theraoeutic effects.