Schwitalla A D, Abou-Emara M, Spintig T, Lackmann J, Müller W D
Department of Dental Materials and Biomaterial Research, School of Dentistry, Charité-University Medicine, Berlin, Germany.
Beuth University of Applied Sciences, Berlin, Germany.
J Biomech. 2015 Jan 2;48(1):1-7. doi: 10.1016/j.jbiomech.2014.11.017. Epub 2014 Nov 20.
Dental implants are mostly fabricated of titanium. Potential problems associated with these implants are discussed in the literature, for example, overloading of the jawbone during mastication due to the significant difference in the elastic moduli of titanium (110 GPa) and bone (≈1-30 GPa). Therefore poly-ether-ether-ketone (PEEK) could represent an alternative biomaterial (elastic modulus 3-4 GPa). Endolign(®) represents an implantable carbon fiber reinforced (CFR)-PEEK including parallel oriented endless carbon fibers. According to the manufacturer it has an elastic modulus of 150 GPa. PEEK compounds filled with powders show an elastic modulus around 4 GPa. The aim of the present finite element analysis was to point out the differences in the biomechanical behavior of a dental implant of Endolign(®) and a commercial powder-filled PEEK. Titanium served as control. These three materials were used for a platform-switched dental implant-abutment assembly, whereas Type 1 completely consisted of titanium, Type 2 of a powder-filled PEEK and Type 3 of Endolign(®). A force of 100 N was applied vertically and of 30° to the implant axis. All types showed a minimum safety factor regarding the yield strength of cortical bone. However, within the limits of this study the Type 2 implant showed higher stresses within the adjacent cortical bone than Type 1 and Type 3. These implant assemblies showed similar stress distributions. Endless carbon fibers give PEEK a high stability. Further investigations are necessary to evaluate whether there is a distinct amount of endless carbon fibers causing an optimal stress distribution behavior of CFR-PEEK.
牙科植入物大多由钛制成。文献中讨论了与这些植入物相关的潜在问题，例如，由于钛（110吉帕）和骨（约1 - 30吉帕）的弹性模量存在显著差异，咀嚼过程中颌骨会承受过载。因此，聚醚醚酮（PEEK）可能是一种替代生物材料（弹性模量为3 - 4吉帕）。Endolign（®）是一种可植入的碳纤维增强（CFR）-PEEK，其中包含平行排列的连续碳纤维。根据制造商的说法，它的弹性模量为150吉帕。填充有粉末的PEEK复合材料的弹性模量约为4吉帕。本有限元分析的目的是指出Endolign（®）牙科植入物和商用粉末填充PEEK在生物力学行为上的差异。钛用作对照。这三种材料用于平台转换的牙种植体 - 基台组件，其中1型完全由钛组成，2型由粉末填充的PEEK组成，3型由Endolign（®）组成。垂直于种植体轴线并以30°角施加100牛的力。所有类型在皮质骨屈服强度方面均显示出最小安全系数。然而，在本研究的范围内，2型植入物在相邻皮质骨内的应力高于1型和3型。这些植入物组件显示出相似的应力分布。连续碳纤维赋予PEEK高稳定性。需要进一步研究以评估是否存在特定数量的连续碳纤维可导致CFR-PEEK具有最佳应力分布行为。
