中西医结合治疗152例胫腓骨骨折临床分析

目的探讨中西医结合分期治疗胫腓骨开放性骨折的临床疗效及观察并发症的发生率。方法对152例胫腓骨骨折患者采用分期治疗：Ⅰ期临时固定（伤后1~3d），Ⅱ期创伤修复（伤后3-20d），Ⅲ期最终固定（伤后3周后）。结果经过15个月的跟踪随访，胫腓骨骨折一期愈合135例，占88．81％；延迟愈合17例，占11.19％；骨不连发生率为0。并发症发生率：切口感染18例，占11．84％；胫骨钢板内固定者钢板外露6例，占3．95％，延迟愈合17例，占11．19％。结论中西医结合分期治疗胫腓骨开放性骨折能够提高骨折愈合率，减少并发症。     

磷石膏为原料制硬石膏的初步研究

将磷石膏在高温下煅烧成无水硬石膏,在合适的激发剂作用下,使之达到复合硅酸盐水泥质量要求,即制成地板石膏;煅烧温度在600℃所制无水石膏水泥强度最大。目前,硬石膏强度符合325#水泥国标要求,但防水性、耐磨性尚与普通水泥有差距。     

不同局部托盘制取藻酸盐印模后的石膏模型精确性研究

目的：对不同局部托盘及处理方式制取印模后的石膏模型尺寸精确性作一研究.方法：使用局部托盘制取一上颌标准模型的藻酸盐印模,灌注硬石膏模型.分别测量龈缘24近中边缘至27远中边缘（4个牙位）,24远中边缘至27近中边缘（2个牙位）的长度,再与标准模型相应位置的长度进行对比分析.实验根据选用局部托盘的材料不同,分为铝制局部托盘组和钢制局部托盘组;根据托盘边缘是否粘结医用胶布,分为铝制局部托盘胶布粘边组和钢制局部托盘胶布粘边组;根据模型硬固后的测量时间不同,分为1h组和12h组.每组重复6次,数据记录为均数±标准差,采用SPSS 17.0统计分析软件行t检验（α=0.05）.结果：当测量位置为24远中边缘-27近中边缘（2个牙位长度）时,标准模型-钢制托盘胶布粘边取灌模型间未见显著性差异（P=0.149）,其余取灌模型组与标准模型组间均可见显著性差异;当测量位置为24近中边缘-27远中边缘（4个牙位长度）时,所有的取灌模型组与标准模型组间可见显著性差异.此外,不同长度的印模制取,任一铝制托盘（胶布粘边）取灌模型组和任一钢制托盘（胶布粘边）取灌模型组之间未见显著性差异.分别测量硬固1h和12h的石膏模型并进行对比,未见显著性差异.结论：2牙位长度的藻酸盐印模制取,钢制托盘胶布粘边制取印模后灌注的硬石膏模型与实物的尺寸更相符;4牙位长度的藻酸盐印模制取,钢制托盘制取的印模和铝制托盘印模在精确性方面没有区别;无论制取2个或4个牙位长度的藻酸盐印模,托盘材料和是否粘边取灌注的硬石膏模型尺寸比较没有显著性差异.     

Comparative Evaluation of Dimensional Accuracy and Tensile Strength of a Type IV Gypsum Using Microwave and Air Drying Methods

To evaluate dimensional accuracy and tensile strength of a type IV gypsum product, at different time intervals, dried in air or a microwave oven. Eighty specimens prepared from a cylindrical mould were used for measuring tensile strength (group A). Twenty specimens from a master die mould were used for determining dimensional accuracy (group B). In group A, 40 specimens were dried in open air at room temperature (A1). The other 40 were removed after 30 min and air dried for 20 min. These were subjected to microwave oven drying for 5 min (A2). Ten specimens each were tested under diametral compression at each of the following time periods: 1, 2, 4 and 24 h after drying. In group B, ten specimens were dried in open air at room temperature (B1). Ten specimens were removed from the mould after 30 min and air dried for 20 min. These were then dried in a microwave oven for 5 min (B2). The data was statistically analyzed using students unpaired “t” test. At all time intervals, diametral tensile strength (DTS) values for specimens dried in microwave oven were significantly higher than for those dried in open air. There were no significant differences between the dimensional accuracy of the two groups. In this study, microwave oven drying had a positive effect on the DTS of a type IV gypsum and the microwave oven dried specimens were as accurate as the air dried specimens over the same time period.     

芎芷石膏汤治疗偏头痛32例观察

目的:探讨芎芷石膏汤加味对偏头痛的治疗作用。方法:选择近3年间的32例头痛病例,辨证属肝经风火者,采用芎芷石膏汤加味治疗。结果:芎芷石膏汤加味治疗偏头痛具有较好的疗效。     

A Review of Preweighed, Packaged Die Stone Versus Bulk Die Stone Use in a Dental School

Purpose This study compared the quantity of preweighed, packaged die stone use to bulk die stone use by dental students. Materials and Methods Starting in September 1994, all the bulk die stone was removed from the dental clinic, and only preweighed packages of die stone (Silky-Rock, Whip Mix) were available to students. At the end of August 1995 and August 1997, the amount of preweighed die stone used by the students was determined and compared with the amount of bulk die stone (DieKeen, Modern Materials) used during the period of September 1993 to August 1994. Results Between September 1994 and August 1997, the students used 42% less per annum of the preweighed, packaged die stone than the previous annual use of bulk die stone. The laboratories were much cleaner when the preweighed packages were used, and fewer cleaning staff were required. The environment was also cleaner for the laboratory staff, who used to fill the bulk containers with gypsum products. Conclusions Students used 42% less die stone per annum when using the preweighed packages.     

光学成像粉对全冠数字化模型精度的影响

目的研究Cerec inlab MC XL系统光学成像粉对数字化模型精度的影响。方法制备一标准右上第一磨牙全冠预备体模型,并复制8个石膏扫描代型。每个代型采用inEos扫描单元获取喷粉前后的数字化模型,采用inlab3.65软件测量每个数字化模型边缘、肩台、轴面、窝沟、牙尖区域喷粉前后的变化情况。最后采用SAS软件对实验数据进行统计分析。结果数字化模型各区域1周前后的测量值无统计学差异(P>0.05);喷粉后的数字化模型质量较喷粉前好,光学成像粉对数字化模型边缘、肩台、轴面、窝沟、牙尖区域的影响值分别为(0.073±0.042)、(0.106±0.077)、(0.044±0.025)、(0.128±0.060)、(0.102±0.056)mm,各区域影响值比较差异显著(P<0.01)。结论光学成像粉对全冠数字化模型各区域的影响是不同的,对面和肩台的影响大于边缘和轴面,提示不同区域喷粉时要区别对待。     

Mechanical Behavior of Plaster Composites Based on Rubber Particles from End-of-Life Tires Reinforced with Carbon Fibers

The principal objective of this research project is the disposal of end-of-life tire rubber waste and its incorporation in gypsum composites. As a continuation of previous projects, which established a reduction in the mechanical properties of the resulting products, the behavior of these composites is analyzed with the incorporation of carbon fibers. The density, Shore C hardness, flexural strength, compressive strength, dynamic modulus of elasticity, strength–strain curves, toughness and resistance values and microstructure of the material are studied and compared. The results obtained show a significant increase in the mechanical tensile strength of all of the samples containing fibers. The moduli of elasticity results show a decrease in rigidity and increase in toughness and resistance of the material produced by incorporating the fibers. An optimum dosage of a water/gypsum ratio of 0.6 and incorporation of 1.5% carbon fibers is proposed. This lightweight material, which offers a high mechanical performance, features characteristics which are suitable for large prefabricated building elements in the form of panels or boards.     

清咽六味散中石膏的含量测定

目的:建立清咽六味散中二水硫酸钙含量测定方法。方法:先将样品炭化后灰化,然后应用EDTA络合滴定法测定二水硫酸钙的含量。结果:对不同的清咽六味散样品进行二水硫酸钙的含量测定,平均回收率为101.33%,RSD 0.54%。结论:方法操作简便,可用于清咽六味散中二水硫酸钙的含量测定。