黄芩素对人牙周膜细胞增殖、RUNX2和BMP2表达的研究

目的探讨中药黄芩提取物黄芩素对人牙周膜细胞(hPDLCs)增殖和成骨基因RUNX2、BMP2表达的影响。方法原代培养hPDLCs,hPDLCs中分别加入浓度为1.25、2.50、5.00、10.00μmol/L的黄芩素作为实验组,空白组不加黄芩素。MTT法检测黄芩素对hPDLCs增殖的影响;试剂盒检测ALP的活性和表达;qRT-PCR研究黄芩素对hPDLCs RUNX2、BMP2表达的影响。结果较空白组,1.25~10.00μmol/L黄芩素作用于hPDLCs,其增殖活力略下降,但差异无统计学意义(P>0.05);黄芩素组ALP活性和表达上升(P<0.05),呈浓度依赖性;成骨相关基因RUNX2、BMP2 mRNA表达水平随时间延长,表达量持续上升,11 d上升最为显著(P<0.05),且10.00μmol/L黄芩素组显著高于其余浓度组(P<0.05)。结论黄芩素对hPDLCs骨向分化有促进作用,有可能作为牙周再生的选择之一。     

载辛伐他汀β-磷酸三钙支架复合脂肪干细胞修复兔颅骨缺损

目的：应用辛伐他汀(simvastatin)作用于脂肪干细胞,研究其对细胞生长、成骨、成血管分化的影响;利用β-磷酸三钙(β-tricalcium phosphate,β-TCP)三维支架材料负载辛伐他汀,与脂肪干细胞复合,构建组织工程骨,用于兔颅骨缺损模型的修复。方法：原代培养兔脂肪干细胞(rabbit adipose-derived stem cells, rASCs),分别以含0、0.01、0.1和1 μmol/L辛伐他汀的培养液培养,计数法检测细胞数目;以0、0.05、0.1 μmol/L浓度辛伐他汀培养ASCs,1、7 d后,实时定量PCR检测成骨、成血管基因的表达(RUNX2、OPN、OCN、VEGF); 7 d后行ALP染色;14 d后行茜素红染色。12只新西兰大白兔颅顶双侧8 mm缺损,分别以4组材料修复(A: β-TCP,B: β-TCP/Cell,C: β-TCP/Sim,D: β-TCP/Cell/Sim),每组6例,植入8 周后取材,进行组织学观察。采用SPSS17.0软件包对数据进行统计学分析。结果：0.05 μmol/L辛伐他汀对脂肪干细胞RUNX2、OCN、OPN和VEGF等成骨、成血管基因的表达具有明显促进作用,碱性磷酸酶染色和von Kossa染色更为明显;植入体内8周后,β-TCP/Cell/Sim组材料的成骨面积显著大于其他3组。结论：0.05 μmol/L辛伐他汀在体外对ASCs具有明显的促成骨作用,载辛伐他汀β-TCP复合脂肪干细胞可促进兔颅骨缺损的修复。     

Tideglusib对LPS刺激的人根尖牙乳头干细胞牙/骨向分化的影响

目的 探讨Tideglusib对LPS刺激的人根尖牙乳头干细胞(stem cells from the apical papilla, SCAPs)的牙/骨向分化的影响。方法 分离培养SCAPs,流式细胞术对SCAPs进行表面分子鉴定,检测Tideglusib对SCAPs细胞增殖是否有影响。通过碱性磷酸酶(alkaline phosphatase, ALP)活性和ALP染色筛选Tideglusib促进SCAPs表达ALP活性的最佳浓度。用大肠杆菌脂多糖(lipopolysaccharide, LPS)模拟炎性微环境刺激SCAPs。采用Western blot及实时定量聚合酶链反应(quantitative real-time polymerase chain reaction, RT-qPCR)等方法检测牙/骨向分化的相关蛋白(OSX、OCN、COL-Ⅰ、DSP、RUNX2)和基因(OSX、OCN、COL-Ⅰ、DSPP、RUNX2)表达变化。结果 CCK-8实验显示：Tideglusib浓度低于50 nmol/L时对细胞增殖无抑制作用;1 nmol/L Tideglusib处理LPS刺...     

siRNA沉默CPNE7基因表达抑制人牙周膜细胞的增殖及骨向分化

目的:探讨沉默CopineⅦ(CPNE7 siRNA)对人牙周膜细胞(human periodontal ligament cells,hPDLs)增殖及骨向分化的作用及其可能机制.方法:体外分离培养hPDLs,采用脂质体转染法将沉默CPNE7的质粒pSUPER-CPNE7转染至hPDLs.采用RT-PCR和Western印迹法检测CPNE7的表达,ELISA检测CPNE7 siRNA对NF-κB活性的作用.给予10 μmol/L NF-κB抑制剂吡咯烷二硫代甲酸铵盐(pyrrolidinedithiocarbamic acid ammonium salt,PDTC)预处理hPDLs 30 min,采用CCK8检测CPNE7对细胞增殖的影响,ELISA检测碱性磷酸酶(alkaline phosphatase,ALP)活性,RT-PCR和Western印迹法检测RUNX2、OSX和OCN的表达.采用SPSS11.0软件包对数据进行统计学分析.结果:hPDLs经转染pSUPER-CPNE7,CPNE7表达下调,有显著性差异(P＜0.05).CPNE7 siRNA显著增强NF-κB的活性.与对照组(CON)相比,CPNE7 siRNA显著抑制hPDLs增殖,下调ALP活性及RUNX2、OSX和OCN的表达,给予PDTC促进hPDLs增殖,增强ALP活性并上调RUNX2、OSX和OCN的表达.结论:CPNE7 siRNA通过NF-κB通路抑制hPDLs增殖和骨向分化.     

BMP2/Smads通路介导富血小板纤维蛋白对人牙髓干细胞成骨分化的作用研究

目的:基于骨形态发生蛋白2(BMP2)/母亲信号蛋白同源物通路(Smads)通路,分析富血小板纤维蛋白(PRF)对人牙髓干细胞成骨分化的作用.方法:分离纯化牙髓干细胞,流式细胞仪检测并鉴定牙髓干细胞表面抗原标记物,随机分为对照组、PRF组、BMP激活剂组和BMP抑制剂组(简称激活剂组和抑制剂组),检测培养7d、14d后的碱性磷酸酶(ALP)活性;RT-qPCR检测牙髓干细胞胶原蛋白Ⅰ(COL-Ⅰ)、Runt相关转录因子2(RUNX2)、骨钙素(OCN) mRNA相对表达水平;茜素红染色观察矿化结节形成;Western-Blot检测牙髓干细胞BMP2、Smad1、Smad5、p-Smad1/5、RUNX2蛋白相对表达水平.结果 ..STRO-1、CD29、CD90表达阳性,符合牙髓干细胞的表型.各组ALP活性随时间延长而升高(P＜0.05),从对照组到抑制剂组、PRF组、激活剂组,牙髓干细胞ALP活性及COL-Ⅰ、RUNX2、OCN mRNA相对表达水平依次升高,红色矿化结节数目、A值依次增加(P＜0.05).从抑制剂组到对照组、PRF组、激活剂组,牙髓干细胞BMP2、p-Smad1/5、RUNX2蛋白相对表达水平依次升高(P＜0.05).结论 ..PRF可能通过激活BMP2/Smads信号通路促进人牙髓干细胞成骨分化.     

丹参注射液促进人脱落乳牙牙髓干细胞成骨/成牙分化的实验研究

目的 探讨中药丹参对人脱落乳牙牙髓干细胞(SHEDs)成骨/成牙分化功能的影响.方法 利用50mg/ml的丹参注射液作用于SHEDs细胞,利用成骨/成牙分化诱导培养基诱导SHEDs定向分化.通过检测ALP活性、茜素红染色、钙离子定量分析、成骨/成牙分化相关基因的表达研究 SHEDs 体外成骨/成牙分化能力.Western Blot检测AKT信号分子的表达.结果 50mg/ml的丹参注射液促进SHEDs细胞ALP活性,体外矿化能力及成骨/成牙分化相关基因骨涎蛋白(bone sialoprotein,BSP)、牙本质涎磷蛋白(Dentin sialophosphoprotein,DSPP)的表达.50mg/ml的丹参注射液促进磷酸化AKT的表达.结论 50mg/ml的丹参注射液具有促进SHEDs细胞体外成骨/成牙分化的潜能,其作用可能与激活AKT信号通路相关.     

Runx2、Osterix转录因子过表达驱动内皮细胞成骨分化的机制探讨

目的:探讨Runx2和Osterix (OSX)过表达对人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVECs)成骨分化的调控作用.方法:通过慢病毒载体,将Runx2和Osterix基因分别转染入HUVECs.通过碱性磷酸酶(ALP)染色、半定量活性检测,探讨过表达Runx2和Osterix对HUVECs成骨分化的影响.通过RT-PCR、蛋白免疫印迹、免疫荧光染色检测成骨相关标志物Runx2、OSX、ALP、骨涎蛋白(BSP)、骨桥蛋白(OPN)、骨钙蛋白(OCN)在HUVECs中的表达.采用GraphPad Prism 6.01软件包对数据进行统计学分析.结果:Runx2过表达有利于HUVECs的成骨分化,而Osterix过表达则无此作用.HUVECs转染Runx2过表达慢病毒后,成骨相关基因Runx2、OSX、ALP、BSP、OPN及OCN的转录水平上调,同时Runx2、OSX、OPN及OCN的蛋白表达水平亦有所上调.结论:Runx2过表达可促进HUVECs的成骨分化.     

cAMP信号通路在根尖牙乳头干细胞定向分化中的作用

目的:探讨环磷酸腺苷(cAMP)信号通路对根尖牙乳头干细胞(SCAP)定向分化的影响.方法:酶消化法培养细胞;在矿化诱导液中分别加入信号通路激活剂Forskolin (FOR)和抑制剂H-89;通过茜素红染色和定量分析检测钙盐沉积;QPCR检测相关矿化基因mRNA的表达.结果:激活SCAPs内的cAMP信号后,该细胞茜素红染色增强,并上调矿化基因ALP、OCN、OSX、RUNX2的mRNA表达;而抑制SCAPs中cAMP信号后,该细胞茜素红染色减弱,并下调矿化基因的表达.结论:激活cAMP/PKA信号通路促进SCAPs分化,抑制信号通路则发挥相反作用,说明该信号通路对根尖牙乳头干细胞向成牙/成骨分化有一定的调节作用.     

人牙周膜干细胞成骨相诱导后相关基因的表达变化

目的:对人牙周膜干细胞进行筛选纯化,骨向诱导后观察其成骨能力,并对成骨相分化过程中相关基因的表达变化进行检测。方法:用组织块联合磁珠分选法分离纯化人牙周膜干细胞,初步探讨其成骨性能,碱性磷酸酶(ALP)和茜素红染色观察其成骨情况,实时定量PCR检测其相关成骨基因的表达变化。利用SPSS12.0软件包对数据进行统计学分析。结果:组织块联合磁珠分选法能成功培养出高纯度的人牙周膜干细胞。体外培养中,PDLSCs具备成脂和成骨的双相分化能力。在成骨诱导过程中,FOXO1和RUNX2的表达先升高再降低,ALP和OCN的基因表达水平持续增高。结论:成骨相关基因 ALP、RUNX2、FOXO1和OCN均参与其向成骨样组织分化的过程,其表达变化具有时间规律性,与成骨过程类似。     

瘦素对人牙髓干细胞增殖及分化的影响

目的 探讨瘦素(leptin)对体外培养的牙髓干细胞增殖、分化的影响.方法 体外培养牙髓干细胞,采用MTT法及流式细胞技术检测不同浓度瘦素对牙髓干细胞增殖作用的影响,通过碱性磷酸酶、Yon Kossa染色及矿化相关蛋白(DSP、OCN)的免疫组化染色来检测瘦素对牙髓干细胞分化的影响.结果 瘦素对牙髓干细胞增殖没有显著作用,但是对牙髓干细胞的ALP活性呈浓度依赖性促进.Von Kossa染色可见矿化结节形成,DSP及OCN表达阳性.结论 瘦素可促进牙髓干细胞向成牙本质细胞分化.     

Evidence of the validity of a model of determinants of quality of restorative dental care

A model describing the relationship between self-reported quality of restorative dentistry and dentist characteristics for 119 Montana general dentists is presented. The best predictors formed a significant model explaining 22% of the variance of the quality measure. Results are contrasted with a previous estimation of the model for 102 Washington general practitioners. Evidence for the external validity of the model is presented.     

Experimental evidence of formation of imines in the course of reduction of hydrazones

The reduction of hydrazones is generally suggested to proceed through a reductive cleavage of the nitrogen–nitrogen bond followed by a reduction of the carbon–nitrogen bond. This sequence of reduction processes is here supported for fluorenone (V) and benzophenone (VI) hydrazones as well as by a comparison of the reduction of fluorenone and benzophenone hydrazonium ions (I,III) with corresponding imines (II,IV). Another proof of the presence of imines as intermediates is the splitting of four-electron waves of hydrazones V and VI and hydrazonium ions I and VIII into two waves at pH < 2. This has been interpreted as due to differences in slopes dE_1/2/dpH and pK_a-values of protonated hydrazine derivatives on one side and corresponding imines on the other. In this pH-range imines formed in reductions of VI and VIII are reduced in a single two-electron wave, those of I and V in two one-electron steps. Fluorenone imine (II) is sufficiently stable to allow recording of time-independent current–voltage curves between pH 6 and 11. In this pH-range the imine (II) is reduced in two one-electron steps. Benzophenone imine (IV) has been found stable between pH 4.6 and 12. At pH 4.6–8 the reduction of the imine IV takes place in a single two-electron step, at pH 8–12 in two one-electron steps. Final proof of the initial cleavage of the N–N bond is presented by comparison with the reduction of nitrones.     

不同剂型玻璃离子水门汀溶解性比较研究

目的:研究、比较不同剂型玻璃离子水门汀的溶解性和表面微观形态改变,为临床使用提供依据.方法:将3M树脂加强型玻璃离子水门汀(水粉剂型)、GC玻璃离子水门汀(水粉剂型)及GC玻璃离子水门汀(双糊剂型)分别在人工唾液中浸泡30 d,冷热循环15000次,烘干测重,比较前后质量变化,计算溶解率,并用扫描电镜观察表面微观改变.结果:不同剂型的玻璃离子水门汀溶解率由高到低分别为3M树脂加强型玻璃离子水门汀(水粉剂型)、GC玻璃离子水门汀(水粉剂型)、GC玻璃离子水门汀(双糊剂型).3种玻璃离子水门汀经浸泡溶解后,SEM扫描表面微观形态可观察到GE玻璃离子水门汀(双糊剂型)表面形态改变较少,其他2组玻璃离子水门汀表面微观改变较多.结论:双糊剂型玻璃离子水门汀理化性能及溶解率均低于传统水粉剂型,是未来临床修复治疗的的良好选择.     

Design of clinical trials of traditional therapies of periodontitis

The present paper on the design of clinical trials of periodontal therapy first addresses the issue of the etiology of periodontal disease. It is suggested that most if not all forms of destructive periodontal disease are caused by microorganisms and that there are different forms of disease with different microbial etiologies. The progressive nature of destructive periodontal disease is subsequently discussed and it is emphasized that, in a given patient, periodontal sites which show signs of inflammation and attachment loss may not over a period of several months and years show further sign of attachment loss. The present methods of assessing periodontal disease do not allow us to discriminate between potentially active and inactive sites in untreated patients. The significance and variability of indicators of periodontal disease such as bleeding on probing, probing pocket depth and probing attachment level measurements are discussed. The errors inherent in the various measurements are analyzed and suggestions are presented describing how alterations in any of the above parameters could be identified and presented in a clinical trial. Of concern for the statistical analysis of clinical data of periodontal disease is the definition of the "experimental unit". For a number of years, the "experimental unit" in periodontal trials was the patient. It is clear, however, that different sites within the same individual show different patterns of disease progression and lesion morphology and often respond differently to periodontal therapy. Statistical analyses must consequently be designed which recognize differences in site-to-site infection and lesion morphology within a common host. Until such analyses are available, the investigator should be wary of pooling data within the same individual, since such pooling may obscure meaningful alternatives which may take place in individual periodontal sites. Some goals of periodontal therapy are subsequently identified. 4 goals are discussed more in detail, namely: to establish conditions which will allow the patient to maintain a dentition without further breakdown of the periodontium; to reduce pocket depth to establish an anatomy in the dentogingival region which with proper maintainance care will prevent the re-establishment of the subgingival infection; to gain attachment as a result of treatment; to assess the effect of a certain chemotherapeutic agent on periodontal disease.     

Evaluation of efficacy of chemiluminescence for diagnosis of leukoplakia

ObjectiveLeukoplakia is the most common potentially malignant disorder preceding oral cancer. Chemiluminescence has been developed as an adjunct to conventional examination for the diagnosis of these potentially malignant disorders. This study was conducted to assess the efficacy of chemiluminescence in the diagnosis of leukoplakia and to compare the results with histopathological examination.Study designA total of 50 patients with leukoplakia were included from the outpatients attending the Department of Oral Medicine and Radiology, Dental Hospital, Bengaluru, Karnataka, India. These patients were subjected to conventional oral examination followed by chemiluminescent examination with Vizilite (Zila, Fort Collins, CO, USA) and biopsy for histopathological confirmation.ResultsThe sensitivity, specificity, positive predictive value, and negative predictive value of chemiluminescence were 93.75%, 55.56%, 78.95%, and 83.3%, respectively. The overall accuracy of chemiluminescence was 80%. A statistically significant association was observed between histopathology results and chemiluminescence results.ConclusionAlthough it is an easy, safe, minimal time consuming, and noninvasive technique, it has only adjunctive utility and it does not replace biopsy for the diagnosis of leukoplakia.     

颌骨动静脉畸形的栓塞治疗

目的：总结直接穿刺结合经血管内介入栓塞治疗颌骨动静脉静脉畸形的经验。方法：收治凳骨动静脉畸形患者6例,均进行了介入栓塞治疗。采用的栓塞材料为附凝血棉纤毛的螺圈,聚乙烯醇泡沫微粒和二氰基丙烯酸对丁酯。数字减影颈动脉造影在PHILIPSV300下完成。结果6例颌骨动静脉畸形患者中4,例急性出血得到了快速、有效控制,1例慢性渗血的右下 骨动静脉畸形患者,介入栓塞治疗,拔除松动的右下凳第一磨牙,有效地控制了出血,另1例伴局部软组织搏动性膨隆的上凳骨动静脉畸形患者,介入治疗后膨隆的搏动性得到明显改善,栓塞治疗后分别随访3－24个月,均未发现有口腔内渗血或出血。随访的X线片上,病灶区可见新骨形成。结论：局部穿刺结合经血管内介入栓塞治疗颌骨动静畸形是一种安全、有效的治疗方法。     

正畸患者切牙影像失真发生情况分析

目的研究正畸患者曲面体层片上的切牙影像失真发生情况，并分析其原因。 方法从中山大学附属口腔医院放射科影像数据库中选取500例正畸患者的曲面体层片和头影测量侧位片，所有曲面体层片均采用咬合杆投照，分别从切牙牙体影像放大、缩小、牙根变短、根尖模糊等评价指标分析上下颌切牙影像失真的发生情况，在头影测量侧位片上测量中切牙根尖-对颌切牙切缘的距离，探讨切牙影像失真发生的原因。采用SPSS 19.0统计软件对所得数据进行统计学检验。 结果500例患者中，切牙牙体影像正常者共417例，切牙牙体影像失真者共83例，影像失真发生率16.6%，其中切牙牙体影像放大17例、牙体影像缩小0例、牙根变短30例，牙根影像变短伴模糊36例。影像失真患者的根尖-切缘距离大于影像正常的患者，差异有统计学意义（F = 5 187.18，P = 0）；影像失真患者的覆盖值大于影像正常的患者，差异有统计学意义（F>477，P = 0）。 结论严重牙颌面畸形如反 、深覆盖是导致曲面体层片的切牙影像失真的主要原因之一。     

正常青年Monson球面半径的测量研究

目的测量正常青年Monson球面半径。方法选择60名(男30名,女30名)正常青年制取全口印模,应用立体摄影成像的原理与方法对Monson球面半径进行测量和统计学处理。结果Monson球面的半径平均为10.173 cm,大于理论值10.160 cm,差异有显著性(P<0.01);男、女性球面半径差异无显著性。结论本实验所得到的数据可作为全口义齿修复中记录颌位关系的一个参量。     

鼻测量法的进展

唇裂术后继发畸形是指唇裂修复术后,仍遗留或继发于手术操作和生长发育变化而表现出来的一类畸形[1]。包括唇畸形、鼻畸形和颌骨畸形。其修复较原发性唇裂修复更复杂,更灵活多变。而导致其修复复杂性的一个重要原因即是局部组织结构复杂变异和缺乏可靠的三维测量手段[2],鼻畸形