IL-6 mRNA和TGFβ1 mRNA在慢性根尖周病损组织中的表达

目的 检测IL-6 mRNA和TGFβ1mRNA在慢性根尖周病损中的表达及它们与临床病理表现之间的关系,探讨IL-6和TGFβ1在慢性根尖周炎发病中的作用.方法 采用RT-PCR法,从mRNA水平检测IL-6和TGFβ1在10例慢性根尖肉芽肿及3例根尖囊肿中的表达,3例阻生拔除的第三磨牙牙周膜组织作为对照,分析IL-6 mRNA和TGFβ1mRNA的表达水平与慢性根尖周病损的病理学表现之间的关系,并分析IL-6 mRNA和TGFβ1mRNA与病损大小之间的关系.结果 IL-6 mRNA和TGFβ1mRNA在根尖肉芽肿病损组和根尖囊肿组明显增高,表现为与β-actin水平的比值增高,IL-6 mRNA和TGFβ1mRNA在根尖肉芽肿组和根尖囊肿组中分别为1.11±0.24和0.87±0.10及0.94±0.53和1.55±0.22.TGFβ1在根尖囊肿组及大的根尖周病损中有增高的趋势.TGFβ1mRNA在中度、重度炎症细胞浸润组较轻度炎症细胞浸润组明显增高(P＜0.05).根尖周病损中的IL-6 mRNA和TGFβ1mRNA水平未发现有明显的相关关系.结论 IL-6和TGFβ1在慢性根尖周炎的发病中可能具有重要的作用.     

IL-1β mRNA和TNFα mRNA在慢性根尖周病损组织中的表达

目的:检测白细胞介素1β(interleukin-1 beta,IL-1β)mRNA和肿瘤坏死因子α(tumornecrosis factor alpha,TNFα)mRNA在慢性根尖周病损中的表达以及它们与病理学表现之间的关系,探讨IL-1β和TNFα在慢性根尖周炎发病中的作用。方法:采用RT-PCR法,从mRNA水平检测IL-1β及TNFα在10例慢性根尖周肉芽肿及3例根尖周囊肿中的表达,3例因阻生拔除的健康第三磨牙牙周膜组织作为对照,分析IL-1βmRNA和TNFαmRNA的表达与慢性根尖周病损的病理学表现(包括病损的病理分型、炎症细胞浸润程度)之间的关系。结果:IL-1βmRNA在根尖周肉芽肿病损组明显增高,表现为与β-actin水平的比值(1.36±0.12)增高,在根尖周囊肿病损组(0.87±0.30)较对照组(0.64±0.02)有增高的趋势,但统计学分析无显著性差异。IL-1βmRNA在轻、重度炎症细胞浸润组较中度炎症细胞浸润组明显增高(P<0.05)。TNFαmRNA水平在根尖周肉芽肿组和根尖周囊肿组均显著高于对照组(P<0.05),但两组间并无显著性差异。TNFαmRNA水平在轻、中、重度炎症细胞浸润组之间也无显著性差异。IL-1βmRNA和TNFαmRNA水平未发现有明显的相关关系。IL-1βmRNA和TNFαmRNA水平与病损大小无关。结论:IL-1β和TNFα在慢性根尖周炎的发病中具有重要的作用,但也存在其他细胞因子的协同作用。     

人慢性根尖周炎中白细胞介素17F的定位表达研究

目的 初步探讨白细胞介素( interleukin,IL) 17F在人根尖周炎病损组织中的表达情况,以期为根尖周炎的发病机制研究提供依据.方法 收集安徽医科大学口腔医学院口腔颌面外科2009年11月至2011年8月经根尖手术切除的根尖周炎病损组织并做病理鉴定.经过组织切片、HE染色和显微镜病理观察,共有根尖囊肿33例,根尖肉芽肿18例.将这些组织作为试验组用于免疫组织化学分析IL-17F的表达情况,用磷酸盐缓冲液代替一抗作阴性对照,根尖囊肿和根尖肉芽肿阴性对照组各5例.收集埋伏阻生智齿拔除时需凿骨患者的健康牙槽骨质5例,作为正常对照组.对根尖囊肿和根尖肉芽肿中IL-17F的蛋白平均吸光度值(A值)进行方差齐性检验,若方差齐则行t检验,若方差不齐则行秩和检验,检验水准为α =0.05.结果 IL-17F在两组慢性根尖周炎组织中的上皮细胞、淋巴样细胞、成纤维细胞和内皮细胞中均有表达;正常对照组和阴性对照组未见IL-17F的表达.根尖囊肿中IL-17F的蛋白平均积分吸光度值(A值)为0.8852±0.0576,根尖肉芽肿为0.2365±0.0708,二者差异有统计学意义(Z=3.735,P＜0.01).结论 IL-17F存在于人根尖周炎病损组织中;IL-17F可能参与了人根尖周炎疾病的发病进程,且IL-17F在根尖囊肿和根尖肉芽肿中的表达强度具有差异性.     

核因子кB受体激动子配体在慢性根尖周炎病损组织中的表达

目的:探讨核因子кB受体激动子配体(receptor activator of nuclear factorκB ligand,RANKL)在慢性根尖周炎发病中的作用。方法:采用RT-PCR法,从mRNA水平检测RANKL在10例慢性根尖肉芽肿及3例根尖囊肿中的表达,分析RANKLmRNA的表达与慢性根尖周炎病损的病理学表现(包括病损的病理分型、炎症细胞浸润程度)之间的关系,采用免疫组化的方法,对RANKL的表达进行细胞定位。结果:RANKLmRNA在根尖肉芽肿病损组和根尖囊肿组明显增高,但根尖肉芽肿和根尖囊肿组之间差异无显著性。RANKL mRNA在轻、重度炎症细胞浸润组较中度炎症细胞浸润组明显增高(P<0.05)。RANKL mRNA水平与病损大小无关。免疫组化结果显示,RANKL主要表达于浸润的炎症细胞中及增生的上皮细胞中。结论:RANKL在慢性根尖周炎的发病中具有重要的作用,但也提示存在其它细胞因子的协同作用。     

RORγT在人根尖肉芽肿和根尖囊肿中的表达及意义

目的:通过免疫组织化学方法对Th17细胞的特异性标记维A酸相关孤核受体γT(RORγT)进行检测,以阐明Th17细胞在人慢性根尖周病损中的表达及意义。方法:收集安徽医科大学口腔医学院口腔颌面外科经根尖手术切除的根尖囊肿18例,根尖肉芽肿22例作为实验组。收集埋伏阻生智牙拔除时需凿骨患者的健康牙槽骨5例作为正常对照组。对样本中RORγT蛋白表达水平进行免疫组织化学检测,同时检测白细胞介素(interleukin,IL) 17的蛋白表达水平。根据病变类型 (根尖肉芽肿、根尖囊肿、正常对照组) 和炎症浸润程度(轻度、中度、重度、正常对照组),分析RORγT和IL-17的蛋白表达水平。采用SPSS 17.0软件包对数据进行统计学分析。结果:RORγT表达于所有根尖周炎病损组织中,并显著高于正常对照组 (P<0.05),正常对照组中未检测到RORγT的表达;RORγT在轻度、中度和重度炎症细胞浸润中的表达水平均显著高于正常对照组 (P<0.05);RORγT和IL-17的蛋白表达水平在根尖肉芽肿(r=0.935,P<0.05)和根尖囊肿(r=0.803,P<0.05)中呈正相关。结论:RORγT在根尖肉芽肿和根尖囊肿中的表达量显著高于正常对照组,表明Th17细胞可能存在于根尖周病变中。     

核因子κB受体激动子配体在慢性根尖周炎病损组织中的表达

目的:探讨核因子κB受体激动子配体(receptor activator of nuclear factor κB liganol,RANKL)在慢性根尖周炎发病中的作用.方法:采用RT-PCR法,从mRNA水平检测RANKL在10例慢性根尖肉芽肿及3例根尖囊肿中的表达,分析RANKLmRNA的表达与慢性根尖周炎病损的病理学表现(包括病损的病理分型、炎症细胞浸润程度)之间的关系,采用免疫组化的方法,对RANKL的表达进行细胞定位.结果:RANKLmRNA在根尖肉芽肿病损组和根尖囊肿组明显增高,但根尖肉芽肿和根尖囊肿组之间差异无显著性.RANKLmRNA在轻、重度炎症细胞浸润组较中度炎症细胞浸润组明显增高(P＜0.05).RANKL mRNA水平与病损大小无关.免疫组化结果显示,RANKL主要表达于浸润的炎症细胞中及增生的上皮细胞中.结论:RANKL在慢性根尖周炎的发病中具有重要的作用,但也提示存在其它细胞因子的协同作用.     

IL-34在慢性根尖周病损组织中的表达及临床意义

目的:比较慢性根尖周病损组织和健康牙周膜组织中白细胞介素34(Interleukin-34,IL-34)的表达水平,探讨IL-34在慢性根尖周炎发病中的作用.方法:收集25例诊断为慢性根尖周炎患牙的根尖周组织作为病例组,22例因正畸拔除的健康牙的牙周膜作为对照组,应用实时荧光定量PCR(real-time PCR,RT-PCR)检测IL-34mRNA的表达:应用免疫组织化学法检测IL-34蛋白的表达,采用图像分析软件检测病例组中IL-34蛋白的表达水平.采用SPSS13.0软件包对数据进行统计学分析.结果:IL-34mRNA在慢性根尖周炎中的表达水平(3.53±3.07)显著高于对照组(1.07±0.76),IL-34蛋白在慢性根尖周病损组织中阳性表达,主要定位于淋巴细胞、浆细胞及巨噬细胞中,且病例组中IL-34蛋白表达水平显著高于对照组(P＜0.01).结论:IL-34可能与慢性根尖周炎症密切相关.     

白细胞介素-21和核因子κB受体活化因子配体在人根尖囊肿和肉芽肿中的表达及临床意义

目的 检测白细胞介素-21（IL-21）和破骨细胞核因子κB受体活化因子配体（RANKL）在根尖囊肿和根尖肉芽肿中的表达,分析两者在根尖周病中的关系,探讨IL-21在根尖周炎发病机制中的作用。方法 收集根尖囊肿23例和根尖肉芽肿32例作为实验组,记录相关病例的病损大小及有无叩痛表现;10例健康牙龈组织为对照组。利用免疫组织化学法检测所有样本中IL-21和RANKL蛋白的表达水平,分析IL-21的表达水平与RANKL表达、根尖病灶大小及叩痛的相关性。结果 所有病变组织均可检测到IL-21阳性细胞,而健康牙龈组织则未检测到IL-21的表达。根尖囊肿和肉芽肿中IL-21的表达强度分别为59.92±6.57和36.80±6.81,RANKL的表达强度分别为68.81±18.59和36.12±14.87。根尖囊肿组两种蛋白的表达水平均高于肉芽肿组（P<0.05）。相关性分析表明,IL-21的表达水平与RANKL及根尖病灶大小均呈正相关关系（P<0.05）。结论 IL-21存在于人慢性根尖周炎病损组织中,其表达水平与RANKL的表达量及病损大小呈正相关关系;IL-21可能通过促进RANKL蛋白的表达参与慢性根尖周炎的发病机制。     

核因子кB受体激动子配体和骨保护因子mRNA在慢性根尖周炎病损组织中的表达

目的:探讨核因子кB受体激动子配体(receptor activator of nuclear factor κB ligand,RANKL)和骨保护因子(osteoprotegerin,OPG)在慢性根尖周炎发病中的作用。方法:采用RT-PCR法,从mRNA水平检测RANKL、OPG在10例慢性根尖周肉芽肿和3例根尖周囊肿中的表达。结果:RANKL mRNA在根尖周肉芽肿病损组和根尖周囊肿组明显增高,与正常对照组相比差异均有统计学意义(P<0.05),但根尖周肉芽肿和根尖囊肿组之间差异无显著性(P>0.05)。OPG mRNA仅在两个病损组织中检测到有低水平的表达,其余各病损组织和正常的牙周膜组织中均未检测到OPG mRNA的表达。结论:RANKL和OPG在慢性根尖周炎的发病中具有重要的作用,但也提示存在其他细胞因子的协同作用。     

miR-146a-5p在慢性根尖周炎病损组织中的表达及临床意义

目的:比较慢性根尖周炎病损组织和健康牙周膜组织中miR-146a-5p的相对表达水平,探讨miR-146a-5p在慢性根尖周炎发病中的作用及临床意义。方法:收集16例诊断为慢性根尖周炎患牙的根尖周组织作为病例组,8例因正畸拔除的健康牙的牙周膜作为对照组,采用HE染色检测样本的炎症浸润程度,采用实时荧光定量PCR(real-time PCR,RT-PCR)检测miR-146a-5p的表达。所有数据采用SPSS18.0软件包进行统计学分析。结果:HE染色结果可见对照组中无明显炎症细胞浸润,病损组织中可见大量炎症细胞浸润;RT-PCR实验结果显示,病例组与对照组均有miR-146a-5p的表达,且miR-146a-5p在慢性根尖周炎病损组织中的相对表达量明显高于对照组健康牙周膜组织,差异具有统计学意义(P＜0.05)。结论:miR-146a-5p与慢性根尖周炎的发生发展密切相关。     

氢氧化钙-碘仿糊剂用于乳牙根管封药的临床研究

目的:观察氢氧化钙-碘仿糊剂应用于乳牙感染根管封药的临床疗效。方法:选择320例乳牙根尖周炎病例,随机分为治疗组(氢氧化钙-碘仿糊剂组)和对照组(甲醛甲酚组)各160例,观察封药后48h,1周的临床疗效。结果:1周后两组疗效有显著差异,氢氧化钙-碘仿糊剂根管封药显效率(91.25%)优于甲醛甲酚组(66.25%)。结论:氢氧化钙-碘仿糊剂应用于乳牙根管封药可有效减少治疗期间的肿痛。     

长春地区儿童乳牙急慢性根尖周炎根管内厌氧菌的分析

目的 对长春地区60例儿童急慢性根尖周炎患者的感染根管进行厌氧菌分离鉴定，为指导临床选择用药奠定基础。方法 利用智能化细菌鉴定和药敏系统-ATB快速鉴定仪分离培养和鉴定细菌。结果 98．3％（59／60）的患牙共检出厌氧菌144株，平均每例标本检出2．44株。结论 乳牙急性根尖周炎感染根管内的优势菌以梭杆菌为主，慢性根尖周炎感染根管内的优势菌以放线菌为主。     

Vitapex和碘仿氧化锌丁香油糊剂治疗乳牙尖周炎的疗效对比观察

目的:比较V itapex和碘仿氧化锌丁香油糊剂对乳牙尖周炎的疗效。方法:在心理疏导争取患儿配合的前提下,行常规根管治疗术,采用两种不同的根管糊剂根充,进行疗效对比分析。结果:注射式V itapex根充糊剂与碘仿氧化锌丁香油根充糊剂远期治疗效果有显著差异;乳磨牙的治疗效果差异更为显著。结论:注射式V itapex根充糊剂优于碘仿氧化锌丁香油根充糊剂,更适合作为临床常规乳牙根管充填剂。     

Matrix metalloproteinase-8 (MMP-8) in pulpal and periapical inflammation and periapical root-canal exudates

AIM: To study the presence, levels and molecular forms of matrix metalloproteinase (MMP) -8 (collage-nase-2) in pulpal and periapical inflammation, and the changes in MMP-8 levels in root-canal exudates during root-canal treatment. METHODOLOGY: Periapical exudate samples were collected from 11 necrotic teeth with radiographically verified periapical periodontitis during three root-canal treatment visits with interappointment calcium hydroxide (Ca(OH)2) medication. MMP-8 levels and molecular forms were analyzed with immunofluorescent assay (IFMA) and Western immunoblot. Inflamed pulp tissue and periapical granuloma tissue (n = 10 for both) were obtained from other patients and used for MMP-8 immunohistochemical (IHC) staining. RESULTS: The periapical exudate samples demonstrated marked differences in MMP-8 levels between the teeth in the first visit and significant decrease in MMP-8 levels during the root-canal treatment (P = 0.0107). One specimen failed to show a decrease in MMP-8 below 1000 ng mL(-1) a vertical root fracture was later diagnosed and the tooth extracted. IHC staining showed that in addition to PMN-leucocytes, macrophages and plasma cells produced MMP-8 in pulp and periapical granulomas. CONCLUSIONS: The findings demonstrate the presence of MMP-8 in the inflamed pulp and periapical tissue, indicating that MMP-8 has a role in pulpal and periapical inflammation, most likely participating in tissue extracellular matrix degradation. They further indicate that MMP analysis from periapical exudate could be used to indicate and monitor inflammatory activity and the success of treatment in teeth with periapical lesions.     

Interleukin-17 plays a role in exacerbation of inflammation within chronic periapical lesions

Interleukin (IL)-17 plays an important role in inflammation and certain autoimmune diseases. However, its role in the pathogenesis of chronic dental periapical lesions has not been studied. Periapical lesion mononuclear cells (PL-MNC) were isolated from inflammatory cells and phenotypically analyzed by immunocytochemistry. The cells were cultured in vitro and IL-17 and IL-8 were measured in the culture supernatants. Controls were peripheral blood (PB) MNC. The level of IL-17 and the proportion of neutrophils were significantly higher in symptomatic lesions. In addition, the production of IL-17 was higher in culture supernatants of PL-MNC isolated from lesions with a predominance of T cells, and the IL-17 concentration correlated with the proportion of CD3+ and CD4+ cells. There was a positive correlation between the levels of IL-17 and IL-8 in the group of symptomatic lesions. The relationship between these cytokines was additionally confirmed on the basis of augmented production of IL-8 by both PL-MNC and PB-MNC treated with IL-17. Our results suggest that IL-17, by stimulating the production of IL-8, may play a role in exacerbating inflammation within chronic periapical lesions.     

Differentiation of radicular cyst and granulomas using computerized tomography

Abstract The purpose of this investigation was to study periapical lesions by means of computerized tomography to ascertain if this noninvasive method could be of value in distinguishing between radicular cysts and granulomas. Periapical radiographs were taken of the teeth of 60 human cadavers. Periapical radiolucencies were seen in conjunction with 33 teeth. Based on the periapical radiographs, an oral radiologist (J.P.) attempted to select 4 granulomas and 4 cysts from the 33 radiolucencies. Computerized tomography was performed on the root tips and the periapical lesions of these 8 teeth. The roots and periapical lesions were then surgically removed and prepared histologically for microscopic examination. In the tomographs, 7 of the periapical lesions had a cloudy appearance with a density similar to each other and to the surrounding soft tissue. In the eighth lesion a homogeneous dark area with a distinctly lower density could be distinguished from surrounding cloudy areas. Histologically, the dark area was shown to be an epithelialized cyst cavity. The other 7 lesions were granulomas. Thus, a cyst could be differentiated from periapical granulomas by computerized tomography because of a marked difference in density between the content of the cyst cavity and granulomatous tissue.     

紫花前胡素通过降低OPN表达抑制根尖周炎进程

目的:探讨紫花前胡素对根尖周炎的影响及机制.方法:构建大鼠牙齿根尖周炎用药模型,分为正常对照组、模型观察组和加药处理组,用药处理的大鼠于第1周开始每天腹腔注射紫花前胡素溶液20 mg/kg或等量生理盐水,至第3周末处死.X线及HE染色观察病灶变化;免疫组化检测OPN表达情况.培养并用内毒素及紫花前胡素处理小鼠单核巨噬细...     

Vasoactive intestinal peptide receptor expression in chronic periapical lesions

AIM: To use radioreceptor analysis for evaluating whether vasoactive intestinal peptide (VIP) receptors are present in chronic periapical lesions and to determine whether differences in its expression are found according to the size of the lesions. METHODOLOGY: Twelve periapical lesions were obtained from teeth diagnosed with chronic apical periodontitis and indicated for endodontic surgery; they were classified according to the size of the lesion in two groups of six samples (lesion size greater or smaller than 5 mm), and then processed and labelled with (125)I-VIP. Binding sites were identified by (125)I-VIP and standard VIP competition assays. Mann-Whitney's test was used to establish statistically significant differences in the VIP receptor expression between groups. RESULTS: Vasoactive intestinal peptide receptor expression was found in all periapical lesion samples. There was a statistically significantly higher expression in periapical lesions <5 mm (P < 0.001). CONCLUSION: Vasoactive intestinal peptide receptors were expressed in chronic periapical lesions with levels inversely proportional to lesion size.     

前牙髓腔完全钙化的临床研究

目的：探讨完全钙化根管行根管治疗术的可行性。方法：对26例完全钙化前牙根管行根管治疗术，进行术前术后X线片对比研究。结果：24例顺利完成根管治疗术，2例因根管口完全钙化行根尖手术。结论：完全钙化的前牙根管X线片上显示为根管闭锁，临床上可通过寻找根管口，逐步扩大根管完成根管治疗术，以避免根尖手术或牙拔除术。