多曲方丝弓矫治技术在直丝弓矫治器中的应用

目的：观察MEAW技术在直丝弓矫治器中矫治错[牙合]的临床效果,探讨其矫治特点。方法：选择0.022″系统的直丝弓矫治器,使用MEAW技术对10例Ⅲ类错[牙合]和3例前牙开[牙合]病例进行矫治。结果：13例患者均取得了满意的临床矫治效果。结论：在直丝弓矫治器中使用MEAW技术矫治错[牙合]效果明显,值得临床推广。     

钟状晚期牙胚和牙及牙周组织的特殊染色应用探讨

目的:探讨钟状晚期牙胚和成熟牙及牙周组织的特殊染色应用.方法:钟状晚期的人牙胚和成年大鼠的牙及牙周组织石蜡切片,用改良的Gomori和Mallory染色法染色,镜检染色结果.结果:改良Gomori染色,可将钟状晚期牙胚中的釉质基质与牙本质基质、牙及牙周组织中的硬组织与软组织、骨与软骨、染成2 种不同的颜色,便于识别和区分.各种组织结构和细胞形态清晰.结论:牙发育和牙及牙周组织教学科研切片,用改良的Gomori染色,利于观察研究,取得满意结果.     

姜黄素对口腔舌癌细胞增殖与转移能力影响的实验研究

目的 探讨姜黄素对口腔舌癌细胞增殖与转移能力的作用及其作用机制.方法分别以0、5、10、20、30、60、100μmol·L-1姜黄素处理人舌癌细胞SCC-4 24 h,采用MTT法、侵袭实验、流式细胞仪、免疫荧光显微镜分别检测姜黄素对口腔舌癌细胞增殖与转移能力的影响.然后,采用cDNA微陈列芯片技术筛选和实时定鼍RT...     

家兔创伤性面神经损伤的组织病理学研究

为了建立各种面神经损伤的实验动物模型，对６８只家兔１３６侧面神经颊面干分别造成暴露、牵拉、挤压、压榨及切断后吻合与不吻合６种损伤，于伤后不同时间取材，切片行Ｂｏｄｉａｎ及Ｗｅｉｌ染色，光镜下观察神经轴突、髓鞘、Ｓｃｈｗａｎｎ细胞及神经纤维周围结缔组织的变化。结果表明，暴露可造成神经Ⅰ度损伤；挤压、牵拉、压榨可造成Ⅱ～Ⅲ度损伤；神经断裂后不吻合者预后明显较吻合者差。神经受损后的病理改变，在中、重度损伤与神经电图变化相一致，而轻度损伤及严重损伤后期两者可能不一致。伤后１５天为临床评价面神经功能恢复的最佳时间。神经受损面积对髓鞘病变影响明显，而损伤性质及程度对轴突病变影响明显。该动物模型的建立为深入进行面神经损伤及修复的研究提供了条件。     

Scanning electron microscopic and energy dispersive x-ray evaluation of two smear layer-mediated dentinal bonding agents

Teeth treated with smear layer-mediated dentinal bonding agents and restored with composite resin were examined at the dentin-restoration interface by means of scanning electron microscopy used in conjunction with energy dispersive x-ray analysis. Results indicated that these dentinal bonding agents actually bonded to the smear layer, and samples demonstrated delamination of the smear layer from underlying dentin following thermocycling. This finding suggests that the stresses developed within the composite resin exceeded the adhesive strength of the smear layer to dentin. Thus, the bond strength for dentinal bonding agents that require the presence of the smear layer cannot exceed the adhesion of the smear layer to dentin.     

阿替卡因与利多卡因在活髓牙预备时的疗效和对心血管系统的影响的比较

目的:比较阿替卡因(碧兰麻)与利多卡因在活髓牙预备时的麻醉效果和对心血管系统的影响。方法:随机数表将93例患者的138颗牙编号分组,以VAS(Visual Analogue Scale)标尺法由患者对疼痛程度进行打分;口腔医生评价麻醉效果,统计麻醉完全、良好、有效和失败的比例;观测患者在麻药使用前、即刻、3分钟、5分钟的血压和心跳。结果:两组的VAS评分存在显著性差异(P<0.01),麻醉完全、良好、有效和失败的比例也存在显著性差异(P<0.01)。两种麻药对血压心率均无显著性影响。结论:阿替卡因是一种有效的、安全的麻醉剂。     

A long-term study of 370 autotransplanted premolars. Part II. Tooth survival and pulp healing subsequent to transplantation

The purpose of the present investigation was to determine the long-term prognosis of autotransplanted premolars with respect to tooth survival and pulpal healing. The material consisted of 195 patients aged 7 to 35 years, with a total of 370 autotransplanted premolars with observation period ranged from 1 to 13 years. Teeth transplanted with incomplete and complete root formation showed 95 per cent and 98 per cent long-term survival respectively: Pulp healing as evaluated by sensibility testing and radiographic signs of partial pulp canal obliteration was usually verified 6 months after transplantation. The frequency of pulpal healing (versus pulp necrosis), appeared to be closely related to stage of root development at time of transplantation. Teeth transplanted with incomplete and complete root formation showed 96 per cent and 15 per cent pulp healing respectively. Another and associated factor which could equally well predict pulpal healing was the diameter of the apical foramen of the graft. Finally, in teeth with completed root formation, the use of bursa with internal cooling and no extra-alveolar storage prior to transplantation seemed to increase the chance for pulpal healing. The present study indicates, that the size of the apical foramen and possibly the avoidance of bacterial contamination during the surgical procedure are explanatory factors for pulpal healing.     

Immunohistochemical localization of CEA,EMA and keratin in salivary mucoepidermal carcinoma]

Localizations of CEA,EMA and keration in 19 cases of mucoepidermal carcinomas were investigated using the indirect immunoperoxidase technique.The results showed CEA was negative in normal salivary glands and showed faint reaction in glands near carcinoma tissue.Keratin and EMA were localized in some myoepithelial cells.The positive rates in carcinoma tissue were 78.9%,89.5% and 84.2%,respectively.The positive rates and staining intensity of CEA and EMA in carcinoma tissue gradually decreased with the decline of tumor differentitation,but that of keratin showed no variation.the author consider that CEA and EMA could become good indices in clinically diagnosing mucoepithelial carcinoma and determining tumor differentiation type cell in mucoepidermal carcinoma and have a potential to multiply express the tumor elements of epithelium and/or mesenchyma.     

Biological Mechanism of Specific Relationship between Gan (Liver) Meridian of Foot-Jueyin and Genitals

From the perspective view of Chinese medicine, the Gan (Liver) meridian of Foot-Jueyin starts from the great toe, running upward along the medial side of the thigh to the perineal area, where it curves around the external genitalia and goes up to the lower abdomen. In clinical practice, acupoints in the feet of the Gan meridian of Foot-Jueyin are used to treat the genitourinary and external genitalia diseases. Studies have shown that reproductive system diseases have specific pathological reactions in the places (radial side of tibia and foot) where Gan meridian of Foot-Jueyin passes by. Why does this happen? In this article, we begin by briefly reviewing the evidences linking foot and genitalia. We then explore the potential mechanism of the relationship between genitals and the Gan meridian of Foot-Jueyin. The brain cerebral cortex is characterized by cortical interactions. Numerous studies show that different cerebral cortex function areas (especially the adjacent areas) are overlapping and interact with each other. Finally, we presume that there is a specific connection between the feet and the genitals. Physiologically in the cortical homunculus, the genital area lies adjacent or overlapped to the foot areas, the two areas may interact with each other. The functional reorganization between different areas of the cerebral cortex under pathological conditions may be the underlying mechanism of the relationship between the feet and the genitals.