目的: 探討植體修復體的PEEK材料在不同負載方向作用下，對植體及周圍骨組織的應力值及應力分佈的影響。材料與方法:運用有限元素分析軟件建立植體修復體及下顎骨模型，植體修復物分別為植體、螺絲、支台、薄殼冠、牙冠這五部分組成。下顎骨模型簡化為圓柱體設計，分為外層的皮質骨和內層的海綿骨。實驗中依不同的修復物材料分成四個實驗組，進行有限元素分析和實體試片抗壓測試，負載設定為100 N，施力方向以垂直方向和斜方向施加於牙冠咬合面上。結果: 在有限元素分析結果顯示使用PEEK作為牙冠的實驗組，在垂直方向負載作用下，最大應力發生在支台，應力值為PFM冠與全陶瓷牙冠實驗組的2.5倍大，而在斜向負載作用下，最大應力也發生在支台，但應力值比較小。以PEEK作為牙冠及支台的實驗組，受斜向負載作用下，在支台產生的應力值比其他三個實驗組都小，但在其他部位的應力值都比其他組大。實體抗壓測試結果顯示，不管力的方向如何，PEEK牙冠的實驗組之最大抗壓力與PFM冠和全陶瓷牙冠的實驗組相似。結論: 本研究經有限元素分析與實體抗壓測試結果證實，以PEEK作為牙冠的植體修復物在受到垂直與斜方向力的作用下，可耐受與PFM冠和全陶瓷牙冠相似的最大壓力，並且有限元素分析說明PEEK牙冠具有緩衝和減少在植體及周圍齒槽骨上的應力作用的效果。
The purpose of this study was to investigate effect of PEEK material for dental prosthesis-implant under a loading with different direction on the stress value and stress distribution in dental prosthesis-implant and bone around the dental implant. Using a finite element analysis software constructed implant-prosthesis and the jaw bone models. The dental prosthesis-implant is composed primarily of five parts: the implant, screw, abutment, coping, and the crown. Bone geometry was designed a simple cylindricalwith inner spongy bone and outer cortical bone. In this study four experimental groups were established by different restoration materials. The finite element analysis and actual compression test with force application of 100 N at an angle of 30 degrees to vertical or vertical on occlusal surface of crowns were executed to test the mechanical properties of the dental prosthesis-implant, respectively. In the finite element analysis results show that the maximum stress of group 3 created with PEEK crown prosthesis-implant occurred at the abutment, when the vertical direction load was applied. The stress is 2.5 times bigger than that of group created with PFM or all ceramic crown prosthesis-implant. When the oblique load applied, however the maximum stress of group 3 occurred at the same abutment unit, the stress value is smaller. When the oblique load applied, the group 4 made with PEEK material as crown and abutment generated smaller stress at the abutment part than that of the other groups. However, the stress values of other parts are larger than those of the other groups. Actual compression test results show that the stress resistance value of group 3 created with PEEK crown prosthesis-implant was similar than that of PFM or all ceramic crown group, whatever load directions. These results suggested that the implant prosthesis created with PEEK crown has similar able to resist maximum compression stress, whatever load directions. Finite element analysis in this study confirmed that the PEEK crown for implant prosthesis could decrease stress to impose on the dental prosthesis-implant and bone around dental implant.
