Prosthodontics Clinic, Batman Oral and Dental Health Center, Batman, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Firat University, Elazig, Turkey.
PeerJ. 2024 Sep 5;12:e18012. doi: 10.7717/peerj.18012. eCollection 2024.
The aim of this study was to compare the fracture strength and fracture modes of post-cores produced with CAD-CAM from modified polyetheretherketone (PEEK) materials with other custom-produced post-cores.
Sixty human mandibular first premolars with equal root sizes were used. The teeth were divided into six groups ( = 10), and root canal treatment was performed. The teeth were separated from the roots over 2 mm from the cemento-enamel junction. As a result of the decoronation process, a 1 mm wide shoulder line was obtained for all teeth. For the fracture strength test, 10 mm deep post spaces were created on the teeth with a 1.6 mm diameter driller. Post-core groups consisted: everStick glass fiber post-core (Group GF), zirconia post-core (Group Z), metal (Cr-Co) post-core (Group M), PEEK post-core without filler (Group UP), PEEK post-core with 20% TiO Filler (Group TP), and post-core with 20% ceramic filler (Group CP). Following the application of posts to post spaces, copings were created and cemented on the samples. With the universal tester, a force was applied to the long axis of the tooth with a slope of 135°. The mean fracture strength (N) between the groups was statistically evaluated using one-way ANOVA, and pairwise mean differences were detected using post hoc Tukey's HSD test among the groups.
According to the results of the statistical analysis, a significant difference was found between the groups in terms of mean fracture resistance ( < 0.05). Group Z (409.34 ± 45.72) was significantly higher than Group UP (286.64 ± 37.79), CP (298.00 ± 72.30), and TP (280.08 ± 67.83). Group M (376.17 ± 73.28) was significantly higher than Group UP (286.64 ± 37.79) and Group TP (280.08 ± 67.83). There were no statistically significant differences between the means of the other groups ( > 0.05). Among all the groups, Group Z exhibited a higher prevalence of repairable failure modes, while the rest of the groups predominantly experienced irreparable failure modes.
In our study, zirconia and metal post-core samples showed higher average fracture strength values than PEEK post-cores groups. Repairable failure modes were more common in the zirconia post-cores, whereas the opposite was observed in the other groups. Further experimental and clinical trial studies are needed before PEEK materials can be used as post materials in the clinic.
本研究旨在比较 CAD-CAM 制作的改性聚醚醚酮（PEEK）材料与其他定制制作的后牙核的断裂强度和断裂模式。
使用 60 颗具有相同根管尺寸的下颌第一前磨牙。将牙齿分为六组（每组 10 颗），进行根管治疗。牙齿从牙釉质-牙骨质界上方 2mm 处与牙根分离。由于去冠过程，所有牙齿均获得 1mm 宽的肩线。为了进行断裂强度测试，使用直径为 1.6mm 的钻头在牙齿上制备 10mm 深的后牙腔。后牙核组包括：everStick 玻璃纤维后牙核（组 GF）、氧化锆后牙核（组 Z）、金属（Cr-Co）后牙核（组 M）、无填料 PEEK 后牙核（组 UP）、填料为 20%TiO 的 PEEK 后牙核（组 TP）和填料为 20%陶瓷的后牙核（组 CP）。在后牙腔中植入后牙核后，在样本上制作牙冠并粘固。使用万能试验机，以 135°的斜率向牙齿的长轴施加力。使用单因素方差分析对组间平均断裂强度（N）进行统计学评估，并用事后 Tukey HSD 检验检测组间平均差异。
根据统计分析结果，组间平均抗断裂强度存在显著差异（<0.05）。组 Z（409.34±45.72）明显高于组 UP（286.64±37.79）、CP（298.00±72.30）和 TP（280.08±67.83）。组 M（376.17±73.28）明显高于组 UP（286.64±37.79）和组 TP（280.08±67.83）。其他组之间的平均值没有统计学差异（>0.05）。在所有组中，组 Z 表现出更高的可修复失效模式发生率，而其他组则主要表现为不可修复失效模式。
在我们的研究中，氧化锆和金属后牙核样本的平均断裂强度值高于 PEEK 后牙核组。在氧化锆后牙核中更常见可修复的失效模式，而在其他组中则相反。在临床上将 PEEK 材料用作后牙材料之前，需要进一步进行实验和临床试验研究。
