Long-term nonunion of bone defects has always been a major problem in orthopedic treatment.Artificial bone graft materials such as Poly(lactic-co-glycolic acid)/β-tricalcium phosphate(PLGA/β-TCP)scaffolds are expect...Long-term nonunion of bone defects has always been a major problem in orthopedic treatment.Artificial bone graft materials such as Poly(lactic-co-glycolic acid)/β-tricalcium phosphate(PLGA/β-TCP)scaffolds are expected to solve this problem due to their suitable degradation rate and good osteoconductivity.However,insufficient mechanical properties,lack of osteoinductivity and infections after implanted limit its large-scale clinical application.Hence,we proposed a novel bone repair bioscaffold by adding zinc submicron particles to PLGA/β-TCP using low temperature rapid prototyping 3D printing technology.We first screened the scaffolds with 1 wt%Zn that had good biocompatibility and could stably release a safe dose of zinc ions within 16 weeks to ensure long-term non-toxicity.As designed,the scaffold had a multi-level porous structure of biomimetic cancellous bone,and the Young’s modulus(63.41±1.89 MPa)and compressive strength(2.887±0.025 MPa)of the scaffold were close to those of cancellous bone.In addition,after a series of in vitro and in vivo experiments,the scaffolds proved to have no adverse effects on the viability of BMSCs and promoted their adhesion and osteogenic differentiation,as well as exhibiting higher osteogenic and anti-inflammatory properties than PLGA/β-TCP scaffold without zinc particles.We also found that this osteogenic and anti-inflammatory effect might be related to Wnt/β-catenin,P38 MAPK and NFkB pathways.This study lay a foundation for the follow-up study of bone regeneration mechanism of Zn-containing biomaterials.We envision that this scaffold may become a new strategy for clinical treatment of bone defects.展开更多
This paper reports the results of 24 cases of bone defect resulting from bone tumor or tumor condition excision, and of posterior spinal fusion, treated by human bone matrix gelatin. The success rate of bone defect re...This paper reports the results of 24 cases of bone defect resulting from bone tumor or tumor condition excision, and of posterior spinal fusion, treated by human bone matrix gelatin. The success rate of bone defect repair and spinal fusion is 91. 67 %. The results suggest that human bone matrix gelatin has. excellent osteoinductive effect and is ideal substitute for bone autografts.展开更多
We investigated the osteogenic characteristic and biodegradation behavior of porous beta-tricalcitum phosphate ( β- TCP ) and bone morphogenetic protein/beta-tricalcium phosphate ( BMP/ β- TCP ) complex in mand...We investigated the osteogenic characteristic and biodegradation behavior of porous beta-tricalcitum phosphate ( β- TCP ) and bone morphogenetic protein/beta-tricalcium phosphate ( BMP/ β- TCP ) complex in mandibular reconstruction and evaluated the advantages of BMP / β- TCP complex in repairing bone defects. Bone defects created in the lower margin of bilateral mandible bodies in 12 rabbits were repaired with β- TCP ( control group ) and BMP/ β- TCP complex ( experimental group ) respectively. The rabbits were euthanized after 2, 4, 8 and 12 weeks and examined by macroscopy, radiography, histology, histomorphometry and image analysis. 2 weeks after surgery, ossftcation of newly-generated tissue in BMP/ β- TCP complex group appeared and after 12 weeks, massive new bone and ossification maturation were seen. However, in β- TCP group without BMP , ossification was not found until 12 weeks after operation. Image analysis showed that bone regeneration rate of BMP/ β- TCP was 30%-40% higher and the degradation rate was 20%- 30% higher than that of β- TCP. Therefore, as a reconstructive material for bone defects, BMP/ β-TCP complex is superior to β-TCP and can be used in oral and maxillofacial surgery.展开更多
So far,how to achieve the optimal regenerative repair of large load-bearing bone defects using artificial bone grafts is a huge challenge in clinic.In this study,a strategy of combining osteoinductive biphasic calcium...So far,how to achieve the optimal regenerative repair of large load-bearing bone defects using artificial bone grafts is a huge challenge in clinic.In this study,a strategy of combining osteoinductive biphasic calcium phosphate(BCP)bioceramic scaffolds with intramedullary nail fixation for creating stable osteogenic microenvironment was applied to repair large segmental bone defects(3.0 cm in length)in goat femur model.The material characterization results showed that the BCP scaffold had the initial compressive strength of over 2.0 MPa,and total porosity of 84%.The cell culture experiments demonstrated that the scaffold had the excellent ability to promote the proliferation and osteogenic differentiation of rat bone marrow-derived mesenchymal stem cells(BMSCs).The in vivo results showed that the intramedullary nail fixation maintained the initial stability and structural integrity of the implants at early stage,promoting the osteogenic process both guided and induced by the BCP scaffolds.At 9 months postoperatively,good integration between the implants and host bone was observed,and a large amount of newborn bones formed,accompanying with the degradation of the material.At 18 months postoperatively,almost the complete new bone substitution in the defect area was achieved.The maximum bending strength of the repaired bone defects reached to the 100% of normal femur at 18 months post-surgery.Our results demonstrated the good potential of osteoinductive BCP bioceramics in the regenerative repair of large load-bearing bone defects.The current study could provide an effective method to treat the clinical large segmental bone defects.展开更多
目的:观察富血小板血浆(platelet-rich plasma,PRP)、PRP复合骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损的修复效果,探讨其作为种植体周围骨缺损修复材料的可行性。方法:Beagle犬4只,拔除双侧下颌第一、二...目的:观察富血小板血浆(platelet-rich plasma,PRP)、PRP复合骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损的修复效果,探讨其作为种植体周围骨缺损修复材料的可行性。方法:Beagle犬4只,拔除双侧下颌第一、二、四前磨牙,3个月后植入种植体,制备种植体周围骨缺损并植入相应骨移植材料。A组植入PRP/OAM,B组植入PRP/磷酸三钙,对照组植入磷酸三钙。种植术后8、16周各处死2只动物,进行组织学观察,能谱分析种植体-新骨界面Ca2+含量,采用SPSS13.0软件包对数据进行单因素方差分析。结果:8周时,实验A组新骨与种植体形成区段性骨结合;实验B组种植体边缘可见新骨形成,但量较少;对照组种植体边缘为纤维性界面。16周时,实验A组可见哈佛系统,实验A、B组新骨与种植体形成骨整合;对照组为纤维性结合。能谱分析显示,8、16周时各组间钙含量百分比均存在显著差异。实验A组最高,实验B组其次,对照组最低。结论:PRP及PRP/OAM应用于种植体周围骨缺损中,可以促进骨缺损的修复,并形成理想的种植体-骨结合界面。展开更多
目的:通过动物实验,探讨骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损的修复能力,为临床应用提供实验依据。方法:Beagle犬4只,拔除双侧下颌第一、二前磨牙,将每只犬的两侧实验牙位随机分为实验侧和对照侧。...目的:通过动物实验,探讨骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损的修复能力,为临床应用提供实验依据。方法:Beagle犬4只,拔除双侧下颌第一、二前磨牙,将每只犬的两侧实验牙位随机分为实验侧和对照侧。拔牙后3个月植入种植体,建立种植体周围骨缺损模型。实验组种植体周围骨缺损区植入OAM,对照组植入磷酸三钙。于植入后第8、16周分别处死2只动物,进行组织学、扫描电镜观察,测量骨密度,能谱分析种植体—新骨界面Ca2+含量,采用SPSS13.0软件包对数据进行t检验。结果:8周时,实验组新骨与种植体形成区段性骨结合,对照组种植体边缘为纤维性界面。实验组与对照组骨密度差异无统计学意义(P>0.05),实验组种植体—新骨界面Ca2+含量(22.16±3.33)显著高于对照组(3.13±2.44)(P<0.05)。16周时,实验组新生骨与种植体形成骨整合,对照组为纤维性结合。实验组骨密度显著高于对照组(P<0.05),实验组种植体—新骨界面Ca2+含量(42.23±6.20)显著高于对照组(10.40±3.12)(P<0.05)。结论:OAM能促进种植体周围骨缺损修复,并促进种植体—骨界面形成较完善的骨整合。展开更多
目的从组织学角度评价骨诱导活性材料(osteoinduction active material,OAM)复合富血小板血浆(platelet-rich plas-ma,PRP)对种植体周围骨缺损的修复效果。方法Beagle犬4只,拔除下颌1、2、4前磨牙。每只犬左右两侧实验牙位随机分为实验...目的从组织学角度评价骨诱导活性材料(osteoinduction active material,OAM)复合富血小板血浆(platelet-rich plas-ma,PRP)对种植体周围骨缺损的修复效果。方法Beagle犬4只,拔除下颌1、2、4前磨牙。每只犬左右两侧实验牙位随机分为实验侧和对照侧,实验侧第4前磨牙牙位为实验A组,第1、2前磨牙牙位为实验B组,对照侧第1、2前磨牙牙位为对照组。3个月后植入种植体,制备种植体周围骨缺损。实验A组骨缺损区植入OAM/PRP;B组植入OAM;对照组植入磷酸三钙。8、16周分别处死动物2只,进行组织学观察,能谱分析种植体-新骨界面Ca含量。结果8周时,A、B组新骨与种植体形成区段性骨结合,对照组种植体边缘为纤维性界面。各组间种植体-新骨界面Ca含量存在显著性差异。16周时,实验A、B组可见哈佛氏系统,新骨与种植体形成骨整合,对照组为纤维性结合。实验各组Ca含量均显著高于对照组。结论OAM及PRP/OAM能促进种植体周围骨缺损修复。展开更多
目的:探讨富血小板血浆(platelet-richplasma,PRP)、PRP复合骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损修复的作用。方法:Beagle犬4只,拔除每只犬一侧下颌第一、二前磨牙及其双侧下颌第四前磨牙作为实验牙...目的:探讨富血小板血浆(platelet-richplasma,PRP)、PRP复合骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损修复的作用。方法:Beagle犬4只,拔除每只犬一侧下颌第一、二前磨牙及其双侧下颌第四前磨牙作为实验牙位。3个月后拔牙处植入种植体,每只犬共植入3颗种植体,第一、二前磨牙牙位植入1颗种植体为对照组,对侧第四前磨牙牙位植入1颗种植体为实验A组,同侧第四前磨牙牙位植入1颗种植体为实验B组。种植术中同期制备种植体周围骨缺损并植入相应骨移植材料:A组植入PRP/OAM;B组植入PRP/磷酸三钙;对照组植入磷酸三钙。种植术后8、16周处死动物,进行组织学观察,测量种植体周围骨密度,采用SPSS13.0软件对数据进行单因素方差分析。结果:8周时,实验A组新骨与种植体形成区段性骨结合;实验B组种植体边缘可见新骨形成,但量较少;对照组种植体边缘为纤维性界面。8周时骨密度测量,各组间骨密度差异无统计学意义。16周时,实验A组可见哈佛系统,实验A、B组新骨与种植体形成骨整合;对照组仅为纤维性结合。16周时骨密度测量,两实验组骨密度均显著高于对照组。结论:PRP及PRP/OAM可促进种植体周围骨缺损修复。展开更多
基金supported by Tsinghua University-Peking Union Medical College Hospital Initiative Scientific Research Program(20191080871)the National Natural Science Foundation of China(82272464,82002314).
文摘Long-term nonunion of bone defects has always been a major problem in orthopedic treatment.Artificial bone graft materials such as Poly(lactic-co-glycolic acid)/β-tricalcium phosphate(PLGA/β-TCP)scaffolds are expected to solve this problem due to their suitable degradation rate and good osteoconductivity.However,insufficient mechanical properties,lack of osteoinductivity and infections after implanted limit its large-scale clinical application.Hence,we proposed a novel bone repair bioscaffold by adding zinc submicron particles to PLGA/β-TCP using low temperature rapid prototyping 3D printing technology.We first screened the scaffolds with 1 wt%Zn that had good biocompatibility and could stably release a safe dose of zinc ions within 16 weeks to ensure long-term non-toxicity.As designed,the scaffold had a multi-level porous structure of biomimetic cancellous bone,and the Young’s modulus(63.41±1.89 MPa)and compressive strength(2.887±0.025 MPa)of the scaffold were close to those of cancellous bone.In addition,after a series of in vitro and in vivo experiments,the scaffolds proved to have no adverse effects on the viability of BMSCs and promoted their adhesion and osteogenic differentiation,as well as exhibiting higher osteogenic and anti-inflammatory properties than PLGA/β-TCP scaffold without zinc particles.We also found that this osteogenic and anti-inflammatory effect might be related to Wnt/β-catenin,P38 MAPK and NFkB pathways.This study lay a foundation for the follow-up study of bone regeneration mechanism of Zn-containing biomaterials.We envision that this scaffold may become a new strategy for clinical treatment of bone defects.
文摘This paper reports the results of 24 cases of bone defect resulting from bone tumor or tumor condition excision, and of posterior spinal fusion, treated by human bone matrix gelatin. The success rate of bone defect repair and spinal fusion is 91. 67 %. The results suggest that human bone matrix gelatin has. excellent osteoinductive effect and is ideal substitute for bone autografts.
文摘We investigated the osteogenic characteristic and biodegradation behavior of porous beta-tricalcitum phosphate ( β- TCP ) and bone morphogenetic protein/beta-tricalcium phosphate ( BMP/ β- TCP ) complex in mandibular reconstruction and evaluated the advantages of BMP / β- TCP complex in repairing bone defects. Bone defects created in the lower margin of bilateral mandible bodies in 12 rabbits were repaired with β- TCP ( control group ) and BMP/ β- TCP complex ( experimental group ) respectively. The rabbits were euthanized after 2, 4, 8 and 12 weeks and examined by macroscopy, radiography, histology, histomorphometry and image analysis. 2 weeks after surgery, ossftcation of newly-generated tissue in BMP/ β- TCP complex group appeared and after 12 weeks, massive new bone and ossification maturation were seen. However, in β- TCP group without BMP , ossification was not found until 12 weeks after operation. Image analysis showed that bone regeneration rate of BMP/ β- TCP was 30%-40% higher and the degradation rate was 20%- 30% higher than that of β- TCP. Therefore, as a reconstructive material for bone defects, BMP/ β-TCP complex is superior to β-TCP and can be used in oral and maxillofacial surgery.
基金supported by the National Key R&D Program of China(2016YFC1102000)Research on repair technology and equipment of war injury(AWS17J004-02)the Science and Technology Innovation Seedling Project of Sichuan Province,China(2021057).
文摘So far,how to achieve the optimal regenerative repair of large load-bearing bone defects using artificial bone grafts is a huge challenge in clinic.In this study,a strategy of combining osteoinductive biphasic calcium phosphate(BCP)bioceramic scaffolds with intramedullary nail fixation for creating stable osteogenic microenvironment was applied to repair large segmental bone defects(3.0 cm in length)in goat femur model.The material characterization results showed that the BCP scaffold had the initial compressive strength of over 2.0 MPa,and total porosity of 84%.The cell culture experiments demonstrated that the scaffold had the excellent ability to promote the proliferation and osteogenic differentiation of rat bone marrow-derived mesenchymal stem cells(BMSCs).The in vivo results showed that the intramedullary nail fixation maintained the initial stability and structural integrity of the implants at early stage,promoting the osteogenic process both guided and induced by the BCP scaffolds.At 9 months postoperatively,good integration between the implants and host bone was observed,and a large amount of newborn bones formed,accompanying with the degradation of the material.At 18 months postoperatively,almost the complete new bone substitution in the defect area was achieved.The maximum bending strength of the repaired bone defects reached to the 100% of normal femur at 18 months post-surgery.Our results demonstrated the good potential of osteoinductive BCP bioceramics in the regenerative repair of large load-bearing bone defects.The current study could provide an effective method to treat the clinical large segmental bone defects.
文摘目的:观察富血小板血浆(platelet-rich plasma,PRP)、PRP复合骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损的修复效果,探讨其作为种植体周围骨缺损修复材料的可行性。方法:Beagle犬4只,拔除双侧下颌第一、二、四前磨牙,3个月后植入种植体,制备种植体周围骨缺损并植入相应骨移植材料。A组植入PRP/OAM,B组植入PRP/磷酸三钙,对照组植入磷酸三钙。种植术后8、16周各处死2只动物,进行组织学观察,能谱分析种植体-新骨界面Ca2+含量,采用SPSS13.0软件包对数据进行单因素方差分析。结果:8周时,实验A组新骨与种植体形成区段性骨结合;实验B组种植体边缘可见新骨形成,但量较少;对照组种植体边缘为纤维性界面。16周时,实验A组可见哈佛系统,实验A、B组新骨与种植体形成骨整合;对照组为纤维性结合。能谱分析显示,8、16周时各组间钙含量百分比均存在显著差异。实验A组最高,实验B组其次,对照组最低。结论:PRP及PRP/OAM应用于种植体周围骨缺损中,可以促进骨缺损的修复,并形成理想的种植体-骨结合界面。
文摘目的:通过动物实验,探讨骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损的修复能力,为临床应用提供实验依据。方法:Beagle犬4只,拔除双侧下颌第一、二前磨牙,将每只犬的两侧实验牙位随机分为实验侧和对照侧。拔牙后3个月植入种植体,建立种植体周围骨缺损模型。实验组种植体周围骨缺损区植入OAM,对照组植入磷酸三钙。于植入后第8、16周分别处死2只动物,进行组织学、扫描电镜观察,测量骨密度,能谱分析种植体—新骨界面Ca2+含量,采用SPSS13.0软件包对数据进行t检验。结果:8周时,实验组新骨与种植体形成区段性骨结合,对照组种植体边缘为纤维性界面。实验组与对照组骨密度差异无统计学意义(P>0.05),实验组种植体—新骨界面Ca2+含量(22.16±3.33)显著高于对照组(3.13±2.44)(P<0.05)。16周时,实验组新生骨与种植体形成骨整合,对照组为纤维性结合。实验组骨密度显著高于对照组(P<0.05),实验组种植体—新骨界面Ca2+含量(42.23±6.20)显著高于对照组(10.40±3.12)(P<0.05)。结论:OAM能促进种植体周围骨缺损修复,并促进种植体—骨界面形成较完善的骨整合。
文摘目的从组织学角度评价骨诱导活性材料(osteoinduction active material,OAM)复合富血小板血浆(platelet-rich plas-ma,PRP)对种植体周围骨缺损的修复效果。方法Beagle犬4只,拔除下颌1、2、4前磨牙。每只犬左右两侧实验牙位随机分为实验侧和对照侧,实验侧第4前磨牙牙位为实验A组,第1、2前磨牙牙位为实验B组,对照侧第1、2前磨牙牙位为对照组。3个月后植入种植体,制备种植体周围骨缺损。实验A组骨缺损区植入OAM/PRP;B组植入OAM;对照组植入磷酸三钙。8、16周分别处死动物2只,进行组织学观察,能谱分析种植体-新骨界面Ca含量。结果8周时,A、B组新骨与种植体形成区段性骨结合,对照组种植体边缘为纤维性界面。各组间种植体-新骨界面Ca含量存在显著性差异。16周时,实验A、B组可见哈佛氏系统,新骨与种植体形成骨整合,对照组为纤维性结合。实验各组Ca含量均显著高于对照组。结论OAM及PRP/OAM能促进种植体周围骨缺损修复。
文摘目的:探讨富血小板血浆(platelet-richplasma,PRP)、PRP复合骨诱导活性材料(osteoinduction active material,OAM)对种植体周围骨缺损修复的作用。方法:Beagle犬4只,拔除每只犬一侧下颌第一、二前磨牙及其双侧下颌第四前磨牙作为实验牙位。3个月后拔牙处植入种植体,每只犬共植入3颗种植体,第一、二前磨牙牙位植入1颗种植体为对照组,对侧第四前磨牙牙位植入1颗种植体为实验A组,同侧第四前磨牙牙位植入1颗种植体为实验B组。种植术中同期制备种植体周围骨缺损并植入相应骨移植材料:A组植入PRP/OAM;B组植入PRP/磷酸三钙;对照组植入磷酸三钙。种植术后8、16周处死动物,进行组织学观察,测量种植体周围骨密度,采用SPSS13.0软件对数据进行单因素方差分析。结果:8周时,实验A组新骨与种植体形成区段性骨结合;实验B组种植体边缘可见新骨形成,但量较少;对照组种植体边缘为纤维性界面。8周时骨密度测量,各组间骨密度差异无统计学意义。16周时,实验A组可见哈佛系统,实验A、B组新骨与种植体形成骨整合;对照组仅为纤维性结合。16周时骨密度测量,两实验组骨密度均显著高于对照组。结论:PRP及PRP/OAM可促进种植体周围骨缺损修复。