Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University, Goethestrasse 70, 80336, Munich, Germany.
Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University, Goethestrasse 70, 80336, Munich, Germany.
J Mech Behav Biomed Mater. 2022 May;129:105173. doi: 10.1016/j.jmbbm.2022.105173. Epub 2022 Mar 9.
To determine the fracture load before and after artificial aging of implant-supported 4-unit cantilever fixed dental prostheses (FDP) with frameworks made of two differently filled polyetheretherketone (PEEK) compounds and veneered using three different techniques.
A total of 120 duplicate 4-unit FDP frameworks were produced (n = 60 milled from PEEK, 20% TiO filled and n = 60 pressed from PEEK, 30% TiO filled) and veneered using three different techniques: (i) digital veneerings, (ii) conventional resin composite veneerings and (iii) prefabricated veneers (n = 20 per subgroup). The FDPs were adhesively bonded to titanium abutments and the fracture load was measured in a universal testing machine (1 mm/min) before and after artificial aging in a mastication simulator (1,200,000 cycles, 50 N, TC: 5/55 °C, 6000 cycles). The fracture patterns were analyzed using digital microscopy. Data were analyzed using the Kolmogorov-Smirnov test, two-way ANOVA, post hoc Scheffé, Chi-test (p < 0.05), and Weibull modulus m, as well as fracture patterns using the Ciba-Geigy table.
Veneering technique and filler content significantly affected the fracture load (p < 0.001). Prefabricated veneers showed higher fracture load (p ≤ 0.001) whereas digital and conventional veneerings were similar (p = 0.451). PEEK with 30% filler content presented higher fracture load (p < 0.001) compared with PEEK with 20%. Aging showed no effect on fracture load (p = 0.176). Regarding fracture types, no significant differences were found among the groups (p = 0.055).
Filler content of PEEK compound as well as veneering technique influenced fracture load while aging had no effect on fracture load. FDPs made of PEEK with 30% of filler content veneered using prefabricated veneers had the highest fracture resistance.
确定经过人工老化后，使用两种不同填充聚醚醚酮（PEEK）复合材料制成的框架以及通过三种不同技术贴面的种植体支持的 4 单位悬臂固定义齿（FDP）的断裂负荷。
共制作 120 个 4 单位 FDP 框架（n=60 个铣削的 PEEK，20%TiO2 填充，n=60 个压制的 PEEK，30%TiO2 填充），并通过三种不同技术贴面：（i）数字贴面，（ii）常规树脂复合贴面和（iii）预制贴面（每个亚组 20 个）。将 FDP 粘接到钛基台上，并在咀嚼模拟器中进行人工老化之前和之后（1,200,000 次循环，50N，TC：5/55°C，6000 次循环）在万能试验机上测量断裂负荷。使用数字显微镜分析断裂模式。使用 Kolmogorov-Smirnov 检验、双因素方差分析、事后 Scheffé 检验、卡方检验（p<0.05）和 Weibull 模量 m 以及 Ciba-Geigy 表中的断裂模式分析数据。
贴面技术和填充材料显著影响断裂负荷（p<0.001）。预制贴面显示出更高的断裂负荷（p≤0.001），而数字和常规贴面相似（p=0.451）。与 PEEK 20%相比，PEEK 30%填充的断裂负荷更高（p<0.001）。老化对断裂负荷无影响（p=0.176）。关于骨折类型，各组之间无显著差异（p=0.055）。
PEEK 复合材料的填充材料以及贴面技术影响断裂负荷，而老化对断裂负荷没有影响。用预制贴面贴面的 PEEK 30%填充的 FDP 具有最高的断裂阻力。
