As a 3D micro-nano material, layered double hydroxides have been widely used in many fields, especially for reinforced composite materials. In this paper, Li Al-LDHs was obtained by a hydrothermal method. In order to ...As a 3D micro-nano material, layered double hydroxides have been widely used in many fields, especially for reinforced composite materials. In this paper, Li Al-LDHs was obtained by a hydrothermal method. In order to investigate the effects of Li Al-LDHs on the early hydration of calcium sulphoaluminate（CSA） cement paste, compressive strength, setting time and hydration heat were tested while X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR）, scaning electron microscopy（SEM） and differential scanning calorimetry（DSC） analysis were employed. The results indicated that Li Al-LDHs could significantly improve the early compressive strength and shorten the setting time of calcium sulphoaluminate cement paste with 3 wt% concentration. Besides, the hydration exothermic rate within 5h was accelerated with increasing Li Al-LDHs content. Moreover, the addition of Li Al-LDHs did not result in the formation of a new phase, but increased the quantity of hydration products providing higher compressive strength, shorter setting time and denser microstructure.展开更多
目的:分析iRoot BP Plus活髓切断术对年轻恒牙牙根发育状态的影响。方法:选取2021年1月~2025年1月我院收治的60例年轻恒牙外伤患者作为研究对象,按随机数字表法分为iRoot组和传统组,各30例。传统组采用传统活髓切断术,iRoot组采用iRoot ...目的:分析iRoot BP Plus活髓切断术对年轻恒牙牙根发育状态的影响。方法:选取2021年1月~2025年1月我院收治的60例年轻恒牙外伤患者作为研究对象,按随机数字表法分为iRoot组和传统组,各30例。传统组采用传统活髓切断术,iRoot组采用iRoot BPPlus活髓切断术。对比两组疗效、视觉模拟评分法(Visual analogue scale,VAS)、咀嚼功能、牙周指标[牙周袋深度(Pocket depth,PD)、牙龈指数(Gingival index,GI)、龈沟出血指数(Sulcus bleeding index,SBI)]、不良反应、家属满意度。结果:iRoot组治疗总有效率和牙齿色泽满意度、咬合度满意度、整体美观满意度得分均明显高于传统组(P<0.05)。治疗后,两组VAS评分、咀嚼功能评分、PD、GI、SBI均明显降低,且iRoot组明显较传统组低(P<0.05)。iRoot组不良反应发生率明显低于传统组(P<0.05)。结论:iRoot BP Plus活髓切断术治疗年轻恒牙外伤患者可改善疼痛、咀嚼及牙周指标,减少不良反应,提高家属满意度。展开更多
基金Funded by the National Natural Sciense Foundation of China(No.51272068)
文摘As a 3D micro-nano material, layered double hydroxides have been widely used in many fields, especially for reinforced composite materials. In this paper, Li Al-LDHs was obtained by a hydrothermal method. In order to investigate the effects of Li Al-LDHs on the early hydration of calcium sulphoaluminate（CSA） cement paste, compressive strength, setting time and hydration heat were tested while X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR）, scaning electron microscopy（SEM） and differential scanning calorimetry（DSC） analysis were employed. The results indicated that Li Al-LDHs could significantly improve the early compressive strength and shorten the setting time of calcium sulphoaluminate cement paste with 3 wt% concentration. Besides, the hydration exothermic rate within 5h was accelerated with increasing Li Al-LDHs content. Moreover, the addition of Li Al-LDHs did not result in the formation of a new phase, but increased the quantity of hydration products providing higher compressive strength, shorter setting time and denser microstructure.
