Polyetheretherketone/nano-fluorohydroxyapatite composite with antimicrobial activity and osseointegration properties

Lack of antibacterial activity and binding ability to natural bone tissue has significantly limited polyetheretherketone (PEEK) for many challenging dental implant applications. Here, we have developed a polyetheretherketone/nano-fluorohydroxyapatite (PEEK/nano-FHA) biocomposite with enhanced antibacterial activity and osseointegration through blending method. Smooth and rough surfaces of PEEK/nano-FHA biocomposites were also prepared. Our results showed that in vitro initial cell adhesion and proliferation on the nano-FHA reinforced PEEK composite were improved. In addition, higher alkaline phosphatase activity and cell mineralization were also detected in cells cultured on PEEK/nano-FHA biocomposites, especially for rough PEEK/nano-FHA surfaces. More importantly, the as-prepared PEEK/nano-FHA biocomposite could effectively prevent the proliferation and biofilm formation of bacterial. For in vivo test, the newly formed bone volume of PEEK/nano-FHA group was higher than that of bare PEEK group based on 3D microcomputed tomography and 2D histomorphometric analysis. These reports demonstrate that the developed PEEK/nano-FHA biocomposite has increased biocompatibility and antibacterial activity in vitro, and promoted osseointegration in vivo, which suggests that it holds potential to be applied as dental implant material in dental tissue engineering applications.     

n-HA/PA66与PEEK cage在颈前路椎间盘切除减压术后椎间隙重建的比较研究

目的　观察比较纳米羟基磷灰石/聚酰胺66颈椎融合器（n-HA/PA66 Cage）与聚醚醚酮颈椎融合器(PEEK Cage)在颈前椎间盘切除减压术后椎间隙植骨重建的初期疗效。 方法　回顾性分析2008年6月~2011年6月手术治疗资料完整的57例颈椎病患者,行颈前路椎间盘切除减压Cage植骨融合钛钉板系统内固定治疗,其中31例采用n-HA/PA66 cage, 26例采用PEEK cage 。术后随访包括影像学及临床疗效评价,影像学评价包括术前、术后正侧位片、动力位片观察植骨融合率、塌陷率、颈椎曲度及手术节段椎间隙高度情况;临床疗效采用Odom标准评定。 结果　n-HA/PA66组患者6月时获得97.7%植骨融合,PEEK组融合率100%,两组融合率无统计学差异（P＞0.05）;n-HA/PA66组术后颈椎丢失的角度为(2.06±1.77)°较PEEK组(2.39±1.56)°稍低,两组数据无统计学差异（P=0.384）;n-HA/PA66组与　PEEK组术后平均椎间隙丢失高度无统计学意义（0.46±0.52 mm,0.41±0.18 mm,P=0.599）,其中n-HA/PA66组出现1例患者1个节段塌陷,塌陷率2.3%,与PEEK组塌陷率（0%）比较无统计学差异（P=0.372）;PEEK组获得81%临床优良率对比n-HA/PA66组77%的优良率无统计学差异（P=0.757）。 结论　颈前路椎间盘切除减压后,n-HA/PA66与PEEK cage椎间隙植骨融合并内固定治疗颈椎病的初期临床疗效与影像学结果均较好且相似。     

聚醚醚酮基骨科植入物的改性技术研究

目的 结合聚醚醚酮（PEEK）、聚乳酸（PLA）和硫酸软骨素锶（SrCS）各自的优势,制备出易加工、与松质骨力学性能匹配且兼具生物活性的聚醚醚酮基生物材料。方法 将熔融的PLA充分地填充在PEEK二维编织结构孔隙中,通过热压制备PLA/PEEK复合材料,并对其表面形貌和结构、结晶度、宏观和微观力学强度进行研究。随后在最优力学性能的PLA/PEEK复合材料中引入SrCS并使其与细胞共培养,通过MTT法评价细胞在复合材料上的增殖情况。结果 在155℃和10 MPa的热压条件下,PLA与PEEK细丝结合致密并形成了互锁结构,所得PLA/PEEK复合材料具有与松质骨相似的抗断裂性能、弹性模量和多尺度力学特性。SrCS的引入对复合材料的力学特性进行了微调,并显著提升其生物活性。结论 PLA和SrCS的引入可以有效地改善PEEK基材料的可加工性和生物活性,且结构互锁的PLA/PEEK复合材料具有仿松质骨的力学特性,因此SrCS/PLA/PEEK复合材料有潜力作为新型的骨科修复材料。     

聚芳醚酮的口腔临床应用及其产品化研究进展

聚芳醚酮(PAEK)家族及其复合材料良好的化学稳定性、生物学性能和接近天然牙以及密质骨的机械性能,使其在口腔修复、种植、正畸及颌面外科等临床领域得到了广泛的应用.随着对该类材料的不断研究,已有部分产品可直接应用于临床治疗.本文就PAEK家族材料在口腔领域的临床应用及产品化作一综述.     

载药脂质体修饰的聚醚醚酮植入物的抑菌和骨整合性能

目的: 制备地塞米松/米诺环素(dexamethasone/minocycline,Dex/Mino)脂质体(liposome,lipo)修饰的聚醚醚酮(polyetheretherketone,PEEK),探究功能化PEEK在体内应用时是否能有效预防感染且促进新骨再生,实现生理骨整合。方法: 利用聚多巴胺(polydopamine,pDA)涂层作中间介质,将Dex/Mino脂质体修饰到PEEK表面,通过荧光脂质体接枝进行定性和定量检测,评价脂质体是否成功共价修饰在该表面。分别建立小鼠皮下植入感染模型和比格犬股骨植入模型,通过Micro-CT及苏木精-伊红(hematoxylin-eosin,HE)染色分析,评价Dex/Mino脂质体修饰的PEEK的体内生物活性。结果: 荧光脂质体接枝定性和定量结果显示,pDA功能化修饰组的红色荧光强度强于非功能化修饰组(P<0.05),由于pDA涂层的存在,脂质体成功接枝于PEEK表面并在其表面均匀分布。小鼠皮下PEEK片植入24 h后,HE染色结果显示,与纯PEEK组相比,PEEK-Dex/Mino lipo组的炎性细胞数量较低(P<0.05),即感染程度较低,提示脂质体中Mino的释放在体内能有效地预防感染。比格犬股骨植入8周后,Micro-CT和HE染色结果显示,在PEEK-Dex/Mino lipo组中,新骨形成比纯PEEK组多,且牢固地结合在功能化修饰的PEEK表面,沿着PEEK界面延伸,提示脂质体中Dex的释放在体内有效地刺激和引导了新骨再生。结论: Dex/Mino脂质体修饰提高了惰性PEEK的生物活性,功能化PEEK具有增强的骨整合能力(预防感染和促进新骨再生),其作为牙科/骨科替代修复材料极具临床应用前景。