Schwitalla Andreas Dominik, Abou-Emara Mohamed, Zimmermann Tycho, Spintig Tobias, Beuer Florian, Lackmann Justus, Müller Wolf-Dieter
Dental Materials and Biomaterial Research, Department of Prosthodontics, School of Dentistry Charité-University Medicine Berlin, Aßmannshauser Str. 4-6, 14197 Berlin, Germany.
Beuth University of Applied Sciences, Luxemburger Str. 10, 13353 Berlin, Germany.
J Mech Behav Biomed Mater. 2016 Oct;63:244-251. doi: 10.1016/j.jmbbm.2016.06.024. Epub 2016 Jul 1.
The high-performance polymer PEEK (poly-ether-ether-ketone) is more and more being used in the field of dentistry, mainly for removable and fixed prostheses. In cases of screw-retained implant-supported reconstructions of PEEK, an abutment screw made of PEEK might be advantageous over a conventional metal screw due to its similar elasticity. Also in case of abutment screw fracture, a screw of PEEK could be removed more easily. M1.6-abutment screws of four different PEEK compounds were subjected to tensile tests to set their maximum tensile strengths in relation to an equivalent stress of 186MPa, which is aused by a tightening torque of 15Ncm. Two screw types were manufactured via injection molding and contained 15% short carbon fibers (sCF-15) and 40% (sCF-40), respectively. Two screw types were manufactured via milling and contained 20% TiO2 powder (TiO2-20) and >50% parallel orientated, continuous carbon fibers (cCF-50). A conventional abutments screw of Ti6Al4V (Ti; CAMLOG(®) abutment screw, CAMLOG, Wimsheim, Germany) served as control. The maximum tensile strength was 76.08±5.50MPa for TiO2-20, 152.67±15.83MPa for sCF-15, 157.29±20.11MPa for sCF-40 and 191.69±36.33MPa for cCF-50. The maximum tensile strength of the Ti-screws amounted 1196.29±21.4MPa. The results of the TiO2-20 and the Ti screws were significantly different from the results of the other samples, respectively. For the manufacturing of PEEK abutment screws, PEEK reinforced by >50% continuous carbon fibers would be the material of choice.
高性能聚合物聚醚醚酮（PEEK）在牙科领域的应用越来越广泛，主要用于活动和固定修复体。在采用PEEK进行螺丝固位的种植体支持修复中，由于其弹性相似，PEEK基台螺丝可能比传统金属螺丝更具优势。此外，在基台螺丝断裂的情况下，PEEK螺丝更容易取出。对四种不同PEEK化合物的M1.6基台螺丝进行拉伸试验，以确定其相对于186MPa等效应力的最大拉伸强度，该等效应力由15Ncm的拧紧扭矩产生。两种螺丝类型通过注塑成型制造，分别含有15%的短碳纤维（sCF-15）和40%的短碳纤维（sCF-40）。另外两种螺丝类型通过铣削制造，分别含有20%的TiO2粉末（TiO2-20）和>50%的平行取向连续碳纤维（cCF-50）。以Ti6Al4V传统基台螺丝（Ti；CAMLOG(®)基台螺丝，德国温斯海姆的CAMLOG公司）作为对照。TiO2-20的最大拉伸强度为76.08±5.50MPa，sCF-15为152.67±15.83MPa，sCF-40为157.29±20.11MPa，cCF-50为191.69±36.33MPa。Ti螺丝的最大拉伸强度为1196.29±21.4MPa。TiO2-20和Ti螺丝的结果分别与其他样品的结果有显著差异。对于制造PEEK基台螺丝，用>50%连续碳纤维增强的PEEK将是首选材料。
