To investigate the feasibility of implanting the biocomposite of calcium phosphate cement(CPC)/polylactic acid-polyglycolic acid(PLGA) into animals for bone defects repairing,the biocomposite of CPC/PLGA was prepared ...To investigate the feasibility of implanting the biocomposite of calcium phosphate cement(CPC)/polylactic acid-polyglycolic acid(PLGA) into animals for bone defects repairing,the biocomposite of CPC/PLGA was prepared and its setting time,compressive strength,elastic modulus,pH values,phase composition of the samples,degradability and biocompatibility in vitro were tested.The above-mentioned composite implanted with bone marrow stromal cells was used to repair defects of the radius in rabbits.Osteogenesis was histomorphologically observed by using an electron-microscope.The results show that compared with the CPC,the physical and chemical properties of CPC/PLGA composite have some differences in which CPC/PLGA composite has better biological properties.The CPC/PLGA composite combined with seed cells is superior to the control in terms of the amount of new bones formed after CPC/PLGA composite is implanted into the rabbits,as well as the speed of repairing bone defects.The results suggest that the constructed CPC/PLGA composite basically meets the requirements of tissue engineering scaffold materials and that the CPC/PLGA composite implanted with bone marrow stromal cells may be a new artificial bone material for repairing bone defects because it can promote the growth of bone tissues.展开更多
目的:在微型计算机断层扫描(micro-computed tomography,Micro-CT)指导下,依据牙槽骨解剖特征建立大鼠单根牙牙槽骨缺损模型,确定兴趣区范围与定量指标,建立具有可重复性和可比性的大鼠单根牙牙槽骨缺损修复分析方法,并验证其可行性。方...目的:在微型计算机断层扫描(micro-computed tomography,Micro-CT)指导下,依据牙槽骨解剖特征建立大鼠单根牙牙槽骨缺损模型,确定兴趣区范围与定量指标,建立具有可重复性和可比性的大鼠单根牙牙槽骨缺损修复分析方法,并验证其可行性。方法:选取5月龄雄性大鼠15只,随机分为3组:解剖分析组,用于通过Micro-CT确定缺损位置和尺寸;空白对照组(Control)和引导骨再生(guided bone regeneration,GBR)实验组用于验证模型和评价方法可行性。在上颌第一磨牙区制备直径2 mm×深度2 mm缺损,通过Micro-CT分析量化颊侧骨高度丢失(buccal bone height loss,BBHL)和缺损区域新生骨及骨微结构。结果:成功建立了SD大鼠的标准牙槽骨缺损模型,未损伤相邻牙齿且缺损区域颊侧骨壁厚度为(0.36±0.06)mm。术后8周,GBR组较Control组中间点、最低点BBHL和骨小梁距离显著减少(P<0.05),骨体积分数显著增加(P<0.05),骨小梁厚度及数量也较Control组有所改善。结论:在Micro-CT指导下建立了标准化的大鼠牙槽骨缺损模型用于模拟临床单根牙缺损以及缺损修复的评价方法,该方法具有可重复性,为牙槽嵴保存技术和骨再生材料开发提供了可靠的临床前评估工具。展开更多
基金Projects(30370412, 30670558) supported by the National Natural Science Foundation of China
文摘To investigate the feasibility of implanting the biocomposite of calcium phosphate cement(CPC)/polylactic acid-polyglycolic acid(PLGA) into animals for bone defects repairing,the biocomposite of CPC/PLGA was prepared and its setting time,compressive strength,elastic modulus,pH values,phase composition of the samples,degradability and biocompatibility in vitro were tested.The above-mentioned composite implanted with bone marrow stromal cells was used to repair defects of the radius in rabbits.Osteogenesis was histomorphologically observed by using an electron-microscope.The results show that compared with the CPC,the physical and chemical properties of CPC/PLGA composite have some differences in which CPC/PLGA composite has better biological properties.The CPC/PLGA composite combined with seed cells is superior to the control in terms of the amount of new bones formed after CPC/PLGA composite is implanted into the rabbits,as well as the speed of repairing bone defects.The results suggest that the constructed CPC/PLGA composite basically meets the requirements of tissue engineering scaffold materials and that the CPC/PLGA composite implanted with bone marrow stromal cells may be a new artificial bone material for repairing bone defects because it can promote the growth of bone tissues.
文摘目的:在微型计算机断层扫描(micro-computed tomography,Micro-CT)指导下,依据牙槽骨解剖特征建立大鼠单根牙牙槽骨缺损模型,确定兴趣区范围与定量指标,建立具有可重复性和可比性的大鼠单根牙牙槽骨缺损修复分析方法,并验证其可行性。方法:选取5月龄雄性大鼠15只,随机分为3组:解剖分析组,用于通过Micro-CT确定缺损位置和尺寸;空白对照组(Control)和引导骨再生(guided bone regeneration,GBR)实验组用于验证模型和评价方法可行性。在上颌第一磨牙区制备直径2 mm×深度2 mm缺损,通过Micro-CT分析量化颊侧骨高度丢失(buccal bone height loss,BBHL)和缺损区域新生骨及骨微结构。结果:成功建立了SD大鼠的标准牙槽骨缺损模型,未损伤相邻牙齿且缺损区域颊侧骨壁厚度为(0.36±0.06)mm。术后8周,GBR组较Control组中间点、最低点BBHL和骨小梁距离显著减少(P<0.05),骨体积分数显著增加(P<0.05),骨小梁厚度及数量也较Control组有所改善。结论:在Micro-CT指导下建立了标准化的大鼠牙槽骨缺损模型用于模拟临床单根牙缺损以及缺损修复的评价方法,该方法具有可重复性,为牙槽嵴保存技术和骨再生材料开发提供了可靠的临床前评估工具。
