下颌第一磨牙三维有限元模型的建立

目的：建立下颌第一磨牙三维有限元模型。方法：通过螺旋CT扫描的方法，利用Mimics、Geomagic Studio 7等图像处理软件，HyperMesh网格自动划分软件，通过特定的MSC．MARC有限元软件建立下颌第一磨牙三维有限元模型。结果：准确的建立了牙本质、牙釉质、髓腔、牙槽骨、牙周膜等组织形态的三维有限元模型。结论：本实验建模方法可行性强，方便快捷，具有良好的生物力学与几何力学相似性。为临床口腔医师提供了一种简捷而精确的有限元建模方法。     

颅颌面形态有限元分析系统的初步建立

初步建立一个用于颅颌面形态变化研究的有限元分析系统。方法：程序用ＢｏｒｌａｎｄＣ语言编写，对临床常用的Ｘ线头颅定位片进行分析，将呆分析的头颅定位片描在硫酸纸上，用图形数值化仪把节点输入计算机。根据有限元分析法的原理，将头颅定位片上的颅颌面结构份割许多三角形单元，用应变张量来描述颅颌面形态变化。     

建立模拟功能状态下的下颌骨三维有限元模型

本文在三维影像重建和三维有限元分析技术的基础上，建立了正常人和颞下颌关节疾病患者正中咬合时下颌骨的三维有限元模型。下颌骨螺旋ＣＴ和有限元模型三维重建影像的几何相似性良好，加载方式符合生理状况，比较真实地反映和模拟了功能状态下颞下颌关节与牙合的受力情况。为对颞下颌关节在各种状况下的生物力学行为进行分析和研究创造了条件。     

人正常下颌升支区应力分布的三维有限元法分析

目的：对正常人下颌升支在不同咀嚼力作用时应力分布情况进行三维有限元分析。方法：采用三维有限元应力分析的方法，对正常离体人下颌升支在不同加载条件下的应力分布特征进行对比定量分析。结果：(1)所有载荷形式的各种应力值，随着单元距加载点的距离的增大，其应力值相对减小。(2)下颌骨下颌角、升支后缘的应力梯度变化较大。结论：下颌骨下颌角、升支后缘是应力相对集中的区域，也是临床上常见的下颌骨骨折区，同时还是下颌升支矢状骨劈开术后加强固定以及防止骨段移位的区域。     

Personality dimensions of sexually transmitted disease repeaters assessed with the Millon Clinical Multiaxial Inventory

OBJECTIVE: To assess the personality characteristics of patients with repeated sexually transmitted diseases (STD). METHOD: A case-control study comparing 101 STD repeaters (subjects with a lifetime history of three or more STDs) with 182 controls who had no history of STD. All subjects attended the City Department for Skin and Venereal Diseases in Belgrade (Yugoslavia) from June 1997 to April 1998. Personality characteristics was assessed by the Millon Clinical Multiaxial Inventory (MCMI). RESULTS: The analysis of MCMI test showed that STD repeaters had higher scores on narcissistic, antisocial and paranoid scales. The difference between STD repeaters and the controls was significant on antisocial, psychotic thinking and psychotic delusion scales, although scores on clinical syndromes were low for both cases and controls. Discriminant analysis showed that antisocial personality was predictive for STD repeaters. CONCLUSIONS: This study support the hypothesis that STD repeaters are different from controls in terms of their psychological characteristics. The behaviour of STD repeaters is ego-syntonic, which makes the treatment of their personality difficult and emphasizes the importance of work on primary and secondary prevention of STD.     

三种基牙材料对铸造玻璃瓷冠碎裂影响的研究

目的:研究不同种类和强度基牙材料与瓷冠破折碎裂的内在关系.方法:选用计算机建立上颌中切牙的三维有限元模型,模拟陶瓷层、牙本质、核桩等结构.分析在天然齿基牙、钴铬合金基牙及复合树脂基牙情况下,铸造玻璃陶瓷全冠的瓷层内及残余牙本质的应力分布情况.结果:高弹性模量的钴铬合金能够降低瓷层及残余牙本质内的最大主应力和最小主应力峰值,防止瓷层破折碎裂;而弹性模量与牙本质相近的复合树脂桩降低应力峰值的作用不明显.结论:对于有牙髓活力的牙本质基牙,尽量保存牙髓活力后行全冠修复.对于行根管治疗术后的无髓牙,进行核桩冠修复时,采用高弹性模量的高熔合金,尽量避免使用弹性模量较小的复合树脂核.     

FEMLAB对OCT在脑外科手术中应用可行性的仿真分析

光学相干层析技术是一种高分辨率成像方法。它是一种无损伤、非介入、非离子辐射的探测技术，具有较高的空间分辨率。有限元分析（FEA）是用于工程科学的重要工具，FEMLAB（Finite Element Modeling Laboratory）是基于偏微分方程的对科学和工程问题进行建模和仿真计算的交互式系统。本文简要介绍了OCT成像技术的原理及FEMLAB的应用步骤，重点用FEMLAB软件对脑组织内光场的分布情况进行分析，从而利用分析结果论证OCT成像在脑外科手术中应用的可行性。     

对CT所见腰椎间盘突出的重新鉴别与治疗观察

目的：因临床发现有些经ＣＴ检查有腰椎间盘突出的患者，其症状体征与ＣＴ结果不符。对１１２ＣＴ阳性者根据症状体征进行重新鉴别。方法：将ＣＴ阳性者根据“三种试验”分为阳性、阴性两组，再选压痛点作注射治疗。结果：两组治疗结果阴性组优良率较高。结论：ＣＴ结果可供参考，但不能作临床考虑的主要依据。对腰椎间盘突出症的诊断与治疗要以症状体征为主     

冠心病与血清微量元素变化的探讨

本文检测76例广州地区冠心病者血清10种微量元素(锌、锶、钼、锰、镁、铁、铜、铬、钡、硼)与健康人对照,结果显示冠心病者血清钼、镁、铜、铬、硼含量增高,其中铬、硼增高尤为显著。锌、锶、锰无显著差异。急性心肌梗塞组与其余冠心病组比较,10种微量元素血清水平均无显著性差异(P>0.05)。     

Gynandroblastoma of ovary with juvenile granulosa cell component and heterologous intestinal type glands

An ovarian gynandroblastoma in a 15-year-old girl is described. The predominant component was juvenile granulosa cell tumour. Areas of adult granulosa cell tumour and Sertoli cell elements were also present. Stromal theca and luteinised cells were identified. An additional histological finding was the presence of heterologous intestinal type glands. There was positive immunohistochemical staining of juvenile and adult granulosa cell areas with inhibin and MIC2 antibodies. Electronmicroscopy showed a close ultrastructural resemblance between tumour cells in granulosa and Sertoli cell areas, in spite of differences in architectural pattern, suggesting that both morphological components may derive from a single cell of origin. The tumour demonstrates a unique combination of elements which has not previously been described.