【摘要】 目的:观察人甲状旁腺激素1-34(human parathyroid hormone1-34,hPTH1-34)对牙本质的形成和矿化的影响,探讨PTH影响牙本质形成和矿化的机制。方法:切除大鼠甲状旁腺,建立牙本质发育不全的动物模型后,再人工给予不同剂量的hPTH1-34,检测血钙水平的变化,42d后处死大鼠,取下颌切牙制作切片,HE染色,光镜观察并进行图像分析。结果:切除甲状旁腺的大鼠血钙水平下降,牙本质矿化缺陷。在给予hPTH1-34皮下注射后可以检测到血钙水平上调,光镜观察和图像分析结果发现牙本质的形成和矿化发生逆转,10nmol/kg组和20nmol/kg组作用效果优于5nmol/kg组(P<0.05)。结论:PTH可能通过调节血钙或其自身直接作用影响牙本质的形成和矿化。更多还原

【Abstract】 Objective:To study the effects of parathyroid hormone(PTH) upon dentinogenesis by investigating the effects of hPTH1-34 on the development and calcification of parathyroidectomy rats’ dentin. Methods: hPTH1-34 were injected into SD rats at different dosages after parathyroidectomy. Six weeks later lower incisors were dissected and prepared for light microscopy and image analysis. Results:The concentration of serum calcium decreased after parathyroidectomy, while increased after being injected hPTH1-34. The results of light microscopy and image analysis revealed the enlargement of the predentinal tubules and the presence of mineralization defects in the PTX group(P<0.05). These defects were improved after injection of hPTH1-34.The groups of 10 nmol/kg and 20 nmol/kg affected the dentin more than group of 5 nmol/kg(P<0.05). Conclusion:The development and mineralization of dentin can be affected by PTH.更多还原