Int J Oral Maxillofac Implants. 2021 Mar-Apr;36(2):332-340. doi: 10.11607/jomi.9007.
This study aimed to assess the fracture resistance of zirconia (Zr), reinforced polyetheretherketone (PEEK), and polyetherketoneketone (PEKK) implant abutments restored with glass-ceramic crowns after thermomechanical aging.
Zr, reinforced PEEK, and PEKK titanium base abutments were divided into three groups (n = 10). CAD/CAM maxillary central incisor crowns were fabricated using monolithic lithium disilicate and luted to the abutments using resin cement. The specimens were thermomechanically aged (1.2 × 10 cycles, 49 N, 5°C to 55°C). After testing fracture strength and determining fracture patterns, statistical analyses were made using the one-way analysis of variance (ANOVA) and Tukey post hoc tests (α = .05).
Fracture resistance of the PEKK abutments (541.90 ± 68.49 N) was significantly lower than the Zr (780.65 ± 105.77 N) and reinforced PEEK (741.09 ± 99.84 N) abutments (P = .000). A significant discrepancy was not detected between the reinforced PEEK and Zr abutments. Failures usually formed due to crown or abutment fracture, plastic deformation of the titanium base or screw fracture in the Zr group, crown fracture or separation of the abutment-crown complex from the titanium base in the reinforced PEEK group, and abutment fracture without crown deformation in the PEKK group.
After thermomechanical aging, the reinforced PEEK abutments exhibited similar fracture resistance to the Zr abutments. All abutment types withstood the physiologic occlusal forces typical for the oral anterior region. Before considering them as alternative esthetic implant abutment materials, further in vitro and clinical studies are needed to determine their long-term performance.
本研究旨在评估经热机械老化后用玻璃陶瓷冠修复的氧化锆（Zr）增强聚醚醚酮（PEEK）和聚醚酮酮（PEKK）种植体基台的抗折强度。
将 Zr、增强 PEEK 和 PEKK 钛基基台分为三组（n = 10）。使用整体式二硅酸锂 CAD/CAM 制作上颌中切牙冠，并使用树脂水门汀黏结到基台上。对试件进行热机械老化（1.2×10 次循环，49 N，5°C 至 55°C）。测试断裂强度并确定断裂模式后，使用单向方差分析（ANOVA）和 Tukey 事后检验（α=0.05）进行统计分析。
PEKK 基台的抗折强度（541.90±68.49 N）明显低于 Zr（780.65±105.77 N）和增强 PEEK（741.09±99.84 N）基台（P=0.000）。增强 PEEK 和 Zr 基台之间未检测到显著差异。Zr 组的失效通常是由于冠或基台断裂、钛基底的塑性变形或螺丝断裂引起的，增强 PEEK 组的失效通常是由于冠断裂或基台-冠复合体与钛基底分离引起的，PEKK 组的失效则是由于基台断裂而冠无变形引起的。
经热机械老化后，增强 PEEK 基台的抗折强度与 Zr 基台相似。所有基台类型均能承受口腔前区典型的生理性咬合力。在考虑将它们作为替代美观种植体基台材料之前，需要进一步进行体外和临床研究，以确定其长期性能。
