聚醚醚酮/碳纳米管/生物活性玻璃复合材料的成骨细胞相容性研究

目的:探讨新型聚醚醚酮/碳纳米管/生物活性玻璃(PEEK/CNTs/BGs)复合材料的体外成骨细胞相容性。方法:体外培养小鼠成骨细胞MC3T3-E1,通过噻唑蓝法、吖啶橙荧光染色法研究PEEK/CNTs/BGs复合材料对成骨细胞增殖的影响。应用扫描电镜(SEM)观察MC3T3-E1细胞在PEEK/CNTs/BGs复合材料表面的黏附生长情况。结果:MC3T3-E1细胞在PEEK/CNTs/BGs复合材料表面的增殖能力较聚醚醚酮和聚醚醚酮/碳纳米管(PEEK/CNTs)复合材料强。SEM实验结果表明,PEEK/CNTs/BGs复合材料表面有利于MC3T3-E1细胞黏附、铺展和生长。结论:PEEK/CNTs/BGs复合材料具有良好的成骨细胞相容性,有望作为新型骨科材料。     

Effect of laser groove treatment on shear bond strength of resin-based luting agent to polyetheretherketone (PEEK)

Purpose

The mechanical properties of polyetheretherketone (PEEK) are ideally suited for fixed dental prostheses. However, PEEK typically has low adhesion strength to resin-based luting agent. This study assessed the shear bond strength between laser groove treated PEEK and resin-based luting agent.

Dolor facial atípico asociado a craneoplastia: ¿un encaje demasiado perfecto?

Cranioplasty is a procedure routinely performed in neurosurgery. It is associated with significant morbidity and several types of postsurgical complications. The most common are infections, bone flap resorption and hematomas. Atypical facial pain has not been documented yet as a potential postoperative complication. We present a case of atypical facial pain reported at immediate postoperative period after cranioplasty. The pain was refractory to medical treatment and sphenopalatine ganglion block. Eventually, the pain totally disappeared after surgical revision of the cranial implant.     

3D打印材料聚醚醚酮支架在耳廓再造中的应用前景

3D打印材料聚醚醚酮(PEEK)是一种在医学领域有许多潜在用途的聚合物,随着3D打印技术的逐渐兴起,不仅能针对患者的病情需求打印出个性化植入,而且PEEK具备作为植入物的必备性能,这两大优点表明其在耳廓的修复与重建领域中有望替代传统修复材料.该文对3D打印材料PEEK作为植入物所具备的优良性能,以及在耳廓再造领域的应用...     

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。     

The effects of three cold plasma treatments on the osteogenic activity and antibacterial property of PEEK

ObjectiveThis study examines the differences in osteogenic activity and antibacterial property among polyetheretherketone (PEEK) treated by three types of cold plasma.MethodsStandard PEEK specimens were randomly assigned to four groups, which were named according to the treatment: PEEK-C (untreated), PEEK-A (Ar cold plasma treatment), PEEK-N (N₂ cold plasma treatment), and PEEK-AN (90% Ar and 10% N₂ mixed cold plasma treatment). Physical and chemical properties of the specimen surfaces were determined by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and drop shape analyzer (DSA). MC3T3 osteoblasts were used in vitro to determine the osteogenic activity by cell adhesion morphology observation, cell counting-kit 8 (CCK-8) assay, and alkaline phosphatase (ALP) activity assay. Streptococcus mutans and Staphylococcus aureus were used in vitro to determine the antibacterial property by a plate colony-counting method and bacterial adhesion morphology observation.ResultsSEM and AFM analysis showed that the PEEK-C surface was smooth, whereas matrix-arranged nanoprotrusions appeared on the surface of the experimental groups: scaly nano-protrusions appeared on the PEEK-A and PEEK-AN surfaces, while dendritic nanoprotrusions appeared on the PEEK-N surface. Among the experimental groups, PEEK-AN had the finest surface nanoprotrusions. The roughness of the experimental groups increased compared with the PEEK-C group: the PEEK-N group was the roughest with a Ra of 192.60 ± 5.89 nm and PEEK-A was the smoothest with a Ra of 99.60 ± 5.43 nm. The hydrophilicity of the experimental groups was significantly enhanced compared with the PEEK-C group, among which, PEEK-N was the strongest and PEEK-A the weakest. The osteogenic activity and antibacterial property of the experimental groups displayed a remarkable increase compared with the PEEK-C group. Among the experimental groups, PEEK-N displayed the best osteogenic activity while PEEK-AN possessed the strongest antibacterial property. The osteogenic activity and antibacterial performance of PEEK-A were the weakest. Among these treatments, the N₂ cold plasma treatment was the most suitable modification method for PEEK application in dental implant.SignificanceCold plasma treatment is a promising method to improve PEEK osteogenic activity and antibacterial properties. This study provides a theoretical basis for future research on PEEK cold plasma treatment.     

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。     

医用聚醚醚酮材料骨整合改性的研究进展

聚醚醚酮（PEEK）材料具有良好的生物相容性、优异的机械性能、与骨组织相似的力学性能等优点,目前已广泛应用于临床各个领域。由于固有的生物惰性,使种植体与骨组织不相整合,从而限制了其作为骨科植入材料的应用。提高PEEK骨整合性成为目前研究的热点。研究者将具有促进成骨细胞增殖和分化的材料（如生物陶瓷、金属材料、生物因子等）通过物理或化学方式修饰于材料表面,或者采用表面物理修饰（如粗糙度、孔隙率、纳米结构等）提高其骨整合性。随着研究的逐步深入,PEEK的成骨活性得到增强,在临床上有了更大的应用前景。本文主要对上述提到的近些年用于提高PEEK生物活性的方法作一综述,旨在为研究者提供参考,并对未来发展提出展望。