体外诱导培养大鼠牙乳头细胞碱性磷酸酶和Ⅰ型胶原的表达

目的:观察体外诱导培养的大鼠牙乳头细胞碱性磷酸酶和I型胶原蛋白合成的变化。方法:原代培养法获得大鼠牙乳头细胞,在条件培养基中进行诱导培养,在不同时间进行钙结节染色,ALP染色和定量测定,ELISA法和RT-PCR法测定细胞I型胶原蛋白的量和mRNA表达水平。结果:体外诱导培养的大鼠牙乳头细胞形成含钙化物的细胞结节,体外培养至12d的诱导组细胞ALP高于对照组(P<0.05),细胞内I型胶原表达量高于对照组(P<0.05),且I型胶原mRNA表达水平上调(P<0.05);培养15d后诱导组细胞分泌的I型胶原高于对照组(P<0.05)。结论:大鼠牙乳头细胞在体外分化的过程中碱性磷酸酶活性明显增高,矿化能力增强,并不断合成和分泌I型胶原形成胞外基质。     

外周疼痛模型大鼠脊髓背角环氧化酶表达时程的研究

目的 探讨环氧化酶参与疼痛过程的特点,从而为揭示疼痛的中枢机制提供线索.方法 选取雄性Sprague-Dawley大鼠50只,20只大鼠右侧后肢足掌皮下注射生理盐水100μl作为对照组.30只大鼠右侧后肢足掌皮下注射5%(体积分数)福尔马林液100μl作为实验组,注射后2、6 h和1、3、7、14天作为测试时间点,每个时间点随机选取5只大鼠,断头后取大鼠脊髓腰膨大部位1 cm(L4～5)组织并分离出背角部分,以免疫印迹法检测不司时间点环氧化酶1和环氧化酶2蛋白的表达.结果 福尔马林注射后大鼠脊髓环氧化酶1表达在注射后1 d开始增多,达到对照组的(2.44±0.43)倍,持续到14 d表达仍明显增多,达对照组的(3.30±0.39)倍.环氧化酶2的表达仪在注射后2 h表达明显增多,达对照组的(1.87±0.34)倍,注射后6 h即恢复到正常,观察到第14天仍然没有变化.结论 环氧化酶1和2可能都参与疼痛的中枢机制,环氧化酶2在疼痛的早期或发生中起作用,而环氧化酶1可能参与疼痛的维持.

Abstract：

Objective To compare the expression of two cyclooxygenase (COX) isoforms (COX-1 and COX-2) in the spinal cord of rats with inflammatory pain following peripheral formalin injection. Methods Experiments were performed on adult male Sprague-Dawley rats. 100μl of 5% formalin were injected subcutaneously into plantar hind paw of 30 rats to induce pain. The changes of COX-1 and COX-2 expression were evaluated by western blot in 30 rats, respectively at 2 hours, 6 hours, 1 day, 3 days, 7 days and 14 days after injection. The control group rats were injected with 100 μl of 0.9% saline instead of formalin in 20 rats. Results The expression of COX-1 significantly increased at 1day, 3 days, 7 days and 14 days, but the expression of COX-2 only transiently increased at 2 hours. Conclusions COX-1 and COX-2 are increasingly expressed in the spinal cord, furthermore,spinal COX-2 expression is induced early and transiently increased. COX-1 is up-regulated later and remains elevated for long time, which may explain the long-term hyperalgesia evoked by formalin injection.     

前牙反[牙合]与正常[牙合]自然舌姿势位的比较

目的通过比较前牙反[牙合]和正常殆在息止[牙合]位时舌的自然姿势特征,探讨前牙反[牙合]患者的舌位置是否有特征性变化。方法征集正常[牙合]志愿者20名（男8名,女12名,正常黯组）,平均年龄23．8岁;反[牙合]患者20名（男11名,女9名,前牙反[牙合]组）,平均年龄24．6岁。问诊调查舌的习惯姿势位,并用硫酸钡标记舌背中线和腭黏膜中线。拍摄头颅侧位片和息止[牙合]位侧位片,用t检验比较两组息止[牙合]位的舌位置。结果（1）正常[牙合]组整个舌背在硬腭、软腭处都与上腭完全贴合,舌尖置于上切牙舌隆突处;前牙反[牙合]组为舌背在软腭部有部分贴合,在部分软腭和硬腭区域远离上腭。舌体不易保持贴上腭位。（2）舌体的侧面轮廓在正常[牙合]组呈现向前上挺立,在前牙反[牙合]组表现为后下倾倒状。舌的最高点位置：正常组在硬腭与软腭交界区域;前牙反[牙合]组较正常殆组向下向后移位,在软腭与悬雍垂交界区域。（3）前牙反[牙合]组舌体位置（LP）比正常[牙合]组低（P〈0．01）;两组的舌高和舌长差异无统计学意义（P〉0．05）。结论息止[牙合]自然姿势位时前牙反[牙合]组较正常[牙合]组的舌位置低。     

核因子-κB受体活化因子配体和骨保护素在慢性根尖周炎病损中的表达及其与炎症浸润的关系研究

背景：核因子-κB受体活化因子配体（Receptor activator of NF-κB ligand,RANKL）和骨保护素（Osteoprotegerin,OPG）是近十年来发现的调节破骨细胞分化成熟和骨吸收功能的关键因子。本研究旨在探讨RANKL和OPG的表达及其与慢性根尖周病损的炎性浸润之间的关系。方法：采用免疫组化方法分别检测40例慢性根尖周炎病损中的RANKL、OPG表达和T淋巴细胞、B淋巴细胞和巨噬细胞的表达。并对病损组织的炎症程度和三种炎症细胞表达水平分别分级。结果：轻、重度炎性浸润二组间的RANKL表达差异有统计学意义（P＜0.05）。T,B淋巴细胞和巨噬细胞的各自不同表达分级各组中的RANKL的表达差异有统计学意义（P＜0.05）。RANKL/OPG比率和炎症细胞浸润无关。结论：RANKL的表达水平和慢性根尖周炎的免疫炎性反应关系密切,RANKL在慢性根尖周炎疾病进展中发挥了重要的作用。     

长春市138名7～12岁儿童口腔牙周健康状态调查

目的:了解长春市小学7～12岁儿童牙周疾病患病状态及4种牙周致病菌检出情况,为进一步大规模系统的儿童口腔疾病调查提供依据.方法:以上颌第一磨牙颊面为被检部位,记录探诊后出血(bleeding on probing,BOP)联邦、探诊深度(probing depth,PD)后,判断牙龈指数(gingival index,...     

基于聚多巴胺的材料表面修饰对二磷酸腺苷促血小板聚集功能的影响

目的:采用基于聚多巴胺的表面改性方法,将具有促血小板聚集作用的二磷酸腺苷接枝到材料表面,构建一种具有促进血小板黏附、聚集与激活表面.方法:通过聚多巴胺偶联作用将二磷酸腺苷接枝到细胞爬片表面(G-ADP组),另设两个对照组分别为多巴胺涂层细胞爬片表面(G-DA组)和细胞爬片表面(G组).通过X射线光电子能谱分析材料表面化学元素;在材料表面培养人骨髓间充质干细胞,检测1、3、5天细胞增殖情况;通过场发射扫描电镜、乳酸脱氢酶定量实验和免疫荧光标记实验测定材料表面血小板黏附、聚集与激活情况.结果:G-ADP表面出现P峰,表明二磷酸腺苷接枝到材料表面;三组材料表面培养细胞均呈增殖状态,且三组之间差异无统计学意义P＞0.05.电镜下观察G-ADP表面黏附大量血小板,聚集成簇,伸出伪足并且相互融合,而对照组仅有少量血小板黏附;定量实验显示G-ADP表面血小板黏附量高于其它两组;G-ADP表面CD41-FITC和CD62P-PE两种抗体的荧光强度均显著高于其它两组.结论:二磷酸腺苷可成功接枝到材料表面,功能化修饰表面可促进血小板黏附、聚集与激活,且具有良好的生物相容性.     

174例冠状动脉旁路移植术后患者心电监护下拔牙的临床观察

目的:评估拔牙手术对冠状动脉旁路移植(CABG)术后患者心血管系统的影响。方法:174例冠状动脉旁路移植术后患者复方阿替卡因注射液(必兰)局部麻醉,心电监护下拔除患牙,记录静息状态下(T0)、麻药注射过程中(T1)、麻药注射后5min(T2)、拔牙术中(T3)及拔牙术后5min(T4)收缩压、舒张压、心率等血流动力学参数、心电图变化和患者症状体征,计算心率一收缩压乘积(RPP)和平均动脉压心率商(PRQ)。结果:160例患者完成拔牙手术,14例患者因收缩压持续升高、频发室性早搏、心绞痛等原因终止拔牙手术。结论:大多数基础病变控制良好的CABG术后患者可以在心电监护下完成拔牙手术。     

长春市某小学7～12岁儿童福赛斯坦氏菌和中间普氏菌分布状态调查

Objective To detect the presence of Tannerella forsythus(Tf)and Prevotella intermedia (Pi) using polymerase chain reaction(PCR) in the oral plaque samples from children and investigate the relationship between bacteria and clinical parameters. Methods A total of 151 children aged 7 to 12 years were selected from Changchun primary school. The supragingival plaque sample was collected from the mesiobuccal and labial surfaces of the right maxillary central incisor ( FDI 1 ) and the right maxillary first molar ( FDI 6 ). Extracted DNA from plaque samples was used for PCR analysis. Intraoral examination,probing depth (PD) and bleeding on probing (BOP) were performed and recorded. Results The detection rate for Tf was 40. 3% ( 118/293 ) and Pi was 46. 4% ( 136/293 ) in supragingival plaque. The detection rates for Tf and Pi in molars were much higher than those in incisors( P ＜0. 01 ). The detection rate of Tf and Pi was positively related to BOP + and PD. The detection rate for Pi decreased gradually with age, and the detection rate for Tf was highest in the group aged 7 to 8 and the detection rates for Tf and Pi were higher in the gingiva with BOP + than that with BOP - ( P ＞ 0. 05 ). The detection rates for Tf increased remarkably with BOP + and especially when PD was greater than 4 mm. Conclusions Detection rates of putative periodontal pathogens from healthy children of 7 to 12 years of age were high. The detection rates for Tf and Pi in molars were much higher than those in incisors, and the presence of Tf and Pi in supragingival plaque was related to periodontal parameters.     

人工心脏瓣膜置换术患者牙拔除术的临床研究

目的观察116例（170颗牙齿）心脏瓣膜置换术后长期口服华法令的患者,在暂停抗凝药物与不停抗凝药物两种情况下,拔牙术中、术后的出血情况,探讨对该类患者安全的拔牙方法。方法对116例瓣膜置换术后口服华法令抗凝治疗的患者进行拔牙手术,根据患者有无华法令的停药史,分为停药组49例（68颗）,非停药组67例（102颗）。停药组术前停药3天,术后次日恢复用药,共拔除牙齿68颗;非停药组在不中止、不减量抗凝剂的情况下进行牙齿拔除术,术后常规拔牙创牙龈缝合,共拔除牙齿102颗。结果停药组44例患者共计61颗牙齿,非停药组61例患者共计93颗牙齿,术后均无明显出血,效果良好。停药组5例7颗牙齿、非停药组6例9颗牙齿,术后出血经局部再处理后,均达到良好止血效果。停药组与非停药组术后出血率无显著性差异。结论大多数长期口服华法令的患者拔牙时可不停药、不减量,均可获得良好效果。