Expression of collagen and elastic fibers in duct-ligated submandibular glands of mice

Atrophy of salivary glands may occur by ductal obstruction caused by calculus, infection or neoplastic processes, or as consequence of systemic diseases and aging. In the present work, we have used histochemical methods to study the expression of elastic and collagen fibers during experimental atrophy of the submandibular gland of mice. Glandular atrophy was accompanied by a rapid increase in collagen deposition in both septal and intralobular regions. The expression of elastic fibers was not significantly altered during atrophy; a discrete increase of elastic fibers was noted only around ductal structures. The results showed that experimental ductal obstruction is a useful in vivo model to study molecular events that take part in the remodeling of the extracellular matrix during atrophy of salivary glands.     

暴露前牙龈下残根进行桩冠修复

本文综述了暴露前牙龈下残根进行桩冠修复的两种方法,即牵引法与牙冠延长术,并对两者进行了比较、总结,在临床上有指导意义。     

Influence of stretch-shortening cycle on mechanical behaviour of triceps surae during hopping

Belli , A. & Bosco, A. 1992. Influence of stretch-shortening cycle on mechanical behaviour of triceps surae during hopping. Acta Physiol Scand 144 , 401408. Received 20 March 1 991 , accepted 3 December 1991. ISSN 0001–6772. Laboratories of Physiology, Universities of St Etienne and Lyon, France and Departments of Biology and Physical Activity, University of Jyväskylä, Finland. Six subjects performed a first series of vertical plantar flexions and a second series of vertical rebounds, both involving muscle triceps surae exclusively. Vertical displacements, vertical forces and ankle angles were recorded during the entire work period of 60 seconds per series. In addition, expired gases were collected during the test and recovery for determination of the energy expenditure. Triceps surae was mechanically modelled with a contractile component and with an elastic component. Mechanical behaviour and work of the different muscle components were determined in both series. The net muscular efficiency calculated from the work performed by the centre of gravity was 17.5±3.0% (mean ± SD) in plantar flexions and 29.9 ± 4.8% in vertical rebounds. The net muscle efficiency calculated from the work performed by the contractile component was 17.4 %% 2.9% in plantar flexions and 16.1 ± 1.47; in vertical rebounds. These results suggest that the muscular efficiency differences do not reflect muscle contractile component efficiency but essentially the storage and recoil of elastic energy. This is supported by the relationship (P < 0.01) found in vertical rebounds between the extra work and the elastic component work. A detailed observation of the mechanical behaviour of muscle mechanical components showed that the strategy to maximize the elastic work depends also on the force-velocity characteristics of the movement and that the eccentric-concentric work of the contractile component does not always correspond respectively to the ankle extension-flexion.     

颈椎脱位的闭合复位

1985年5月～1996年3月,我们经治34例单纯颈椎脱位患者,30例行Crutchfield颅骨牵引闭合复位,20例成功,占66.6％。在成功组中,牵引重量最大为18kg,无一例出现神经损害加重。不全瘫均有不同程度恢复。尸体头颅标本测定,Crutchfield颅骨牵引承受的最大抗拨出力为60.3kg,在治疗颈椎脱位时,颅骨牵引是安全有效的闭合复位方法。     

An evaluation of the gum elastic bougie

This study was designed to evaluate the routine use of a gum elastic bougie for tracheal intubation. The median time to intubation with the gum elastic bougie while simulating an 'epiglottis only' view was only 10 s longer than the time taken during conventional intubation with an optimum view. Three of the patients required a gum elastic bougie-assisted intubation after attempts at conventional visual intubation had failed. There was no significant difference in the incidence of postoperative sore throat and hoarseness between the two groups. We recommend that anaesthetists should use the gum elastic bougie whenever a good view of the glottis is not immediately obtained.     

腰椎间盘突出症CT诊断与三维瞬间牵引

目的 :探讨腰椎间盘突出症的 CT表观及三维瞬间牵引的治疗效果。材料与方法 :回顾分析经 CT及临床诊断为腰椎间盘突出症病例 16 7例的临床及 CT资料。结果 :16 7例腰椎间盘突出症表现为单个或多个椎间盘的突出 ,硬脊膜囊、硬膜外间隙及神经根受压等征象。经三维瞬间牵引后 6 5例 (38.9% )症状有不同程度缓解 ,其中 94例 (5 6 .3% )症状完全消失。结论 :CT是腰椎间盘突出症的有效诊断手段之一     

老化皮肤的胶原与弹性组织变化研究

目的：探讨光曝露情况及年龄因素对皮肤中弹性组织、Ⅰ/Ⅲ型胶原及基底膜Ⅳ型胶原的影响,进而探索皱纹形成的组织学原因。方法：对80例取自不同年龄志愿者的曝光部位（眶周/前额、面颊）及非曝光部位（腹部/臀部）的皮肤组织进行HE染色、Weigert染色、苦味酸天狼猩红染色及免疫组化处理,采用显微形态观察和半定量分析。结果：各部位皮肤基底膜内Ⅳ型胶原的含量无差异;随着曝光时间增加,前额/眶周皮肤中Ⅰ型胶原减少率最大,弹性变性物质增加率最大。结论：前额/眶周皮肤的胶原显著减少和弹性变性物质明显增生,是该部位皮肤皱纹早发的重要原因。     

头环牵引外固定架治疗颈椎外伤的临床研究

[目的]探讨头环牵引外固定架治疗颈椎外伤的临床疗效。[方法]从1997年2月~2005年7月共收治129例颈椎外伤性骨折脱位患者。将129例病例随机分成2组,1组70例行头环牵引,其中31例头环牵引加背心带支架保守治疗,39例头环牵引加手术治疗(前路手术18例,后路手术17例,前后路联合手术4例);另1组59例行颅骨牵引,其中13例颅骨牵引加支具保守治疗,46例颅骨牵引加手术治疗(前路手术22例,后路手术20例,前后路联合手术4例)。[结果]随访6~48个月,平均12个月。头环牵引与颅骨牵引对上颈椎骨折脱位的复位作用无明显差异;对下颈椎骨折脱位的复位作用,统计学处理显示头环牵引组要明显好于颅骨牵引组,复位所需时间比颅骨牵引组短,完全复位率高,减压充分,更有利于脊髓功能恢复,治疗后离床时间头环牵引组要短于颅骨牵引组,2组患者治疗前后脊髓功能Frankel分级均有改善。[结论]头环牵引外固定架可改善复位功能,对颈椎的牵引固定作用较颅骨牵引更为坚强稳定,使用安全方便。     

复方硅橡胶对家兔输卵管上皮细胞内铜元素含量及超微结构的影响

本实验就复方硅橡胶栓堵剂（ＣＳＲ）对家兔输卵管上皮细胞趋微结构的影响进行了观察分析，并测定了上皮细胞内铜元素的含量变化，电镜观察表明：家充输卵管经复方硅橡胶栓堵后，其上皮细胞表面结构、细胞连接、细胞核等超微结构均未发生明显的形态改变：注药侧（右侧〕和对照侧（左侧）输卵管上皮细胞内虽有少数线粒体膨胀，但两组间无论在线粒体数目，膨胀线粒体百分率以及线粒体外膜比表面等方面均无差异（Ｐ＞０．１），电镜Ｘ—时线能谱分析表明：注药侧输卵管上皮细胞内铜元素的相对含量咯高于对照组，而且铜元素多畜集于线粒体内。     

不同状态人体牙槽骨的弹性性质

人体下颌牙槽骨皮质骨是各向异性复合生物材料,组织结构上类似于胶原羟磷灰石纤维增强的单向纤维增强复合材料。本文应用电测法测试了不同状态人体下颌牙槽骨皮质骨在平面应力状态下的各向异性弹性常数。