Polylactic acid (PLA) root replica in ridge maintenance after loss of a vertically fractured incisor

Abstract A periodontally affected tooth was prepared for a special treatment: Calcium hydroxide was introduced into the apical half of the root canal whereas its cervical part was filled with glass ionomer cement. The tooth was shortened subgingivally. After 6 weeks of epithelization over the residual root a palatal full-thickness flap was mobilized. The root was carefully extracted and chairside copy-milled from the biodegradable polylactic acid (PLA) material. The PLA-replica was implanted immediately into the socket and the flap was sutured. Aim of the treatment was to prevent the ridge collapse of the extraction area. Ridge height could be preserved during the 21 months of observation. With time the radiographic density of the cancellous bone increased in the implanted area, indicating that a PLA-replica is replaced by host's bone tissue.     

对神经根型颈椎病CT扫描的价值探讨

对50例神经根型颈椎病的CT征象进行了分析,并与X线平片加以比较。认为CT不仅在神经根型颈椎病的诊断中具有独特作用,而且在确定手术方法和手术途径的选择上也很有意义。作者认为在CT机还没有普及的情况下,摄一张良好的钩椎关节放大斜位片或椎间孔断层片对诊断神经根型颈椎病应是首选的。CT和X线平片相结合,综合分析,更有价值。     

染色体图象微机处理系统的应用

染色体图象处理系统具有7组67个功能，基本功能有视频处理、图象预处理、染色体配对和排序、图形功能、标注和批处理功能。把该系统应用于苯中毒工人遗传学生物标记研究、兰索拉唑对中国仓鼠肺细胞染色体畸变的影响研究、妇产科病人标本及猴外周血淋巴细胞标本的观察和分析的结果表明，该系统实用性强，并具有先进性、稳定性、灵活性和可拓展性等特点。     

基于系统输出分布的智能控制

提出了文题所述的控制策略,依据输出分布曲线的特征变量选取方法和依据该项信息的规则控制系统。仿真研究得到了满意的结果。在一个实验性二元精馏塔上用IBM-PC进行试验亦获成功。本法对具有非线性特性的分布参数对象,较常规控制策略有明显的优越性。     

The Process in Psychological Debriefings

Critical Incident Stress Debriefings have become an intervention method used in various cultures, countries and groups following critical incidents. Although the structure of such meetings has been adequately described, utilization of the group processes involved has received less attention. A model, process debriefing (PD), based on experiences from Europe, is presented. Some differences between the current CISD process in the United States and the Europe based model are outlined. Various factors that impact the process of debriefings are discussed with a special emphasis on leadership, and implications of these group process variables for psychological debriefing are presented. It is emphasized that the continued exploration and discussion of process issues is critical to advance the understanding of the critical elements of debriefing.     

早产儿血清表皮生长因子水平与脑发育相关研究

目的探讨早产儿血清表皮生长因子水平与脑发育的关系。方法依据入选标准观察对象为自2005年8月起连续收治入本院新生儿病房、出生24h内的胎龄为34周±3d的“正常”早产适于胎龄儿30例。采用酶联免疫吸附测定(ELISA)法,分别测定30例早产儿生后24h内和出生第8天空腹股静脉血清表皮生长因子(EGF)水平,分别为t0和t1值,计算血清EGF浓度变化的速率(Δt)。同时,在新生儿出生后6周(纠正胎龄接近40周)和纠正1月龄时进行NBNA评分测定。并将以上实验室数据与新生儿行为神经测定(NBNA)评分值及差值、早产儿出生后的头围增长值及增长速率进行Pearson相关分析。如果P值<0.05,则认为差有统计学意义。结果30例早产儿观察对象t0为(234.71±58.07)pg/ml,t1为(347.81±87.49)pg/ml,Δt为(16.16±9.94)(12.14、15.20)pg/ml/d;Pearson相关分析显示2次NBNA评分结果及差值、出生后6周和纠正1月龄时的头围增长值/增长速率与t0值无相关性(P>0.05);2次NBNA评分结果及差值、出生后6周和纠正1月龄时的头围增长值/增长速率与t1和Δt之间有相关性(P<0.05)。结论研究结果表明,早产儿出生后血清EGF浓度呈上升趋势,提示早产儿出生后体内EGF合成和释放增加,可能促进脏器成熟和组织修复;更重要的是,早产儿出生1周时高水平血清EGF浓度和/或较快上升速率者,其出生后头围增长速度也快,可能有较好的脑发育水平、远期预后良好。     

枢椎齿突骨折的治疗进展

枢椎齿突骨折是一种累及寰枢椎区稳定性的严重损伤 ,人们对它的认识是不断变化和深入的。近年来 ,出现了很多新的治疗观念和方法 ,作者对此作一综述     

盐酸伪麻黄碱生产工艺改革

目的：探讨新的盐酸伪麻黄碱生产工艺流程，解决产品质量问题。方法：在研究精制伪麻黄碱的基础上，由伪麻黄碱制备盐酸伪麻黄碱。确定合成条件，考察产品质量和产率。结果：新工艺盐酸伪麻黄碱具有良好稳定性，解决了产品结块问题，且较原工艺的产量有所提高。结论：在原生产工艺基础上的改革有生产应用价值。