纳米SiO_2对poss复合树脂弯曲和抗压强度的影响

目的:观察纳米SiO2填料对纳米复合树脂poss的弯曲强度和抗压强度的影响,探究纳米SiO2的最佳添加比。方法:将经过硅烷偶联化的纳米SiO2颗粒加入poss复合树脂中,合成SiO2质量分数分别为0.5%,1%,1.5%和2%的SiO2/poss复合树脂,分别为BCDE四组,纯poss组为A组(对照组)。每组试件固定于万能材料测试机上,以1.0mm/min的速度垂直加压直至试样破坏,采用SPSS16.0软件对结果做单因素方差分析。结果:弯曲强度测试结果:C组最高,与其他四组均有统计学差异(P0.05);A、B、D三组无显著性差异,与E组差异明显(P0.05)。抗压强度测试结果:D组最高,与其他四组均有统计学差异(P0.05);B组和E组与A组差异显著(P0.05),与C组无显著差异。结论:纳米SiO2在一定范围内能够提高poss复合树脂的弯曲强度和抗压强度。     

电针不同穴位对慢性炎症痛模型大鼠心理行为改变的实验观察

目的：观察电针不同穴位对慢性炎症痛模型大鼠行为学改变的影响,进一步探讨电针对慢性痛所致心理行为改变的调节规律：方法：将40只雄性Wistar大鼠随机分为正常组、模型组、电针百会组、电针关元组、电针足三里组,每组各8只。除正常组外,其余各组均采用弗氏完全佐剂（CFA）制备佐剂性关节炎（AA,即慢性炎症痛）大鼠模型,于造模第2天各治疗组捆绑固定后给予电针20min,正常组及模型组捆绑束缚20min,隔日一次,共10次。于造模前、造模后、治疗5次、10次分别采用高架十字迷宫检测各组大鼠开放臂进入次数比例（OE％）及开放臂停留时间比例（OT％）的变化。结果：与造模前比较,电针百会穴组大鼠造模后0E％和0T％明显减少（P〈0．05,P〈0．05）,且治疗5次后OT％、治疗10次后0E％与0T％均降低明显（P〈0．01,P〈0．01,P〈0．05）,而电针关元组大鼠治疗10次后OE％和OT％则明显升高（P〈0．05,P〈0．05）,电针足三里组大鼠造模后0T％、治疗5次后大鼠OE％与OT％、治疗10次后OT％均明显降低（P〈O．01,P〈0．05,P〈0．01,P〈0．05）;与造模刚结束比较,电针百会组大鼠在治疗5次、10次后0E％由升高逐步降低,而OT％由低逐渐升高（P〉0．05）,电针关元组模型大鼠治疗10次后模型大鼠0E％和0T％均明显升高（P〈0．05,P〈0．05）,电针足三里组模型大鼠治疗10次后OT％升高明显（P〈0．05）;与治疗5次后比较,电针百会组大鼠在治疗10次后OE％降低、OT％升高（P〉O．05）,电针关元组与电针足三里组大鼠治疗10次后OE％和OT％均明显升高（P〈0．05,P〈0．05;P〈0．01,P〈0．01）。与电针百会组比较,电针关元组与电针足三里组大鼠在治疗10次时OE％均明显升高（P〈0．01,P〈0．01）结论：电针不同穴位具有一定抗抑郁和抗焦虑作用,可改善慢性炎症痛所致大鼠焦虑、情绪行为的变化;不同穴位效应不同,关元穴与足三里穴具有综合调节、抗焦虑效应,且具有相对特异性。     

乳杆菌制剂(定君生)和(或)甲硝唑三种方法治疗滴虫性阴道炎疗效比较

目的探讨滴虫性阴道炎的更佳治疗方法。方法2004年10月至2005年9月绍兴市妇幼保健院妇科门诊对92例滴虫性阴道炎病例随机分为A、B、C三组,A组31例,采用乳杆菌制剂0．25g塞阴道,每晚1次,共10d;B组31例．采用甲硝唑片0．2g口服,3次／d,共7d,同时用乳杆菌制剂塞阴道;C组30例,采用甲硝唑栓0．5g塞阴道,每晚1次,共10d,同时用甲硝唑片口服。结果停药3～5d的治愈率：A组67．74％、B组93．55％、C组93．33％;A组与B、C组之间差异有显著性（P〈0．05）,B组与C组间差异无显著性（P〉0．05）。停药3月的治愈率：A组41．93％、B组87．10％、C组56．67％,B组与A、C组间差异有非常显著性（P〈0．01）,有效率：A组54．84％、B组93．55％、C组70．00％,B组与A、C组间差异有显著性（P〈0．05）,A组与C组间治愈率及总有效率差异无显著性（P〈0．05）。结论甲硝唑片口服联合乳杆菌制剂（定君生）塞阴道是一种治疗滴虫性阴道炎的更佳方法,值得临床推广应用。     

C 阿霉素一纤维蛋白胶缓释化疗系统对S ,80 荷瘤小鼠的抑瘤实验研究

目的：探讨阿霉素-纤维蛋白胶缓释化疗系统对S180荷瘤小鼠的抗肿瘤作用。方法：建立S180荷瘤小鼠模型,将30只模型小鼠分为四组：A组10只,阿霉素以2／剂量局部注入肿瘤内部。B组10只,瘤内注入阿霉素．纤维蛋白胶缓释系统0．2ml（含阿霉素2／）。C组10只。瘤块内注入纤维蛋白胶0．2ml。D组10只,空白对照组。给药后每3天测量记录一次肿瘤大小,观辑各组平均肿瘤体积缩小情况。结果：A、B、C、D四组的肿瘤缩小比率分别为50％、100％、20％、10％,肿瘤抑制率分别为36．85％、77．42％、6．00％、6．52％,与空白对照D组相比。A、B组对S180肉瘤抑制作用明显（P〈0．01）,而B组的抑瘤作用明显强于A组（P〈0．05）．C组与D组无明显差异（P〈0．05）。结论：阿霉素-纤维蛋白胶缓释化疗系统以及阿霉素均能够有效的抑制S180荷瘤小鼠肿瘤的生长。前者的抑瘤作用更为明显,可能是一种安全可靠的新化疗方式．     

缬沙坦胶囊联合肾炎康复片治疗糖尿病微量蛋白尿的研究

目的：研究缬沙坦联合肾炎康复片治疗糖尿病微量蛋白尿的疗效及安全性。方法：采用随机、对照原则将60例有微量蛋白尿期糖尿病患者分为缬沙坦对照组（A组）和缬沙坦联合肾炎康复片治疗组（B组）,每组各30例。A组给予缬沙坦160mg,每日1次口服;B组给予肾炎康复片（薄膜衣片）每次5粒,每日3次口服和缬沙坦160mg,每日1次口服。疗程均为12w。比较2组治疗前、治疗第4、8和12w尿白蛋白排泄率（UAER）及治疗前、后肾功能、24h尿蛋白定量等生化指标的变化及肌酐50％倍增率。结果：2组治疗后血压、Scr、CRP指标均低于治疗前（P〈0．05）,而血FBG、PBG、HbAlc、Alb、BUN、24h尿蛋白定量指标变化无差异（P〉0．05）;B组治疗后与对照组比较,B组有较低Scr、CRP值（P〈0．05）,而余生化指标及血压变化无差异（P〉0．05）,B组第8、12w时尿蛋白排泄率下降幅度低于A组（P〈0．05）,B组治疗中12w的肌酐50％倍增率低于A组（P〈0．05）。结论：缬沙坦胶囊联合肾炎康复片治疗糖尿病微量蛋白尿是有效安全的。     

不同雌激素水平下大鼠颏舌肌肌电反应的研究

目的：通过比较不同雌激素水平下大鼠颏舌肌的肌电反应,探讨雌激素在预防及降低阻塞性睡眠呼吸暂停低通气综合征（OSAHS）发病过程中的作用机制。方法：选择30只6周龄SD大鼠建立不同雌激素水平模型,用电子称评估术前、术后和雌激素替代治疗后大鼠的体重变化;放射免疫法检测血清雌激素水平;电生理方法检测不同雌激素水平颏舌肌的肌电反应。结果：与假手术组（SHAM）相比,去势组（OVX）大鼠术后6周体重明显增加（P〈0．01）,雌激素替代治疗组（OVX＋E2）与SHAM组体重相当。血清雌激素检测结果显示OVX组雌激素水平最低,与SHAM组相比具有显著差异（P〈0．01）;OVX＋E2组雌激素水平高于OVX组（P〈0．01）,但仍未恢复到SHAM组水平。电生理检测结果显示,与SHAM组相比,OVX组颏舌肌肌电强度最低（P〈0．05）,OVX＋E2组颏舌肌的肌电强度显著高于OVX组（P〈0．05）,但仍低于SHAM组。结论：血清雌激素水平可以直接影响大鼠颏舌肌肌电强度．这可能是雌激素保护OSAHS的原因之一。     

单中心研究2型糖尿病合并高血压的相关危险因素

目的：探讨2型糖尿病合并高血压的相关危险因素。方法：186例2型糖尿病患者分为并发高血压组（A组136例）患者和正常血压组（B组50例）,对其进行问卷及体格检查,分别观察患者性别、年龄、病程、体重指数、腰围、腰臀围比（ⅦR）、高血压家族史、糖尿病家族史并加以分析。结果：A组患鼻上73．1％;两组间性别、年龄、病程差异无统计学意义（P〉O．05）,A组患者体重指数（BMI）、腰臀围比（WHR）、腰围、高血压家族史比例显著高于B组患者（P〈0．05-〈0．01）,B组糖尿病家族史比例显著高于A组（p〈0．05）。结论：高的BMI、腰围、腰臀围比（WHR）以及高血压家族史增加2型糖尿病合并高血压发生的危险。     

结直肠癌中Claudinl、ZEB-1和E-cadherin的表达及意义

目的探讨Claudinl、ZEB-1和E-cadherin在结直肠癌中的表达及三者之间的关系与临床病理的联系。方法免疫组织化学技术检测51例结直肠癌及癌旁组织中Claudinl、ZEB-1和E—cadherin蛋白的表达情况。结果在结直肠癌组织中Claudinl、ZEB-1、E—cadherin的表达率分别为68．6％、23．5％、56．9％,癌旁组织分别为37．3％、0、98．0％。三种蛋白在结直肠癌组织及癌旁组织中的表达差异均具有显著性（P〈O．01）。Claudinl及ZEB-1的表达率在III_IV期组（87．5％、41．7％）高于I-II期组（51．9％、7．4％;P〈0．01、P〈0．01）,有淋巴结转移组（90．9％、45．5％）高于无淋巴结转移组（51．7％、6,9％;P〈0．01、P〈0．01）,ZEB-1表达率在高级别组（42．1％）高于低级别组（12．5％;P〈0．05）。E—cadherin的表达率在I—II期组（74．1％）高于Ⅲ—IV期组（37．5％;P〈O．05）,无淋巴结转移组（72．4％）高于有淋巴结转移组（36．4％;P〈0．05）。Claudinl、ZEB-1与E-cadherin的表达均呈负相关（P〈0．05）,Claudinl与ZEB-1的表达呈正相关（P〈0．05）。结论Claudinl、ZEB-1和E-cadherin在结直肠癌发展,浸润和转移中起着重要作用,三者可能存在协同作用。     

某军校学员心理健康情况调查分析

目的：了解军校学员心理健康状况,为军校心理辅导工作提供理论依据,提高军校教育管理水平,有效预防学员在校期间由于压力、情绪等因素造成的心理问题。方法：使用DXC-6型多项群体心理测评仪,对某军校不同年级1332名学员进行卡特尔16种人格个性因素测验。结果：①1332名被测试学员16PF得分总体呈现”五高三低”。②不同年级的学员在16PF多项因子上得分有差异（P〈0．05）。研究生在C、M、O等因子得分明显高于大三学员,而在A、F、H等得分明显低于大三学员（P〈0．05）;研究生在C因子得分明显高于大四学员（P〈0．05）,F、G、Y2因子得分明显低于大四学员（P〈0．05）,而在A、M、O、H这些因子的得分差异无统计学意义（P〉0．05）;大三学员在A、H、X2等得分明显高于大四学员,而在M、O、Q1等得分明显低于大四学员（P〈0．05）。结论：军校学员的整体心理健康水平良好;本科学员（尤其是大三学员）的心理健康水平明显优于研究生;大三的学员在乐群性、敢为性、实验性、忧虑性等方面优于大四学员,和大四学员相比,大三学员更喜欢探索新生事物。     

呼吸道合胞病毒感染促进豚鼠产生气道高反应性及其机制研究

目的：通过检测气道反应性和M2受体功能,研究呼吸道合胞病毒（RSV）感染与哮喘发病的关系及机制。方法：34只豚鼠随机分为4组：Hep-2滴鼻＋生理盐水雾化（Hep-2／NS,A）组,RSV滴鼻＋生理盐水雾化（RSV／NS,B）组,Hep-2滴鼻＋鸡卵蛋白（OVA）雾化（Hep-2／OVA,C）组和RSV滴鼻＋OVA雾化（RSV／OVA,D）组,其中A和B纽各9只,C和D组各8只,以A组为对照组。21d通过电刺激迷走神经检测各组气道反应性和M2受体功能,行嗜酸性粒细胞计数以及病理学观察。结果：B组气道内压力（mmH2O）与A组无明显差异（P〉0．05）,给予匹罗卡品,IP下降幅度高于A组,但差别无显著性（P〉0．05）。C组IP明显高于A且（P〈0．05）,且给予匹罗卡品,IP下降幅度明显低于A组,差别有显著性（P〈0．05）。D组IP明显高于C组（P〈0．05）,给予匹罗卡品后IP下降幅度明显低于C组（P〈0．05）。结论：RSV感染可促进过敏原引起的M2R功能障碍,从而促进AHR发生。     

Effect of disinfection and storage on the flexural strength of ocular prosthetic acrylic resins

doi: 10.1111/j.1741‐2358.2011.00570.x Effect of disinfection and storage on the flexural strength of ocular prosthetic acrylic resins Objective: To evaluate the influence of chemical disinfection and storage duration on the flexural strength of acrylic resins commonly used to make ocular prostheses. Methods: A total of 260 samples were manufactured with N1 resin and colourless resin. Both resins were thermopolymerised using a microwave oven. Samples were stored and periodically disinfected and were divided into groups: control (no disinfection) (I), neutral soap (II), Opti‐free (III), Efferdent (IV), 1% hypochlorite (V) or 4% chlorhexidine (VI). The flexural strength was measured before and after 60 and 120 days of storage. Data were analysed by anova and Tukey test (0.05). Results: The flexural strength of the N1 resin was higher than that for the colourless resin. There was a significant difference in the flexural strength before and after 60 and 120 days of storage with disinfection, regardless of the resin and disinfectant. Group I in the initial period exhibited greater flexural strength, with significant difference only in group VI after 120 days. Conclusion: It can be concluded that the flexural strength only changed after 120 days of storage for samples disinfected with chlorhexidine. However, all flexural strength values obtained herein were acceptable clinical limits for the acrylic resins.     

Nanoreinforcement of poly(propylene fumarate)-based networks with surface modified alumoxane nanoparticles for bone tissue engineering

A novel composite material has been fabricated for bone tissue engineering scaffolds utilizing the biodegradable polymer poly(propylene fumarate)/poly(propylene fumarate)-diacrylate (PPF/PPF-DA) and surface-modified carboxylate alumoxane nanoparticles. Various surface-modified nanoparticles were added to the polymer including a surfactant alumoxane, an activated alumoxane, a mixed alumoxane containing both activated and surfactant groups, and a hybrid alumoxane containing both groups within the same substituent. These nanocomposites, as well as polymer resin and unmodified boehmite composites, underwent flexural and compressive mechanical testing and were examined using electron microscopy. Hybrid alumoxane nanoparticles dispersed in PPF/PPF-DA exhibited over a 3-fold increase in flexural modulus at 1 wt % loading compared to polymer resin alone. No significant loss of flexural or compressive strength was observed with increased loading of hybrid alumoxane nanoparticles. These dramatic improvements in flexural properties may be attributed to the fine dispersion of nanoparticles into the polymer and increased covalent interaction between polymer chains and surface modifications of nanoparticles.     

Evaluation of the flexural strength and elastic modulus of resins used for temporary restorations reinforced with particulate glass fibre

doi: 10.1111/j.1741‐2358.2010.00410.x
Evaluation of the flexural strength and elastic modulus of resins used for temporary restorations reinforced with particulate glass fibre Objective: The flexural strength and the elastic modulus of acrylic resins, Dencor, Duralay and Trim Plus II, were evaluated with and without the addition of silanised glass fibre. Materials and methods: To evaluate the flexural strength and elastic modulus, 60 test specimens were fabricated with the addition of 10% ground silanised glass fibres for the experimental group, and 60 without the incorporation of fibres, for the control group, with 20 test specimens being made of each commercial brand of resin (Dencor, Duralay and Trim Plus II) for the control group and experimental group. After the test specimens had been completed, the flexural strength and elastic modulus tests were performed in a universal testing device, using the three‐point bending test. For the specimens without fibres the One‐Way Analysis of Variance and the complementary Tukey test were used, and for those with fibres it was not normal, so that the non‐parametric Mann‐Whitney test was applied. Results: For the flexural strength test, there was no statistical difference (p > 0.05) between each commercial brand of resin without fibres [Duralay 84.32(±8.54), Trim plus 85.39(±6.74), Dencor 96.70(±6.52)] and with fibres (Duralay 87.18, Trim plus 88.33, Dencor 98.10). However, for the elastic modulus, there was statistical difference (p > 0.01) between each commercial brand of resin without fibres [Duralay 2380.64 (±168.60), Trim plus 2740.37(±311.74), Dencor 2595.42(±261.22)] and with fibres (Duralay 3750.42, Trim plus 3188.80, Dencor 3400.75). Conclusion: The result showed that the incorporation of fibre did not interfere in the flexural strength values, but it increased the values for the elastic modulus.     

预酸蚀乳牙牙本质对自酸蚀粘接系统粘接强度的影响

目的:探讨预酸蚀乳牙牙本质对自酸蚀粘接系统粘接强度的影响。方法:随机选取28颗健康乳磨牙,磨除颊舌面釉质,暴露牙本质粘接面,沿近远中向劈开形成56个样本,随机分为7组(n=8)。直接涂布组(A1组,A2组和A3组)分别涂布AdperTM Easy One(AEO),Xeno-V(XV)和OptiBond All In One(AIO)三种自酸蚀粘接剂,预酸蚀组(B1组,B2组和B3组)在涂布三种自酸蚀粘接剂前先使用35%磷酸酸蚀乳牙牙本质15 s,对照组(C组)使用Prime&Bond NTTM(NT)全酸蚀粘接剂,每个样本用Z350复合树脂堆砌成直径为3 mm的树脂小柱,通过剪切试验测试剪切粘接强度,并通过扫描电子显微镜观察断裂表面形态。结果:B1组,B2组的剪切粘接强度值明显高于A1组,A2组(P<0.001);B3组与A3组的剪切粘接强度值比较无明显差别(P=0.94)。A2组的剪切粘接强度值低于C组(P<0.05);B1组的剪切粘接强度值明显高于C组(P<0.001)。扫描电镜观察结果显示各组试件断裂面形态多为牙本质和复合树脂界面破坏。直接涂布组(A1组,A2组和A3组)断裂多发生在混合层的底部,树脂突较少且低于小管口。B1组和B2组试件断裂面可见多数牙本质小管被树脂突填满,断裂多发生在混合层的中上部。B3组试件断裂面可见牙本质小管空虚,树脂突较少。结论:预酸蚀乳牙牙本质可以提高AEO,XV两种自酸蚀粘接剂的剪切粘接强度。自酸蚀粘接剂处理乳牙牙本质可以达到全酸蚀粘接剂处理的粘接强度,但应用自酸蚀粘接剂前预酸蚀乳牙牙本质可以获得更高的粘接强度。     

Influence of surface treatments on the flexural strength of denture base repair

doi: 10.1111/j.1741‐2358.2011.00454.x Influence of surface treatments on the flexural strength of denture base repair Objective: The purpose of this study was to evaluate the flexural strength of repairs made with autopolymerising acrylic resin after different treatments of joint surfaces. Material and Methods: Fifty rectangular specimens were made with heat‐polymerised acrylic resin and 40 were repaired with autopolymerising acrylic resin following joint surface treatments: group 1 (intact specimens), group 2 (chemical treatment: wetting with methyl‐methacrylate for 180 s), group 3 (abraded with silicon carbide paper), group 4 (abraded and wetting with methyl‐methacrylate for 180 s) and group 5 (without surface treatment). The flexural strength was measured by a three‐point bending test using a universal testing machine with a 100 Kgf load cell in the centre of repair at 5 mm/min cross‐head speed. All data were analysed using one‐way anova and Tukey HSD test for multiple comparisons (p < 0.05). Results: Among repaired specimens, groups 2 and 4 had 66.53 ± 3.4 and 69.38 ± 1.8 MPa mean values and were similar. These groups had superior flexural strength than groups 3 and 5 that were similar and had 54.11 ± 3.4 and 51.24 ± 2.8 MPa mean values, respectively. Group 1 had a mean value of 108.30 ± 2.8 MPa being the highest result. Conclusion: It can be concluded that the treatment of the joint surfaces with methyl‐methacrylate increases the flexural strength of denture base repairs, although the strength is still lower than that observed for the intact denture base resin. Abrasion with sandpaper was not able to influence the flexural strength of repaired denture bases.     

Dual-curing resin cement with colour indicator for adhesively cemented restorations to dental tissues: Change of colour by curing and some physical properties

The study was aimed to investigate a color indicator containing dual curing resin composite luting cement and to plot the color change to the time of solidification of the cement. In addition some physical properties were studied. Specimens were made of a dual-cure resin cement (Maxcem Elite™ Chroma, Kerr, Orange, CA, USA) and polymerized by autopolymerization only, or with light initiated polymerization. A spectrophotometer was used to quantify the color change of the cement as plotted with the curing time. The efficacy of the curing process was studied by measuring water sorption and the ultimate flexural properties of the cement. The results showed that the flexural strength of cement after autopolymerization was 27.3 MPa and after light initiated polymerization 48.1 MPa. Young’s modulus of bending was 2089.3 MPa and 3781.5 MPa respectively for the same cement samples. Water sorption after two weeks for the autopolymerization cement samples was −1.12 wt% and for the light initiated polymerization samples 0.56 wt%. Non-parametric Spearman’s correlation was measured for autopolymerized cement samples between variables for color and solidification load (N), which showed a strong correlation between curing process and color change (p < 0.05). There was a correlation between the color change and degree of monomer conversion of the dual curing resin composite luting cement which contained a color indicator system for polymerization reaction. The study also suggested that autopolymerization only resulted in suboptimal polymerization of the cement. By additional light curing considerably higher flexural properties were obtained.     

Effect of the physical properties of acrylic resin of overnight immersion in sodium hypochlorite solution

doi:10.1111/j.1741‐2358.2009.00336.x
Effect of the physical properties of acrylic resin of overnight immersion in sodium hypochlorite solution Objectives: This study evaluated colour stability, surface roughness and flexural strength of microwave‐polymerised acrylic resin after overnight immersion in sodium hypochlorite, simulating 180 days use. Materials and methods: Forty disc‐shaped (15 mm × 4 mm) and 40 rectangular specimens (65 mm × 10 mm × 3 mm) were prepared from microwave‐polymerised acrylic resin. The specimens were immersed in 0.5, 1% sodium hypochlorite, Clorox/Calgon and distilled water. Colour measurements (ΔE) were determined by a portable colorimeter. A surface analyser was used to measure roughness (μm). The flexural strength (MPa) was measured using a three‐point bending test in a universal testing machine. Data were evaluated by one‐way anova , followed by Student–Newman–Keuls test (α = 0.05). Results: Statistical analysis found significantly higher colour changes (SNK, p < 0.001) for the 1% sodium hypochlorite, but mean ΔE value quantified by National Bureau of Standards was classified as slight. When comparing the surface roughness, no statistical significance was found among the solutions (anova , p = 0.637). The 1% sodium hypochlorite presented significantly lower flexural strength compared with the control group (SNK, p = 0.034). Conclusion: It was concluded that immersion in 1% sodium hypochlorite solutions for 8 h does influence the colour stability and flexural strength of microwave‐polymerised acrylic resin, during the simulated period of 180 days.     

Technological Parameters and Design of Bionic Integrated Honeycomb Plates

We investigated an integrated manufacturing method to develop lightweight composite materials. To design the preparation process for the integrated honeycomb plates, the shear and compressive mechanical properties of the corresponding composite materials were also investigated. The results indicate that these composite materials, with two types of resins reinforced by short basalt fibers, exhibit obvious toughness, particularly in their compressive properties. The Epoxy Resin （ER） is denser and has better bonding at the fiber and matrix interface than the vinyl ester resin matrix. Therefore, the ER exhibits better shear and compressive strengths than the vinyl ester resin matrix, thereby providing a design technology of the preparation process of the integrated honeycomb plate. The matrix material of this plate is composed of an epoxy （E51 ）, a curing agent （593）, and a thinner （501） at a ratio of 10：3：1; short basalt fibers are added as a reinforcing material at a 30% volume fraction. By increasing the curing temperature and other experimental conditions, we obtained an expected integrated honeycomb plate. This integrated honeycomb plate possesses properties such as a high fiber content, good shear and compressive performance, and high proc- essing efficiency.     

Flexural and bond strengths of relined denture polymers assessed by four‐point bending tests and Weibull analysis

doi: 10.1111/j.1741‐2358.2011.00515.x Flexural and bond strengths of relined denture polymers assessed by four‐point bending tests and Weibull analysis Objectives: The aim of this study was to (1) investigate the flexural strengths of three denture resins i.e. heat, photopolymerised and microwaved and how it was affected by relining with auto‐ and visible light–polymerised hard reliners, (2) investigate the bond strengths between denture resins and hard reliners and (3) interpret the results of both tests by utilising Weibull analysis. Materials and methods: Specimens (65 × 10 × 2.5 mm) from denture resins, relined and bonded combinations were tested using a four‐point bending test in a universal testing machine and a crosshead speed of 5 mm/min. Ten specimens for each bulk resin and denture resin–reliner combination for a total of 150 were tested. Results: Statistical analysis indicated significant differences between bulk materials (p < 0.001) and between reliners (p < 0.001) for flexural and bond strength tests. Conclusion: It was concluded that (1) the four‐point flexural strength was different between the denture base materials, (2) flexure strength between bulk and relined or between relined with autopolymerised and photopolymerised bases was different, (3) flexural strength among relined denture bases was different and (4) bond strengths among relined denture bases were different.     

放射性粒子^125I联合TACE治疗兔VX2肝肿瘤的实验研究

目的：通过研究不同活度的125I粒子以及联合TACE治疗兔VX2肝移植癌的疗效及其病理基础,探讨125I粒子组织间植入治疗肝癌的有效性。方法：建立兔VX2肝癌模型。60只肝癌模型兔随机分成5组,对照组（A组）植入空白剂量（0mCi）125I粒子,B组植入1.0mCi125I粒子,C组植入0.7mCi125I粒子,D组植入0.4mCi125I粒子,E组植入0.7mCi125I粒子＋TACE。观察植入前后各组肿瘤体积并计算抑瘤率,切除肿瘤组织及周围正常组织进行常规病理检查。结果：各治疗组肿瘤大小在治疗前后比较具有统计学差异（P〈0.01）,均小于同期对照组（A组）（P〈0.01）。在不同观察时期抑瘤率差别均有统计学意义（P〈0.05）,各个组间抑瘤率差异在治疗后2周最为明显（P〈0.01）,但均高于D组（P〈0.01）。治疗后6周病理提示D组部分组织内仍可见少量肿瘤细胞,而其余各治疗组均未见明显的肿瘤细胞残存,B组对周围肝组织损伤较大,C组、E组适中。总体疗效E组优于其余各治疗组。结论：125I粒子联合TACE治疗肝癌效果明显优于单一的治疗方案,是肝癌目前较为理想的治疗方案,其中单个粒子活度以0.7mCi左右较为适宜。