降钙素基因相关肽对成骨细胞OPN表达的影响

目的:探讨外源性降钙素基因相关肽(Calcitonin gene related peptide, CGRP)对大鼠成骨细胞中骨桥蛋白(Osteopontin,OPN)表达的影响。方法:胶原酶消化法培养大鼠原代成骨细胞,碱性磷酸酶染色及茜素红染色对成骨细胞进行鉴定。CCK-8细胞增殖实验筛选CGRP最适作用浓度。将合适浓度的CGRP作用于成骨细胞,qPCR和Western Blot检测OPNmRNA及蛋白的表达。结果:CGRP浓度为10^-9 mol/L时,大鼠成骨细胞的增殖活性最强。使用10^-9 mol/L浓度的CGRP作用于成骨细胞,成骨细胞中OPN mRNA及蛋白的表达在第3天明显上调(P<0.05)。结论:CGRP可以促进成骨细胞中OPN的表达。     

负载CGRP及SP的明胶缓释微球用于修复家兔骨质疏松模型骨缺损的研究

目的: 将负载不同浓度的降钙素基因相关肽(CGRP)及P物质(SP)的明胶缓释微球植入骨质疏松兔的股骨缺损中,观察其对骨缺损修复的影响。方法: 通过去势方法建立兔骨质松模型,利用乳化交联的方法制备负载不同浓度的CGRP及SP的明胶缓释微球。将24只骨质疏松兔随机分组,于股骨髁部制备骨缺损并分别植入负载10^-6 mol/L、10^-8 mol/L和10^-10 mol/L的SP以及CGRP的明胶微球,3个月后处死观察结果。结果: 负载不同浓度的CGRP及SP均能有效地促进成骨,影像学结果示SP在10^-6 mol/L时其骨体积分数最高,并且能有效提高骨小梁数量,降低骨小梁间的间距(P<0.05),CGRP在浓度为和10^-8 mol/L时效果即达到上述效果;而组织学结果示SP和CGRP均在浓度为10^-6 mol/L时其新生骨组织比例最高(P<0.05)。结论: 负载不同浓度的CGRP及SP均能有效地促进骨质疏松兔骨缺损的成骨,在所研究的浓度中,高浓度的效果优于低浓度的效果。     

淫羊藿甙对MC3T3-E1细胞活性及功能作用的实验研究

目的研究淫羊藿甙(ICA)对体外培养的成骨样细胞MC3T3-E1的活性及功能作用的影响,探讨ICA对成骨细胞生长、分化的作用。方法体外培养的MC3T3-E1细胞按ICA刺激浓度0、1×10-9、1×10-8及1×10-7mol/L分为4组,给药后24、48及72 h通过MTT法分别检测细胞活性;检测4、7、10 d的ALP活性以及7、14、21 d的骨钙素含量。结果在3个时间点,ICA组的OD值、ALP活性和OC含量均高于对照组;48、72 h时1×10-8组和1×10-9组的OD值均显著高于对照组(P<0.05);7 d的1×10-8组ALP、10 d的1×10-8组和1×10-9组ALP活性均显著高于对照组(P<0.05);14、21 d的1×10-8组和1×10-9组的降钙素含量均显著高于对照组(P<0.05)。结论 ICA对MC3T3-E1细胞的活性和成骨作用具有促进作用,其中以浓度为1×10-8mol/L效果最好。     

氟化钠对人牙周膜细胞增殖及矿化能力的影响

目的:观察氟化钠对体外培养的人牙周膜细胞增殖及矿化能力的影响,为氟添加入牙周组织工程药物中的应用提供依据.方法:原代培养并鉴定人牙周膜细胞,应用CCK8检测不同浓度NaF对hPDLCs增殖的影响,并筛选出4个浓度用于矿化实验.矿化条件下,将0、1×10-5、5×10-4和1×10-3 mol/L的NaF作用hPDLCs后,通过碱性磷酸酶(ALP)染色、茜素红染色和实时荧光定量PCR检测矿化能力及成骨相关基因的表达.采用SPSS20.0软件包对数据进行单因素方差分析.结果:5×10-5、1×10-4、5×10-4 mol/L的NaF均能促进hPDLCs增殖,且以5×10-4 mol/L效果最佳(P＜0.05).而1×104 mol/L的NaF碱性磷酸酶染色阳性面积最大、茜素红染色矿化结节数量最多(P＜0.05).RT-PCR结果根据时间、指标变化程度较大.结论:5×10-5、1×10-4、5×10-4 mol/L的NaF能促进hPDLCs的增殖能力,1×10-5 mol/L的NaF能提高hPDLCs的碱性磷酸酶活性及钙结节形成.     

柚皮苷对犬骨髓基质细胞体外增殖及成骨分化的影响

目的:研究犬骨髓基质细胞(bone marrow stromal cells, BMSCs)在柚皮苷诱导下定向成骨及成骨分化能力。方法:抽取犬骨髓,贴壁法体外培养,流式细胞仪鉴定,加入不同浓度柚皮苷(1×10-5、1×10-6、1×10-7、1×10-8、1×10-9 mol/L)诱导,以CCK-8检测药物毒性,定量检测碱性磷酸酶、von Kossa检测钙结节形成。采用SPSS20.0软件包对数据进行统计学分析。结果:经流式细胞仪检测,CD34、CD45低表达、CD90高表达分别为0.126%、0.075%和95.4%;柚皮苷浓度在10-6、10-7 mol/L时,能明显促进细胞增殖;经柚皮苷诱导后,碱性磷酸酶含量显著提高,其中,浓度为10-6 mol/L时,ALP相对值最高(P<0.05);von Kossa钙结节检测呈阳性。结论:犬骨髓基质细胞在柚皮苷诱导下能分化为成骨细胞。柚皮苷浓度为10-6 mol/L时,能明显促进骨髓基质细胞的增殖及分化。     

成骨生长肽对体外人牙髓细胞增殖和矿化作用的影响

目的 观察成骨生长肽(OGP)对体外人牙髓细胞增殖和矿化作用的影响.方法 酶消化组织块法体外培养人牙髓细胞(hDPCs),倒置相差显微镜观察hDPCs的形态.CCK-8、碱性磷酸酶(ALP)试剂盒检测筛选最佳浓度OGP;最佳浓度组、对照组、单纯矿化液组和含最佳浓度的矿化液组做茜素红、Von Kossa染色和反转录聚合酶链反应(RT-PCR)检测.结果 酶消化组织块法可以良好的体外培养hDPCs;OGP浓度在10-7 ～ 10-11 mol/L均能促进hDPCs增殖和ALP活性:促增殖最佳浓度为10-10 mol/L,随时间延长,与10-9 mol/L浓度组间差异无统计学意义;OGP浓度为10-9 mol/L时能显著增强ALP活性.茜素红和Von Kossa染色观察第14、21天,四组均有钙化结节形成,联合组结节最大,数量最多;RT-PCR结果显示第7、14、21天,联合组的Ⅰ型胶原、牙本质涎磷蛋白(DSPP)和骨钙素(OCN)的mRNA表达量均高于其他各组(P ＜ 0.01).结论 OGP能促进体外hDPCs的增殖和分化,结合两者最优浓度为10-9 mol/L;茜素红和Von Kossa染色可以观察钙化结节形成过程;OGP联合矿化诱导液可以显著提高体外hDPCs的矿化.     

辛伐他汀对成骨细胞系MG63细胞的影响及意义

目的:探讨辛伐他汀对体外培养的成骨细胞系MG63细胞功能的影响,为辛伐他汀用于牙槽骨缺损再生的研究提供理论依据.方法:MG63成骨细胞经辛伐他汀处理后,分别用MTT法、荧光实时定量PCR与细胞微趋化试验检测其功能.采用SPSS14.0软件包进行单因素方差分析.结果:10-9mol/L与10-8mol/L浓度辛伐他汀可轻微促进MG63细胞的增殖;而10-6mol/L与10-7mol/L浓度的辛伐他汀可显著提高骨保护素与骨钙素基因的表达,差别具有统计学意义;所有浓度的辛伐他汀均对MG63细胞的迁移能力具有明显抑制作用.结论:辛伐他汀可促进骨质缺损的再生,其促进作用主要是通过成骨相关基因的表达增加来实现的.     

氯化镧对人牙龈成纤维细胞增殖的影响

目的:检测不同浓度氯化镧(La3 )对人牙龈成纤维细胞(HGF)增殖的影响。方法:体外培养HGF,用四唑盐法(MTT)检测6种浓度La3 (1×10-6、1×10-5、5×10-5、1×10-4、1×10-3及1×10-2 mol/L)对HGF的作用。结果: 1×10-2 mol/L的La3 能抑制HGF的生长, 1×10-6、1×10-5、5×10-5、1×10-4及1×10-3 mol/L的La3 对HGF生长无抑制作用。结论: 1×10-2 mol/L浓度的La3 对HGF增殖有抑制作用, 1×10-4 mol/L以下浓度的La3 对HGF无抑制作用。     

骨化三醇对不同维生素D受体Fok Ⅰ基因型人牙周膜细胞增殖的抑制作用

目的:观察骨化三醇[1,25-(OH)2D3,VD3]对人牙周膜细胞(human periodontal ligament cells,hPDLCs)增殖的作用并分析维生素D受体FokⅠ多态性位点(rs2228570,T/C)对此作用的影响。方法:原代培养个体来源hPDLCs群,限制性内切酶片段长度多态性法检测细胞群维生素D受体FokⅠ多态性位点基因型。选取第4代具有FF、Ff、ff基因型hPDLCs群,用0.1%无水乙醇(对照组)、10-14～10-8 mol/L VD3分别处理1d、3d、5d、7d,MTT法检测细胞的增殖情况。用SPSS11.5软件包对数据进行单因素方差分析和LSD Post Hoc检验。结果:VD3以时间和剂量依赖性抑制3种基因型hPDLCs群的增殖。与对照组和其他各浓度组相比,10-8mol/L VD3的抑制作用最强,第5天或第7天达到最大抑制效应。与相应的对照组比较,对FF细胞群产生显著抑制效应的最低VD3浓度为10-12mol/L(P0.01),Ff为10-10mol/L(P0.01),ff为10-8 mol/L(P0.01)。10-8 mol/L VD3对ff细胞群增殖的最大抑制率为16.93%,显著低于FF(31.20%,P0.05)和Ff(29.68%,P0.05)细胞群。第3天和第5天,10-8mol/L VD3对不同基因型细胞群增殖产生的抑制作用由强至弱为FFFfff(P0.01)。结论:VD3能够显著抑制hPDLCs的增殖,维生素D受体FokⅠ多态性位点可能对这一过程产生影响。     

淫羊藿苷对犬骨髓间充质干细胞增殖、成骨和成脂分化的影响

目的:研究淫羊藿苷对犬骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs)增殖和成骨、成脂分化的影响。方法:将淫羊藿苷配制成终浓度为1×10-9、1×10-8、1×10-7、1×10-6、1×10-5、1×10-4 mol/L的溶液,以0 mol/L组为空白对照组,分别用于体外培养犬BMSCs。CCK-8试剂盒检测细胞增殖情况,碱性磷酸酶试剂盒检测碱性磷酸酶活性。然后实验分为淫羊藿苷组和对照组,分别在含或不含成骨、成脂诱导液条件下,行成骨、成脂诱导分化实验,通过茜素红和油红O染色检测各组钙沉积和脂质形成面积。结果:发现淫羊藿苷1×10-6 mol/L组促进犬BMSCs增殖,而1×10-4mol/L组抑制增殖。碱性磷酸酶活性与淫羊藿苷浓度呈剂量依赖性关系。不含成骨、成脂诱导液条件下,各组均几乎未见明显钙沉积和脂质形成;含成骨、成脂诱导液条件下,淫羊藿苷组(1×10-6 mol/L)钙沉积面积高于对照组,脂质形成面积低于对照组。结论:淫羊藿苷能促进犬BMSCs增殖和成骨分化,并抑制其成脂分化。     

Diagnosis and management of hemangiomas and vascular malformations of the head and neck

Oral Diseases (2010) 16 , 405–418 Vascular anomalies are congenital errors in vascular development. They frequently involve the head, neck, and oral cavity. Subdivided into vascular tumors (hemangiomas) and vascular malformations, vascular anomalies remain poorly understood. However, growing interest and recent advances in the diagnosis, management, and molecular characterization of these lesions are improving treatment strategies. The role of the multidisciplinary team cannot be overstated. This review provides both basic and up‐to‐date knowledge on the most common vascular anomalies encountered by physicians and practitioners. Because treatment options for vascular anomalies are widely variable and often debated, this report aims to provide a comprehensive approach to these lesions based upon current concepts and practical clinical experience.     

口腔颌面-头颈部胚胎型横纹肌肉瘤临床诊治探讨

目的:探讨头颈部胚胎型横纹肌肉瘤的临床特点、诊断、治疗及预后.方法:回顾性分析上海交通大学医学院附属第九人民医院2000-09--2010-10收治的12例头颈部胚胎型横纹肌肉瘤患者的临床资料.结果:12例患者中9例获得随访.5例术前化疗患者中3例短期疗效达到PR,1例达到MR,化疗有效率达到60%;8例患者行手术治疗...     

Colour and translucency of opaque-shades and body-shades of resin composites

The purpose of this study was to evaluate the optical properties--not only the translucency but also the colours--of opaque-shade resin composites. The CIELAB parameters (L*, a* and b*) of disks of A2 and opaque A2 (OA2) shades of Charisma (Heraeus-Kulzer), Solare (GC) and Filtek Supreme (3M) were evaluated on backings of black, white and the material itself to calculate the translucency parameter (TP) and the colour differences (delta E*) between A2 and OA2. A two-way analysis of variance (anova) for the TP indicated a less statistically significant TP value in the OA2 shade than the A2 shade for all products. As for the products, Charisma showed a statistically greater TP value than the other two products. Regarding the delta E* between A2 and OA2, all the products revealed clinically perceptible colour differences (delta E* > 3.3). Hence, we must take the colour differences of opaque-shade resin composites into consideration, as well as the translucency of the materials, for a clinically acceptable colour match of the restoration.     

种植体周围炎与牙周炎的类比探究

种植体周围炎症是种植失败的主要原因之一,包括种植体周围黏膜炎和种植体周围炎。种植体周围炎的发生、发展及治疗和预防与牙周炎存在一定的相似性,本文将种植体周围炎和牙周炎的流行病学、组织病理表现、始动因素、危险因素、治疗和预防等方面进行类比,探讨如何更好地预防和治疗种植体周围炎。     

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牙拔除术是一种常见的外科手术,术后因机体对拔牙创伤的生理反应会不可避免地引起局部出现程度不一的疼痛、肿胀,这种由手术创伤引起的疼痛、肿胀虽然是正常手术的继发过程,但会导致患者术后生活质量下降,并可使很多由于恐惧而不敢拔牙的患者延误了最佳治疗时机。本文就拔牙术后疼痛和肿胀的发生原因、临床表现、治疗方法和预防措施进行阐述,为临床上如何避免或减轻拔牙术后的疼痛和肿胀提供帮助。     

Assessment and comparison of phagocytic function and viability of polymorphonuclear leukocytes in saliva of smokers and non-smokers

OBJECTIVES

Tobacco use is one of the most important public health problems worldwide. It is also linked to impairment of normal immunologic surveillance and defence mechanism of polymorphonuclear leukocytes. Tobacco smoke and its components have been seen to affect the phagocytic ability and viability of polymorphonuclear leukocytes suggesting the pathogenesis of tobacco induced oral diseases. Aim of this study was to assess and compare the phagocytic function and viability of polymorphonuclear leukocytes in saliva of smokers and non smokers.

DESIGN

The study comprised of 35 smokers and 35 non-smokers, age matched. Saliva was collected by rinsing method and the polymorphonuclear leukocytes were separated. Phagocytic activity was determined by using latex spheres as targets. Cell viability was measured using trypan blue stain.

RESULTS

Salivary polymorphonuclear leukocytes in smokers showed significant reduction in the phagocytic activity by ingesting few latex spheres when compared to the non-smokers. The viability of these cells in saliva of smokers was significantly reduced.

CONCLUSIONS

The present study revealed reduced phagocytic activity and viability of salivary polymorphonuclear leukocytes in smokers compared to non-smokers. These findings indicate that smokers are more prone to gingival, periodontal and other oral diseases. Thus indicating that the health care professionals should encourage smoking cessation as an aid in preventing oral diseases.     

Combined effects of NaF and SLS on acid- and polysaccharide-formation of biofilm and planktonic cells

Bacteria grow preferentially attached to surfaces embedded in an exopolysaccharide matrix to form biofilms. In this mode of growth, bacteria often show reduced susceptibility to antimicrobials. The aim of this study was to investigate whether the combination of NaF and the detergent sodium lauryl sulphate (SLS) could result in additive effects on acid formation by planktonic and biofilm cells, as well as on extracellular polysaccharide formation. An additive inhibitory effect on Streptococcus mutans acid formation was observed, both in planktonic and biofilm cells. In dental biofilms, SLS alone and in combination with NaF reduced acid formation. Extracellular polysaccharide formation by S. mutans and saliva was reduced by SLS alone and in combination with NaF. In dentifrices and mouthrinse solutions, NaF and SLS are often present in combination. It remains to be determined whether an additive effect on acid formation may also occur in dental biofilms under different concentrations from those used in the present study, and whether the effects may be selective for certain bacterial species.     

Effects of zinc and copper on adhesion and hemagglutination of Prevotella intermedia and Prevotella nigrescens

This study investigated the mechanism of protein attachment to the surface of the putative periodontal pathogens Prevotella intermedia and Prevotella nigrescens in artificial gingival crevicular fluid, and ways to increase protein attachment to the bacterial cells. The effects of cations on protein attachment, bacterial adhesion, and hemagglutination were examined, and cation-binding components on both bacterial species were identified. The presence of cations, especially zinc, copper and cerium, increased attachment of human serum proteins to both bacterial species. In contrast, the presence of hydrophobic inhibitors or sugars had little effect. Protein attachment was reduced by heat treatment of the bacterial cells. Pretreatment of bacteria with human serum proteins inhibited adhesion of both species to buccal epithelial cells and hemagglutination. These effects were enhanced by the presence of zinc and copper during pretreatment. Using a chelating column, specific zinc- and copper-binding proteins were identified on the surfaces of both bacterial species.     

Impact of moderate and severe hypodontia and amelogenesis imperfecta on quality of life and self-esteem of adult patients

ObjectivesThe objective of this study was to investigate the impact of moderate and severe hypodontia and amelogenesis imperfecta on the quality of life and self-esteem of affected adult patients.MethodsForty one adult patients (aged 18–45 years) with clinical and radiological diagnoses of moderate to severe hypodontia and twenty seven patients diagnosed with amelogenesis imperfecta were age and gender matched with a control group of patients attending for routine dental care. Subjects completed the Oral Health Impact Profile [OHIP-49] and Rosenberg Self Esteem Scale. A paired t-test was used to analyse data; the test alpha level was set at P ≤ 0.05.ResultsThe results for hypodontia patients were significantly different from controls in six out of the seven OHIP-49 domains, the exception being the Handicap domain. Total scores were also significantly different between the two groups (P = 0.003). Self-esteem was not significantly different between the two groups (P = 0.98).For amelogenesis imperfecta patients the results were significantly different from control patients in four out of the seven domains of the OHIP-49 and also in the total scores (P = 0.01). When self-esteem was investigated there was no significant differences between the two groups (P = 0.92).ConclusionsModerate to severe hypodontia and amelogenesis imperfecta have marked negative impacts on the Oral Health Related quality of life of this patient population relative to controls. However, self-esteem was not significantly affected.