Associate professor, Dental Research Center, Dentistry Research Institute, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Fellowship in Implant Dentistry, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, International Campus, Tehran, Iran.
J Prosthet Dent. 2021 Mar;125(3):501.e1-501.e6. doi: 10.1016/j.prosdent.2020.10.013. Epub 2020 Nov 25.
New materials have been developed for digital processing, including implant abutments, but studies on their mechanical properties are lacking.
The purpose of this in vitro study was to compare the effect of aging on the fracture resistance, failure mode, and torque loss of restorations made of zirconia and ceramic-reinforced polyetheretherketone (PEEK) abutments with titanium bases.
Titanium-based PEEK and zirconia abutments were milled and veneered with composite resin or feldspathic porcelain in the form of maxillary first premolars (n=10). All the specimens were subjected to an aging process and were assessed after every 250 000 cycles under a stereomicroscope, and torque loss was recorded with an electronic torque meter. Fracture resistance was measured under static load (crosshead speed of 1 mm/min), and failure modes and final torque were determined. A t test was conducted for statistical analyses (α=.05).
The fracture resistance of the zirconia restorations was significantly greater than the PEEK-based restorations (P=.001). Torque losses were not significantly different after aging (P=.18); however, significant difference was recorded after the fracture test (P=.007). The effect of fracture load was significantly greater for the zirconia group (P<.001). Unlike with the zirconia group, the failure mode in the PEEK-based restorations was mainly adhesive and favorable (9 of 10 specimens).
Ceramic-reinforced PEEK abutments had acceptable resistance to fracture, a favorable failure mode, and successfully sustained the aging process.
已经开发出用于数字处理的新材料，包括种植体基台，但缺乏对其机械性能的研究。
本体外研究的目的是比较具有钛基底的氧化锆和陶瓷增强聚醚醚酮（PEEK）基台修复体在老化对其抗断裂能力、失效模式和扭矩损失的影响。
用复合树脂或长石质瓷在形式上制作钛基 PEEK 和氧化锆基台上颌第一前磨牙（n=10）。所有样本都经过老化处理，在体视显微镜下每 250000 次循环评估一次，并使用电子扭矩计记录扭矩损失。在静态负载（十字头速度为 1mm/min）下测量抗断裂能力，并确定失效模式和最终扭矩。使用 t 检验进行统计分析（α=.05）。
氧化锆修复体的抗断裂能力明显大于 PEEK 基修复体（P=.001）。老化后扭矩损失无显著差异（P=.18）；然而，在断裂试验后记录到显著差异（P=.007）。对于氧化锆组，断裂载荷的影响明显更大（P<.001）。与氧化锆组不同，PEEK 基修复体的失效模式主要为黏附性和有利性（10 个样本中有 9 个）。
陶瓷增强 PEEK 基台具有可接受的抗断裂能力、有利的失效模式，并成功经受住了老化过程。
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