计算机辅助设计导板修复上颌后种植体头部和角度偏离不影响 种植体的植入精度

BACKGROUND: Maxillary posterior tooth defects can be repaired using the dental implant. However, implantation accuracy is not ensured by traditional plaster models used as implant template, which leads to the incidence of complications, and affects the repair effects. OBJECTIVE: To study application effects of surgical guide plates designed using the computer aided design (CAD)/computer aided manufacturing (CAM) technology for the repair of maxillary posterior tooth defects. METHODS: Implant treatment was performed in 30 patients with maxillary posterior tooth defects. Surgical guide plate was made using the CAD/CAM technology after CT scan of the jaw bone. The repair was conducted with guide plate assistant. The deviation between the virtual and actual implant position was measured after implantation. The clinical repair effects and periodontal tissues were observed during the 12-month follow-up. RESULTS AND CONCLUSION: Thirty-six CAD/CAM surgical guide plates in 30 patients were stabilized after implantation. Thirty-six implants were emplaced precisely with the assist of the surgical guide plates. There was no any problem during the process of implantation. The deviation of the head between the virtual and actual implant position was very small, which did not affect the accuracy of implant placement. Before and 6 and 12 months after the repair, gingival crevicular fluid, tumor necrosis factor-α, and sulcus bleeding index were not obviously changed in the patients. Our results suggest that the implant head deviation and angle deviation appear during the repair process of maxillary posterior tooth defects using CAD/CAM surgical guide for dental implants; however, the implantation accuracy is not affected. The repair effect is ideal and periodontal tissue is in good status after implantation. 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

美洲大蠊提取物黏糖氨酸对肝纤维化模型大鼠的影响及机制

BACKGROUND:Hepatic fibrosis in chronic liver disease can be reversed. Studies have shown that Periplaneta americana extract has anti-fibrosis effect, and has protective effect on the experimental hepatic fibrosis rats. OBJECTIVE:To observe the effect of Periplaneta americana extract sticky sugar amino acid on hepatic fibrosis, and to primarily explore the mechanism of sticky sugar amino acid against hepatic fibrosis. METHODS:Rat models of immune hepatic fibrosis were induced by pig serum and intragastrically administered 0.5, 0.25, 0.10 g/kg sticky sugar amino acid. Four indexes of hepatic fibrosis were detected by radioimmunoassay. Immunohistochemical staining was used to measure transforming growth factor beta 1, tissue inhibitor of metalloproteinase protein expression intensity and positive cell rate, to determine the correlation of different concentrations of sticky sugar amino acid, transformation growth factor beta 1 and tissue inhibitor of metalloproteinase.  RESULTS AND CONCLUSION: (1) The Periplaneta americana extract sticky sugar amino acid reduced the levels of laminin, type III procollagen, type IV collagen and hyaluronidase (P < 0.01) and reduced the expression of transformation growth factor beta 1 and tissue inhibitor of metalloproteinase 1 in liver tissue (P < 0.01). (2) Sticky sugar amino acid concentration and transformation growth factor beta 1 and tissue inhibitor of metalloproteinase 1 protein expression showed a significant negative correlation (| r | > 0.9). (3) Results confirmed that the Periplaneta americana extract sticky sugar amino acid can change the reversal of hepatic fibrosis. Its mechanism of action is associated with expression of transforming growth factor beta 1 and tissue inhibitor of metalloproteinase 1 inhibited by sticky sugar amino acids.     

艾滋病合并乙型肝炎患者乙肝病毒血清学与HBV-DNA的关系

目的 分析艾滋病合并乙型肝炎患者乙肝病毒血清学标志物(HBV-M)水平与HBV-DNA之间的关系.方法 采用荧光定量聚合酶链反应(FQ PCR)技术和时间分辨荧光免疫法(TRFIA)检测64例HIV/HBV合并感染者的乙肝病毒血清学标志物和HBV-DNA水平,结果 HBsAg+HBeAg+HBcAb组和HBsAg+HBeAg组的HBV-DNA阳性检出率分别为70.59％和100％,显著高于其他血清学标志物模式(P＜0.05),且HBeAg阳性组中HBV-DNA阳性率也显著高于HBeAg阴性组(P＜0.05).HBsAg含量在不同的HBV-DNA水平中总体有差异,两两比较发现在HBV-DNA＜3 copies/mL组与HBV-DNA 5 copies/mL组之间有统计学差异,HBsAg含量在高病毒复制组中显著高于HBV-DNA阴性组(P＜0.05),但HBsAg含量在HBV-DNA中低水平之间无统计学差异(P＞0.05).同样,HBsAg定量在不同HBV血清学标志物模式中总体有差异,通过两两比较,病毒复制活跃的HBsAg+HBeAg+HBcAb组HBsAg含量显著高于HBsAg+HBeAb+HBcAb组(P＜0.05),而其他血清学标志物模式之间没有明显的差异.经直线回归分析,HBV-DNA与HBsAg之间存在正相关(回归系数=0.244＞0),当HBsAg＞3.24 lgng/mL,即出现HBV-DNA阳性.结论 HBeAg在HIV/HBV合并感染者中可作为HBV复制活跃的标志之一,但须同时监测HBV-DNA水平,以评估病情的变化和指导临床诊疗.同样,HBsAg含量与HBV-DNA复制水平有关,HBV复制越活跃,HBsAg的含量也越高,二者相关性越好,但临床上单用HBsAg定量结果来评价HIV/HBV合并感染者HBV-DNA水平有其局限性,需具体结合HBV-DNA定量值和临床综合评价患者病情和疗效.