Resorption and loss of alveolar bone leads to oral dysfunction and loss of natural or implant teeth. Biomimetic delivery of growth factors based on stem cell recruitment and osteogenic differentiation, as the key step...Resorption and loss of alveolar bone leads to oral dysfunction and loss of natural or implant teeth. Biomimetic delivery of growth factors based on stem cell recruitment and osteogenic differentiation, as the key steps in natural alveolar bone regenerative process, has been an area of intense research in recent years. A mesoporous self-healing hydrogel(DFH) with basic fibroblast growth factor(bFGF) entrapment and transforming growth factor β3(TGFβ3)-loaded chitosan microspheres(CMs) was developed. The formulation was optimized by multiple tests of self-healing, in-bottle inversion, SEM, rheological, swelling rate and in vitro degradation. In vitro tubule formation assays, cell migration assays, and osteogenic differentiation assays confirmed the ability of DFH to promote blood vessels, recruit stem cells, and promote osteogenic differentiation. The optimum DFH formula is 0.05 ml 4ArmPEG-DF(20%) added to 1 ml CsGlu(2%) containing bFGF(80 ng) and TGFβ3-microspheres(5 mg). The results of in vitro release studied by Elisa kit, indicated an 95% release of b FGF in7 d and long-term sustained release of TGFβ3. For alveolar defects rat models, the expression levels of CD29 and CD45, the bone volume fraction, trabecular number, and trabecular thickness of new bone monitored by Micro-CT in DFH treatment groups were significantly higher than others(*P < 0.05, vs Model). HE and Masson staining show the same results.In conclusion, DFH is a design of bionic alveolar remodelling microenvironment, that is in early time microvessels formed by b FGF provide nutritious to recruited endogenous stem cells, then TGFβ3 slowly released speed up the process of new bones formation to common facilitate rat alveolar defect repair. The DFH with higher regenerative efficiency dovetails nicely with great demand due to the requirement of complicated biological processes.展开更多
Currently, the most commonly used treatment methods for repairing alveolar furcation defects are periodontal guided tissue regeneration （GTR） and bone grafting. The objective of this study was to investigate the eff...Currently, the most commonly used treatment methods for repairing alveolar furcation defects are periodontal guided tissue regeneration （GTR） and bone grafting. The objective of this study was to investigate the effects of simvastatin/methylcellulose gel on bone regeneration in alveolar defects in miniature pigs. Methods Alveolar defects were produced in 32 teeth （the third and fourth premolars） of 4 miniature pigs. The 32 experimental teeth were divided into 5 groups comprising control （C） and treatment （T） teeth： （1） empty defects without gel （group CO, n=4）; （2） defects injected with methylcellulose gel （group C1, n=4）; （3） defects injected with 0.5 rag/50 pl simvastatin/methylcellulose gel （group T1, n=8）; （4） defects injected with 1.5 mg/50 μl simvastatin/methylcellulose gel （group T2, n=8）; and （5） defects injected with 2.2 mg/50 μl simvastatin/methylcellulose gel （group T3, n=8）. Every week after surgery, the furcation sites were injected once with gel. At the eighth week afte（ surgery, the 4 pigs were sacrificed and underwent macroscopic observation, descriptive histologic examination, and regenerate bone quantitative histologic examination. Results At 8 weeks after surgery, the defect sites in the treatment groups were completely filled in with new bone and fibrous tissue. There was little new bone in the CO and C1 groups, and only a small number of osteoblasts and proliferative vessels could be seen on microscopic examination. Conclusions Miniature pigs are an ideal experimental animal for establishing a model of alveolar defects using a surgical method. Local application of simvastatin/methylcellulose gel can stimulate the regeneration of alveolar bone in furcation defect sites, because it promotes the proliferation of osteoblasts. The best dose of simvastatin gel to stimulate bone regeneration is 0.5 mg.展开更多
背景:对于牙槽骨缺损的再生修复,研究一种促进牙槽骨再生且具有良好性能的材料,对于治疗牙槽骨缺损有着重要意义。目的:汇总近5年有关牙槽骨缺损再生修复的研究,对新材料和新药物进行分类介绍,从而掌握相关领域的最新进展。方法:以“Alv...背景:对于牙槽骨缺损的再生修复,研究一种促进牙槽骨再生且具有良好性能的材料,对于治疗牙槽骨缺损有着重要意义。目的:汇总近5年有关牙槽骨缺损再生修复的研究,对新材料和新药物进行分类介绍,从而掌握相关领域的最新进展。方法:以“Alveolar bone,alveolar bone defect,alveolar bone regeneration,mechanism,biomaterials,nanoscaffolds,hydrogels,medications,anti-inflammatory drugs,simvastatin,metformin,traditional Chinese medicine,growth factor,stem cell”为英文关键词在PubMed数据库检索,以“牙槽骨,牙槽骨缺损,牙槽骨再生,机制,生物材料,纳米支架,水凝胶,药物治疗,抗炎药物,辛伐他汀,二甲双胍,中药,生长因子,干细胞”为中文关键词在中国知网进行检索,通过筛选最终共得到117篇文献进行综述分析。结果与结论:生物材料的应用既为牙槽骨再生提供支架结构,也可以作为骨替代物修复骨缺损;西药和中药的局部与全身应用可以控制炎症,促进骨再生;负载有各种生长因子的材料具有成骨作用,可以促进牙槽骨缺损的修复;干细胞组织工程的种子细胞具有成骨、成纤维的作用,可以分化为成骨细胞,生成新生骨质。近几年的研究热衷于对以上几种方法的结合使用,研发出新的具有良好生物相容性、可缓慢释放功能药物或材料,来促进牙槽骨缺损的再生修复。展开更多
目的:探讨3D打印个性化钛网的引导骨再生(guided bone regeneration,GBR)术及富血小板纤维蛋白(platelet-rich fibrin,PRF)/Bio-Oss复合物修复牙槽骨缺损的应用。方法:纳入2021年3月至2024年2月于甘肃省中医院口腔颌面外科行GBR骨增量...目的:探讨3D打印个性化钛网的引导骨再生(guided bone regeneration,GBR)术及富血小板纤维蛋白(platelet-rich fibrin,PRF)/Bio-Oss复合物修复牙槽骨缺损的应用。方法:纳入2021年3月至2024年2月于甘肃省中医院口腔颌面外科行GBR骨增量手术的牙槽骨缺损患者68例,随机分为3D组(n=34)与传统组(n=34),3D组使用3D打印个性化钛网及PRF/BioOss复合物,传统组使用传统钛网及PRF/Bio-Oss复合物。对比2组术后2、4、6个月的牙槽骨增加高度、宽度、体积及并发症发生率。结果:3D组术后2、4、6个月的牙槽骨增加高度、宽度与传统组相比,但差异均无统计学意义(P>0.05)。3D组术后2个月、4个月的牙槽骨增加体积均高于传统组,但差异均无统计学意义(P>0.05),术后6个月时牙槽骨增加体积显著高于传统组(P<0.05)。3D组发生早期暴露、晚期暴露、总暴露、创口感染的比例均低于传统组,但差异均无统计学意义(P>0.05)。结论:3D打印个性化钛网及PRF/Bio-Oss复合物的GBR术修复牙槽骨缺损效果良好,术后6个月骨增加体积显著高于应用传统钛网的GBR术,且不影响其安全性,值得临床推广应用。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supported by grants from the Guangzhou Science and Technology Program Key Project(Grant No.201803010044)Guangdong Province College Characteristic Innovation Project(2019KTSCX011)+2 种基金Guangdong Province Natural Sciences Fund Project(2021A1515012480)the Key Areas Research and Development Program of Guangzhou(202103030003)Guangdong Province Special Fund Projects(Yueziranzihe,2021,No.50).
文摘Resorption and loss of alveolar bone leads to oral dysfunction and loss of natural or implant teeth. Biomimetic delivery of growth factors based on stem cell recruitment and osteogenic differentiation, as the key steps in natural alveolar bone regenerative process, has been an area of intense research in recent years. A mesoporous self-healing hydrogel(DFH) with basic fibroblast growth factor(bFGF) entrapment and transforming growth factor β3(TGFβ3)-loaded chitosan microspheres(CMs) was developed. The formulation was optimized by multiple tests of self-healing, in-bottle inversion, SEM, rheological, swelling rate and in vitro degradation. In vitro tubule formation assays, cell migration assays, and osteogenic differentiation assays confirmed the ability of DFH to promote blood vessels, recruit stem cells, and promote osteogenic differentiation. The optimum DFH formula is 0.05 ml 4ArmPEG-DF(20%) added to 1 ml CsGlu(2%) containing bFGF(80 ng) and TGFβ3-microspheres(5 mg). The results of in vitro release studied by Elisa kit, indicated an 95% release of b FGF in7 d and long-term sustained release of TGFβ3. For alveolar defects rat models, the expression levels of CD29 and CD45, the bone volume fraction, trabecular number, and trabecular thickness of new bone monitored by Micro-CT in DFH treatment groups were significantly higher than others(*P < 0.05, vs Model). HE and Masson staining show the same results.In conclusion, DFH is a design of bionic alveolar remodelling microenvironment, that is in early time microvessels formed by b FGF provide nutritious to recruited endogenous stem cells, then TGFβ3 slowly released speed up the process of new bones formation to common facilitate rat alveolar defect repair. The DFH with higher regenerative efficiency dovetails nicely with great demand due to the requirement of complicated biological processes.
文摘Currently, the most commonly used treatment methods for repairing alveolar furcation defects are periodontal guided tissue regeneration （GTR） and bone grafting. The objective of this study was to investigate the effects of simvastatin/methylcellulose gel on bone regeneration in alveolar defects in miniature pigs. Methods Alveolar defects were produced in 32 teeth （the third and fourth premolars） of 4 miniature pigs. The 32 experimental teeth were divided into 5 groups comprising control （C） and treatment （T） teeth： （1） empty defects without gel （group CO, n=4）; （2） defects injected with methylcellulose gel （group C1, n=4）; （3） defects injected with 0.5 rag/50 pl simvastatin/methylcellulose gel （group T1, n=8）; （4） defects injected with 1.5 mg/50 μl simvastatin/methylcellulose gel （group T2, n=8）; and （5） defects injected with 2.2 mg/50 μl simvastatin/methylcellulose gel （group T3, n=8）. Every week after surgery, the furcation sites were injected once with gel. At the eighth week afte（ surgery, the 4 pigs were sacrificed and underwent macroscopic observation, descriptive histologic examination, and regenerate bone quantitative histologic examination. Results At 8 weeks after surgery, the defect sites in the treatment groups were completely filled in with new bone and fibrous tissue. There was little new bone in the CO and C1 groups, and only a small number of osteoblasts and proliferative vessels could be seen on microscopic examination. Conclusions Miniature pigs are an ideal experimental animal for establishing a model of alveolar defects using a surgical method. Local application of simvastatin/methylcellulose gel can stimulate the regeneration of alveolar bone in furcation defect sites, because it promotes the proliferation of osteoblasts. The best dose of simvastatin gel to stimulate bone regeneration is 0.5 mg.
文摘背景:对于牙槽骨缺损的再生修复,研究一种促进牙槽骨再生且具有良好性能的材料,对于治疗牙槽骨缺损有着重要意义。目的:汇总近5年有关牙槽骨缺损再生修复的研究,对新材料和新药物进行分类介绍,从而掌握相关领域的最新进展。方法:以“Alveolar bone,alveolar bone defect,alveolar bone regeneration,mechanism,biomaterials,nanoscaffolds,hydrogels,medications,anti-inflammatory drugs,simvastatin,metformin,traditional Chinese medicine,growth factor,stem cell”为英文关键词在PubMed数据库检索,以“牙槽骨,牙槽骨缺损,牙槽骨再生,机制,生物材料,纳米支架,水凝胶,药物治疗,抗炎药物,辛伐他汀,二甲双胍,中药,生长因子,干细胞”为中文关键词在中国知网进行检索,通过筛选最终共得到117篇文献进行综述分析。结果与结论:生物材料的应用既为牙槽骨再生提供支架结构,也可以作为骨替代物修复骨缺损;西药和中药的局部与全身应用可以控制炎症,促进骨再生;负载有各种生长因子的材料具有成骨作用,可以促进牙槽骨缺损的修复;干细胞组织工程的种子细胞具有成骨、成纤维的作用,可以分化为成骨细胞,生成新生骨质。近几年的研究热衷于对以上几种方法的结合使用,研发出新的具有良好生物相容性、可缓慢释放功能药物或材料,来促进牙槽骨缺损的再生修复。
文摘目的:探讨3D打印个性化钛网的引导骨再生(guided bone regeneration,GBR)术及富血小板纤维蛋白(platelet-rich fibrin,PRF)/Bio-Oss复合物修复牙槽骨缺损的应用。方法:纳入2021年3月至2024年2月于甘肃省中医院口腔颌面外科行GBR骨增量手术的牙槽骨缺损患者68例,随机分为3D组(n=34)与传统组(n=34),3D组使用3D打印个性化钛网及PRF/BioOss复合物,传统组使用传统钛网及PRF/Bio-Oss复合物。对比2组术后2、4、6个月的牙槽骨增加高度、宽度、体积及并发症发生率。结果:3D组术后2、4、6个月的牙槽骨增加高度、宽度与传统组相比,但差异均无统计学意义(P>0.05)。3D组术后2个月、4个月的牙槽骨增加体积均高于传统组,但差异均无统计学意义(P>0.05),术后6个月时牙槽骨增加体积显著高于传统组(P<0.05)。3D组发生早期暴露、晚期暴露、总暴露、创口感染的比例均低于传统组,但差异均无统计学意义(P>0.05)。结论:3D打印个性化钛网及PRF/Bio-Oss复合物的GBR术修复牙槽骨缺损效果良好,术后6个月骨增加体积显著高于应用传统钛网的GBR术,且不影响其安全性,值得临床推广应用。
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。
