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目的:研究牙髓炎不同阶段P2X受体家族在大鼠脑干中的表达变化。方法::本实验在大鼠左上颌第一磨牙颌面开髓,并暴露于口腔菌群环境,诱导牙髓炎症。取牙髓炎症第1天、第3天、第7天和第28天时,大鼠双侧脑干的三叉神经脊束核尾端亚核(Vc)和丘脑的腹后中核(VPM),采用免疫组化和免疫荧光方法观察P2X受体家族(P2X1-7受体)的表达模式。结果:实验观察到牙髓炎症第1、3、7天显示急性牙髓炎症的组织学表现,其中第3天最为典型,而第28天显示牙髓坏死和慢性根尖周炎的组织学表现;P2X1-6受体在Vc和VPM中均表达在神经元的胞浆中,而P2X7表达在Vc和VPM中在小胶质细胞中;P2X2,P2X4和P2X7受体在急性牙髓炎症期在同侧Vc中的表达增加;P2X1-5和P2X7的表达都在双侧VPM中均上升,开髓3 d时,对侧VPM中P2X1-5和P2X7的平均表达面积显著高于同侧。结论:除P2X6受体持续高表达外,P2X1-5和P2X7受体均可受到牙髓炎症的诱导,在Vc和VPM中表达增高。  相似文献   
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目的探讨足底注射吗啡对由谷氨酸和天然辣椒碱引起的动物对放射热的逃避行为的影响,从而了解阿片和谷氨酸受体在末梢神经痛觉传递中的相互作用。方法120只健康SD雄性大鼠随机分为12组,每组10只。在大鼠后肢左侧足底分别注射(正常对照组不用药)、生理盐水组(saline组)、谷氨酸组(Glu组)、天然辣椒碱组(Cap组)、吗啡组(Mor组)、盐酸纳洛酮组(NLX组)、谷氨酸牟吗啡组(Glu+Mor组)、谷氨酸+盐酸纳洛酮组(Glu+NLX组)、谷氨酸+盐酸纳洛酮+吗啡组(Glu+NLX+Mor组)、天然辣椒碱+吗啡组(Cap+Mor组)、天然辣椒碱+盐酸纳洛酮组(Cap+NLX组)、天然辣椒碱+盐酸纳洛酮+吗啡组(Cap+NLX+Mor组);注射药物15min,1、2、3、4、5、6h后分别观察SD雄性大鼠双足温度逃避域值的变化。结果大鼠双足逃避域值的变化,正常对照组左足的温度逃避域值为(11.7±0.29)s,右足的温度逃避域值为(11.5±0.4)s,两者的比为100%;saline组、Mor组、NLX组左右足的温度逃避域值比均为100%,3组比较差异无统计学意义(P〉0.05);Cap组最大减少幅度发生在15~180min之间[150nmol为(66.4±3.9)%;300nmol为(70±4.3)%],与saline组比较差异有统计学意义(P〈0.05);Glu组最大减少幅度发生在15~120min之间[1.5μmol为(85.9±1.3)%,5±mol为(78.7±2.7)%],与saline组比较差异有统计学意义(P〈0.05);Glu+Mor组逃避域值比最大值为(130±4)%,显著高于G1u组(P〈0.05);Glu+NLX+Mor组最大值为(81±6)%,低于Glu+Mor组(P〈0.05);Cap+Mot最大值为(203±10)%,显著高于Cap组(P〈0.05);Cap+NLX+Mor组最大值为(89±9)%,低于Cap+Mor组(P〈0.05)。结论谷氨酸受体参与末梢神经痛觉传递,激活阿片受体可以阻止外源性和内  相似文献   
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目的:iRoot BP Plus直接盖髓于比格犬牙颈部,观察术后损伤部位钙化桥的形成程度和牙髓炎症反映情况,探索iRoot BP Plus作为直接盖髓材料的可行性。方法:选取2只10月龄健康比格犬,选择72颗牙齿作为研究对象,8周和12周实验周期,随机分为iRoot BP Plus组、MTA组和玻璃离子实验对照组,分别以iRoot BP Plus、MTA及玻璃离子盖髓。术后8周和12周分别拔出实验牙,获取标本,组织学切片,苏木精-伊红(HE)染色,将标本牙髓内钙化桥形成程度和牙髓内炎症反应程度进行组织学评估并分级,统计学分析采用秩和检验。结果:8周和12周后iRoot BP Plus组和MTA组大多数标本可形成完整钙化桥,牙髓无炎症,但MTA组使牙齿变色,而iRoot BP Plus组不使牙齿变色;玻璃离子组标本均无钙化桥形成,牙髓均有炎症反应及网状萎缩和成牙本质细胞空泡变性,但不使牙齿变色。结论:1)iRoot BP Plus、MTA都能诱导钙化桥形成。2)iRoot BP Plus、MTA都具有良好的炎症调节作用。3)iRoot BP Plus是一种优于MTA 的盖髓剂。  相似文献   
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口服尼群地平片所致牙龈增生1例   总被引:1,自引:0,他引:1  
笔者收治一例口服尼群地平片所致牙龈增生,报告如下。患者,女,51岁。因全口牙龈肿胀数年,近日进食牙龈出血,口服螺旋霉素三日无效来我院就诊。自述有高血压病史和长期口服尼群地平片病史10年。临床检查∶T37℃,P74次/分,R22次/分,BP140/100mmHg,全身状况良好。口腔检查可见∶唇  相似文献   
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1. We examined the effects of L-Glutamic acid (Glu), a NMDA receptor antagonist, D-2-amino-5-phosphonopentanoate (D-AP5) as well as a selective Group I mGluR antagonist, 7-Hydroyiminocyclo propan[a]chromen-1a- carboxylic acid ethyl ester (cpccoEt ), on c-fos-like immunoreactivity (c-fos LI) within the L5 spinal cord dorsal horn of urethane anaesthetized Sprague-Dawley rats, in which L5-L6 nerves were ligated to produce neuropathic pain model (SNL model), two weeks after the operation, rats were adopted. 2. In SNL rats, nerve ligation with no drug use resulted in an increase in the level of c-Fos expression in two sides of spinal cord, particularly, in III/IV of ligated side. Intraplantar or intrathecal administration of saline significantly increased the c-Fos labeled neurons in I/II of ligated side compared with ligated group without saline administration, there was no difference between intraplantar and intrathecal administration of saline in I/II of ligated side. 3. On the other hand, either intraplantar or intrathecal administration, glutamate (5 mol) could significantly increase the number of c-Fos positive neurons compared with saline group value in intact, sham-operated and SNL rats; when intrathecal administration of glutamate into SNL rats, the number of c-Fos positive neurons in I/II of ligated side was three times higher than that induced by intraplantar administration; however, there was no difference between in I/II of ligated and of unligated side in the level of c-Fos expression induced by intrathecal administration. In addition, the number of c-Fos positive neurons in I/II of ligated side induced by intrathecal administration of glutamate in SNL rats was two times higher than in sham-operated rats. 4. There was no difference among saline group, D-AP5 (50 nmol) group and cpccoEt (250 nmol) group in the number of c-fos LI cells either in sham-operated or in SNL rats, respectively; In addition, the number of c-Fos positive neurons in I/II ipisilateral side induced by saline or D-AP5 in SNL rats was three times higher than that in sham-operated rats, by cpccoEt in SNL rats was two times higher than that in sham-operated rats. However, glutamate (5 mol) combined with D-AP5 (50 nmol) or cpccoEt (250 nmol), intrathecal administration, the number of c-Fos positive neurons either in sham-operated or SNL rats was less than glutamate group value, thus, D-AP5 significantly reduced labeled cells in I/II layer induced by glutamate by a maximum of 69.5% in the left side and 72.1% in the right side in sham-operated rats, of 71.6% in ligated side and 70.6% in unligated side, respectively; cpccoEt significantly decreased the number of c-fos LI cells by glutamate by a maximum of 71.8% in the left side and 71.7% in the right side in sham-operated rats, of 72.4% in the ligated side and 90.1% in the unligated side, respectively. 5. Taken together, c-Fos expression may be associated with different pass-way of excitation of nerve. These results suggest that nerve ligation might be able to influence c-Fos expression; saline and glutamate progressively promote the c-Fos expression in SNL rats; blockade of NMDA receptors, group I mGluRs decrease the response of peripheral and spinal cord neurons to glutamate.  相似文献   
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第3磨牙近中倾斜位阻生是导致后磨牙食物嵌塞的主要原因之一,如果不作早期预防性治疗,容易引起因食物潴留而导致第2和第3磨牙同时龋坏,因食物嵌塞而导致第2和第3磨牙间的牙龈充血、溃疡从而形成慢性牙龈炎,口腔出现异味等。为防止以上现象的产生,作者设计了一种整体铸造金属冠加远中殆支托修复间隙以治疗食物嵌塞,取得较好效果。  相似文献   
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目的探讨星状神经节阻滞(SGB)治疗阻生齿拔除术诱发下唇麻痹后疗效。方法病程在1个月以内60例患者随机分为Ⅰ、Ⅱ组,病程在3个月至1年的患者60例随机分为Ⅲ、Ⅳ组,各组均为30例;Ⅰ、Ⅲ组采用SGB治疗,Ⅱ、Ⅳ组采用SGB和电针灸疗法治疗。结果经过12次SGB治疗后,Ⅰ组28例恢复正常,2例良好;Ⅱ组26例恢复正常,4例良好;2组优良率比较差异无统计学意义(P〉0.05)。经过18次SGB治疗后,Ⅲ组24例恢复正常,5例良好,1例无效;Ⅳ组23例恢复正常,6例良好,1例无效;2组优良率比较差异无统计学意义(P〉0.05)。结论阻生齿拔除术诱发下唇麻痹后,应尽早进行治疗,SGB是其理想的治疗方法之一,电针灸可起到辅助治疗作用。  相似文献   
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目的探讨足底注射吗啡对谷氨酸和天然辣椒碱所引起的大鼠脊髓背角c-Fos蛋白表达的影响,从而了解阿片和谷氨酸受体在末梢神经痛觉传递中的相互作用。方法72只健康SD雄性大鼠,随机分为12组,每组6只。在大鼠后肢左侧足底分别注射(正常对照组不用药)生理盐水(Saline组)、谷氨酸(Glu组)、天然辣椒碱(Cap组)、吗啡(MOR组)、盐酸纳洛酮(NLX组)、谷氨酸+吗啡(Glu+MOR组)、谷氨酸+盐酸纳洛酮(Glu+NLX组)、谷氨酸+盐酸纳洛酮+吗啡(Glu+NLX+MOR组)、天然辣椒碱+吗啡(Cap+MOR组)、天然辣椒碱+盐酸纳洛酮(Cap+NLX组)、天然辣椒碱+盐酸纳洛酮+吗啡(Cap+NLX+MOR组);注射药物2 h后对脊髓(L4-5)背角出现的c-Fos阳性神经细胞的数量进行观察。结果在脊髓(L4-5)背角浅层的c-Fos阳性神经细胞数,正常对照组为0个;Saline组、MOR组、NLX组分别为(60±5)、(50±14)、(67±22)个,3组比较差异无统计学意义(P〉0.05);Glu组、Cap组分别为(268±21)(、489±34)个,与Saline组比较差异有统计学意义(P〈0.01);Glu+MOR组为(65±10)个,较Glu组明显减少(P〈0.05);Glu+NLX+MOR组为(321±33)个,较Glu+MOR组明显增加(P〈0.05);Cap+MOR组为(259±52)个,较Cap组明显减少(P〈0.05);Cap+NLX+MOR组为(491±44)个,较Cap+MOR组明显增加(P〈0.05)。结论谷氨酸受体参与脊髓背角浅层c-Fos蛋白表达,吗啡激活阿片受体可以导致外源性和内源性谷氨酸所引起的c-Fos阳性蛋白的减少,而盐酸纳洛酮可以拮抗吗啡的这种作用。  相似文献   
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随着成年正畸患者比例的增加,牙周状况对正畸治疗效果的影响以及正畸治疗与牙周支持组织改建的关系逐渐成为焦点。越来越多的正畸医师意识到,正畸治疗前牙周炎症应得到有效控制。牙周炎可增加正畸治疗的难度,导致额外的牙槽骨吸收;因此,降低牙周炎患者在正畸治疗过程中牙周组织健康状况恶化的风险成为临床医师关注的重点。除牙周炎外,正畸治疗也有可能导致牙龈退缩。另外,正畸治疗中应考虑特定类型的牙槽骨缺损情况:如骨开窗、骨开裂与正畸牙移动的关系。本文主要从牙周炎与正畸、牙龈退缩与正畸以及骨开窗和(或)骨开裂与正畸三方面阐述正畸治疗中牙周支持组织的风险考量。  相似文献   
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