A study on the bond interface between low-fusing dental porcelain and pure titanium]

OBJECTIVE: To evaluate the bond interface between low fusing dental porcelain and pure titanium by observing the topography and detecting the ionic diffusion in the interface area. METHODS: The low fusing-porcelain La-porcelain produced by the authors or Vita Titankeramik porcelain was fused to the surfaces of pure titanium. The topography of the interface between pure titanium and porcelain, and the structure of experimental materials were observed with SEM. The state of ionic diffusion in the interface area was investigated with EPMA. RESULTS: Excellent permeation and diffusion of La-porcelain were observed on the surfaces of pure titanium. The diffusion of ions of stannum and silicon was discovered in the interface area. The microstructure of La-porcelain to pure titanium bond interface was finer than that of Vita Titankeramik porcelain. CONCLUSION: Excellent bond can be produced in the interface between La-porcelain and pure titanium. The bonding mechanism may involve mechanical bond and chemical bond. The ionic diffusion of stannum plays an important role in the bonding of porcelain to pure titanium.     

以"乳头溢液"为主诉的22例乳腺癌诊断及病理分析

目的 研究以“乳头溢液”为主诉的乳腺癌的诊断方法及其病理特征。方法 回顾性分析了22例以“乳头溢液”为主诉的乳腺癌的诊断方法，包括乳腺B超、乳腺X线、溢液涂片细胞学、乳管镜、术中冰冻切片检查及其病理特点。结果 乳腺B超、乳腺X线、术中冰冻切片的检出率分别为11．8％、20．0％、35．7％。溢液涂片细胞学检查3例发现癌细胞，6例高度怀疑癌细胞；6例患者行乳管镜检查，未提示乳腺癌。病理检查为原位癌9例，浸润性癌13例。雌激素受体（ER）、孕激素受体（PR）、Her-2阳性率分别为80．0％、86．7％、33．3％。结论 联合B超、乳腺X线、溢液涂片细胞学检查等手段可使乳腺癌的检出率有一定提高，对于有高危因素的患者仍应行乳腺导管切除活检。     

中、小面积深度烧伤符合功能与美学要求的皮肤移植术

目的:探讨非面颈部中、小面积深度烧伤更加符合人体皮肤功能与美学要求的皮肤移植技术.方法:受皮区创面采用浅切痂、削痂法,尽可能多保留创面正常皮下组织,严密止血.以低浓度肾上腺素生理盐水皮下注射肿胀供皮区,鼓式取皮机、电动切皮机或滚轴取皮刀切取厚0.2～0.6 mm大张中厚断层皮;游离皮片长轴垂直于受区纵轴不开洞移植.皮片与创缘、皮片与皮片3-0丝线严密缝合,妥善包扎、制动.结果:接受改进的皮肤移植术的患者共592例,受区面积为1%～30%[平均(11.2±2.7)%]TBSA.全部病例移植皮片成活率＞95%,移植皮片100%成活者91.9%(544/592),随访1 a以上评价,受区皮肤组织丰满,质地柔软、光滑,无明显增生性瘢痕,肢体关节活动自如,轻度色素沉着,供皮区表面较正常皮肤略粗糙,色素沉着不明显.结论:加强创面处理,改进和熟练掌握取皮技术,选择合适供区,中、小面积深度烧伤采用大张中厚和薄中厚断层皮不开洞移植,供皮区和修复部位均获得较理想的功能与美容效果.     

新形势下如何做好病案信息质量监控

通过对病案信息质量监控方法的透视，分析病案信息在新形势下的突显作用，探讨当前病案信息监控问题，提出当今做好病案信息质量的四级监控方法：自我监控、科室质控、院级监控及病案科质控，以确保病案信息质量。     

赖型钩端螺旋体Loa22重组质粒的蛋白表达和对巨噬细胞的毒性作用

目的对赖型钩端螺旋体Loa22基因进行表达和功能研究。方法构建赖型钩端螺旋体Loa22成熟肽重组质粒,经异丙基-β-D-硫代半乳糖苷(IPTG)对重组质粒进行蛋白诱导表达,SDS-PAGE和Western Blotting检测目标蛋白表达情况。经亲和层析获得目标蛋白并作用于小鼠巨噬细胞ANA-1,检测细胞上清液中乳酸脱氢酶(LDH)活力、四氮唑复合物(XTT)吸光度值和细胞凋亡率以评价其细胞毒性。结果成功构建Loa22成熟肽原核表达质粒,通过鉴定并纯化得到Loa22成熟肽,该蛋白使培养ANA-1细胞上清液中LDH活力升高,XTT吸光度值下降,细胞凋亡率增加。结论Loa22对ANA-1具有明显的毒性效性,该基因可能是致病钩体的一个重要毒力相关基因。     

Establishment of a sandwich ELISA method for detection of vascular endothelial growth factor in serum samples of hepatocellular carcinoma patients

Objective To establish a sandwich ELISA method for detecting vascular endothelial growth factor （VEGF） in sera of population and the patients with hepatocellular carcinoma （HCC）. Methods Full length and two truncated human VEGF cDNA sequences were amplified from a commercial plasmid pBLAST49-hVEGF by PCR and inserted into the prokaryotic-expression plasmid pET-32a or pGEX-2T. Various VEGF proteins were expressed and purified from E. coli in His-Trx or GST fusion forms. The specific VEGF antibodies were elicited in experimental rabbits and mice by immunization of the full length VEGF fusion protein His-Trx-VEGF1-165. After purification of antibodies with chromatograph of Protein G, a sandwich ELISA technique was established. Serum VEGF levels were evaluated in 229 adults and 291 HCC patients. Results SDS-PAGE displayed that the molecular weights of the expressed full length （His-Trx-VEGF1-165）, N-terminal （His-Trx-VEGF1-100） and C-terminal （GST-VEGF100-165） human VEGF fusion proteins were about 38KD, 31KD, and 33KD, respectively. Western blots confirmed that the prepared antisera were able to recognize both prokaryoticly and eukaryoticly expressed recombinant VEGF proteins. Assays of serially diluted His-Trx-VEGF1-100 by the established sandwich ELISA method showed that the linear range of the standard curve was 0.625-320 ng/mL, with the squared correlation coefficient R^2=0.991. Screening of a serum panel containing 291 serum samples of HCC patients and 229 health adults revealed that the average VEGF level in HCC patients was higher than that in healthy controls, with a statically significant difference. Conclusion The established sandwich ELISA reflects the level of serum VEGF and provide scientific basis for screening metastasis and recurrence of HCC using serum VEGF as an index.     

中国人Wilson病ATP7B基因启动子区的研究

目的研究中国人Wilson病（WD）ATP7B基因启动子区的序列和结构,发现存在的多态和突变情况。方法检测60例无亲缘关系的WD患者和20例正常人的基因组DNA序列并进行分析。结果（1）在正常对照和WD患者的启动子区-190位和-78位（转录起始点为＋1）均发现存在单个碱基的不同;（2）60例WD患者中,3例发现存在-504位G→C的突变,其中2例为纯合突变,1例为杂合突变,在正常对照中未发现此改变。（3）60例WD患者中,2例发现存在-782位A→G的突变,其中1例为纯合突变,另1例为杂合突变,在正常对照中未发现此改变。结论WD基因的转录直接受铜或其他重金属的调节。中国人WD基因启动子区序列存在的2个多态位点均位于已知的转录调控元件结构之外,提示核苷酸多态对启动子调控基因的表达不会产生影响。启动子区的突变也是WD的分子发病机制之一。提示WD基因的分子发病机制是多样又复杂。     

脊柱侧凸矫形钽氏棒内固定失败原因分析

目的：分析脊柱侧凸鲁氏棒矫形内固定术后内失败的原因,为今后应用鲁氏棒治疗脊柱侧凸提供有益的借鉴。方法回顾1989年1月至1999年3月收治的脊柱侧凸患者应用鲁氏棒矫形内固定者96例,其中由各种原因所致的内固定失败者15例。结果：分析造成内固定失败的原因为①术前软组织松解不充分;②矫形过程中拧紧内固定钢丝时用力不均匀;③内固定钢丝数量太少;④植骨的数量不足;⑤内固定的节段不正确;⑥下床活动太早。结论：应用鲁氏棒治疗脊柱侧凸仍然是一种行之有效的方法,但在术前准备、手术过程和术后处理时,应注意以上可能造成固定失败的因素。     

鼻咽癌古文献研究

按鼻咽癌临床表现特点确立古代鼻咽癌文献纳入标准,从古代文献中筛选出类似鼻咽癌的文献,并设立排弃标准除外有关颈淋巴结核、淋巴瘤等的内容。以此为基础,研究关于鼻咽癌的病因、病机及防治方法的古代鼻咽癌文献资料。结果显示,对鼻咽癌的病因病机有正气虚弱、寒客经络,或肝气郁结、火毒痰凝血瘀等几种认识;在防治上则强调预防为主,并以调理情志、益气和营为治疗大法。     

浅论何梦瑶《医碥》之脉学成就

《医碥》为清代医家何梦瑶的代表作,其卷五《切脉》篇详细论述了脉之部位,形体,行动,歇止,脉配四时五脏,脉之胃气及各脉主病,或举例,或说理,不仅文笔流畅,说理清楚,颇具文采,而且行文清晰明朗,形式精美。