Effect of three investing materials on tooth movement during flasking procedure for complete denture construction

Problem statement

Tooth movement has been shown to occur during and after the processing of complete dentures. An understanding of this phenomenon may permit one to construct functional complete dentures that require less occlusal adjustment in the articulator and in the patient’s mouth.

Purpose

The purpose of this study was to examine the effects of three different investing methods on tooth movement occurring during the processing of simulated maxillary complete dentures.

Material and methods

Forty-five similar maxillary dentures were made using heat-polymerized acrylic resin, and assigned randomly to three experimental groups (n = 15 each) according to investing method: plaster–plaster–plaster (P–P–P), plaster–stone–stone (P-S-S), and plaster–mix (P–M). Specimens in all experimental groups were compression molded with denture base resin. Transverse interincisor (I–I) and intermolar (M–M) distances, and anteroposterior incisor–molar (LI–LM and RI–RM) distances, were measured with digital calipers at the wax denture stage (pre-polymerization) and after denture decasting (post-polymerization). Analysis of variance and Tukey’s test were used to compare the results.

Results

M–M, LI–LM, and RI–RM movement was significantly greater in the P–P–P group than in the P–S–S and P–M groups; no significant difference in I–I movement was observed among groups. Transverse movement along M–M and I–I was significantly greater than anteroposterior movement in the P–P–P group; no significant difference among measurements was observed in the other two groups.

Conclusion

The study results indicate that the use of dental stone or a 50:50 mixture of plaster and stone for investing of dentures is an important factor in efforts to control the magnitude of tooth movement.     

化瘀巴布膏体外透皮吸收研究

目的：研究促透皮吸收剂氮酮对化瘀巴布膏体外透皮吸收的影响。方法：采用改良Franz扩散池法，研究化瘀巴布膏中胡椒碱的体外透皮吸收特性，采用高效液相色谱法检测透过的胡椒碱，同时采用气相色谱法，以丁香酚为检测指标考察制剂稳定性。结果：经统计学分析，胡椒碱的体外渗透过程符合零级方程，并且试验过程中制剂基本稳定。结论：促透皮吸收剂氮酮可以促进药物的透皮吸收。     

切开复位T形钢板固定术治疗桡骨远端骨折的荟萃分析

目的比较切开复位T形钢板固定术与单纯手法复位石膏外固定治疗桡骨远端骨折的疗效差异,以期为临床上治疗桡骨远端骨折选择合适的治疗方案提供依据。方法按Cochrane系统评价的方法,计算机检索PubMed、Cochrane Library、EMBASE、Medline、CNKI、CBM、维普和万方数据库,同时手工检索中文骨外科期刊的相关文献,收集关于桡骨远端骨折经切开复位T形钢板固定术对比手法复位石膏外固定治疗的随机对照试验(RCT),检索时限均为建库至2012年1月31日。按纳入排除标准由两人独立进行RCT的筛选、资料提取和质量评价后,采用RevMan5.1软件进行荟萃分析。结果最终纳入3个符合要求的RCT研究,共171例患者。荟萃分析发现,与手法复位石膏外固定治疗相比,切开复位T形钢板固定术对改善桡骨轴向缩短长度更有效,两组差异有统计学意义(MD=-1.98,95%CI-3.12～0.84,P<0.05),对掌倾角的恢复无统计学意义(MD=1.69,95%CI-0.3～3.41,P=0.05)、对尺偏角的恢复无统计学意义(MD=-1.50,95%CI-5.47～2.47,P>0.05)。结论切开复位T形钢板固定术与单纯手法复位石膏外固定治疗桡骨远端骨折均能改善患者症状,临床疗效相似。但因原始研究质量均较低,影响结论的真实性,故建议临床医师参考,同时应该关注患者的要求及期望值。     

藤药贴膏剂治疗慢性盆腔炎临床效果观察

目的 探讨清热除湿、活血化瘀止痛的藤药巴布剂膏药外贴治疗慢性盆腔炎的临床效果.方法 将60例患者随机分为两组,贴膏组30例,给予藤药贴膏剂(艾叶、当归、红花、乳香、没药、羌活、独活、五加皮、桑寄生、续断等)外贴,每片贴膏剂贴下腹部24 h,每天1次;对照组30例,给予藤药(包药:即药物同贴膏组,用布袋包装)外敷,把包药隔水蒸热半小时以上敷下腹部,每日1次,两组均配合口服“盆炎灵”汤剂(金银花20g、蒲公英15g、柴胡10g、枳壳15g、赤芍15g、苍术12g、黄柏12g、薏苡仁24g、川牛膝24g、蒲黄20g、五灵脂15g、延胡索15g、川楝子10g、甘草5g)治疗,疗程3周,观察患者下腹部疼痛或刺痛;腰骶酸痛、肛门坠胀;白带;盆腔包块或积液;四组病例临床积分变化.结果 贴膏组患者痊愈22例(73.3％),显效5例(16.6％),有效2例(6.7％),无效1例(3.3％),总有效率为96.6％.对照组痊愈12例(40.0％),显效4例(13.3％),有效6例(20.3％),无效8例(26.6％),总有效率为73.3％,两组比较差异有统计学意义(P＜0.05).结论 清热除湿、活血化瘀止痛的藤药巴布剂膏药治疗慢性盆腔炎效果显著,是治疗慢性盆腔炎的有效方药(方药来自于经验方),值得临床推广.     

自制黄金膏外敷治疗丹毒43例疗效观察

目的观察黄金膏外敷治疗丹毒的临床疗效。方法将2008年6月-2011年6月我院丹毒患者86例随机分为治疗组（黄金膏外敷）和对照组（50%硫酸镁湿敷）,每组各43例。分别观察两组患者丹毒治疗情况。结果治疗组43例,显效38例,有效5例,总有效率为100.0%;对照组43例,显效26例,有效10例,无效7例,总有效率为83.7%,两组比较差异有统计学意义（P〈0.05）。两组治愈时间比较,治疗组平均治愈时间为（5.8±1.8）d,对照组平均治愈时间为（11.6±3.0）d,两组比较差异有统计学意义（P〈0.05）,治疗组疗程优于对照组。结论黄金膏外敷治疗丹毒可缩短治愈时间,疗效好,安全可靠。     

HPLC法测定消肿接骨贴中芍药苷

目的 建立消肿接骨贴中芍药苷测定的方法。方法 采用高效液相色谱法外标法测定。采用Thermo C18色谱柱（250 mm×4.6 mm,5 μm）;流动相：乙腈–0.1%磷酸（12∶88）;体积流量：1.0 mL/min;检测波长：230 nm;柱温：25 ℃;进样量10 μL。结果 芍药苷进样量在0.124 8～1.248 0 μg呈良好的线性关系（r＝0.999 8）,平均回收率为98.94%,RSD值为1.73%（n=6）。结论 本研究方法专属性强,灵敏度高,简便、准确、重现性好,可用于消肿接骨贴中芍药苷的测定。     

Short-term treatment with topical diclofenac epolamine plaster in patients with symptomatic knee osteoarthritis: pooled analysis of two randomised clinical studies

ABSTRACT

Background: Data from two randomised, double-blind, placebo-controlled studies were considered in order to investigate the efficacy and safety of a bio-adhesive plaster for topical administration containing diclofenac epolamine (DHEP) in patients with symptomatic knee osteoarthritis (OA).

Methods: Patients with radiologically confirmed symptomatic knee OA were included. The 14‐day treatment consisted of two daily applications of either DHEP or placebo plaster. The algofunctional Lequesne index and pain intensity, measured by means of the Huskisson's visual analogue scale (VAS), were considered as main efficacy parameters. The main analysis of the pooled data was by intention-to-treat.

Results: Of the 258 patients included, 235 completed the study. At the end of the study, the mean decrease in the Lequesne index was 35% in the DHEP group and 15% in the placebo group (?p < 0.0001). The mean decrease in pain intensity was 59.5% in the DHEP group and 29.9% in the placebo group. No interaction resulted between treatment and study effects (?p ≥ 0.2 whatever the test). The non-parametric Hodges–Lehmann estimator of the treatment effect resulted in a reduction of 21.9% for the Lequesne index and of 30.0% in pain intensity.

The number needed to treat (NNT) for at least a 50% reduction of pain was 3.0 and the effect size for pain was 0.75.

Conclusions: Topical application of DHEP plaster was shown to be an efficacious and safe short-term treatment for symptomatic knee OA, reducing pain and increasing physical function and may be similar in efficacy to oral non-steroidal anti-inflammatory drugs (as indicated by relative benefit data and NNT value).     

HPLC法测定止痛贴中补骨脂素和异补骨脂素的含量

目的建立高效液相色谱法测定止痛贴中补骨脂素、异补骨脂素的含量。方法色谱柱:PhenomenexGemini C18(4.6 mm×250 mm,5μm);流动相:乙腈-0.1%甲酸(35∶65);检测波长:246 nm;柱温:室温;流速:1.0mL.min-1。结果补骨脂素线性范围为0.081 3～0.487 7μg(r=0.999 9),平均回收率为99.85%(n=6),RSD为0.96%。异补骨脂素线性范围为0.081 6～0.489 6μg(r=0.999 9),平均回收率为101.25%(n=6),RSD为1.20%。结论方法稳定、可靠,可作为该制剂的质量控制方法。     

乳癖消巴布膏制备工艺

分析乳癖消巴布膏基质(黏着剂、软化剂、填充剂、保湿剂、渗透促进剂选择)、制备工艺(组成、制备、涂布)。乳癖消巴布膏,具有载药量大,保湿性能好的特点,且质量稳定,使用安全,符合标准和环保要求。     

正交试验优选雷公藤涂膜剂的基质组成

目的 优选雷公藤涂膜剂基质的组成和配比。方法 采用正交试验法,以外观质量、成膜时间为指标,确定基质中不同辅料的最佳配比。结果 以聚乙烯醇-124、CMC-Na、甘油比例为4∶1∶2制得的涂膜剂最稳定。结论 优选得到的配方设计合理,制备工艺简单,质量可控,可以为工业生产提供理论基础。