Kharboush Mohamed G A, Othman Hesham I, Aldamaty Mohamed F, Alameldin Ahmed M L
Department of Fixed Prosthodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, 11651, Egypt.
Department of Restorative and Aesthetic Dentistry, College of Dentistry, Almaaqal University, Basrah, Iraq.
BMC Oral Health. 2025 Jan 8;25(1):40. doi: 10.1186/s12903-024-05232-3.
The current study aimed to compare modified Polyether-ether-ketone's fracture resistance and failure mode versus lithium disilicate glass-ceramic endocrowns.
A total of 16 butt-joint endocrown specimens on mandibular second molar teeth were fabricated and divided into two equivalent groups; Pressable modified Polyether-ether-ketone (PEEK) (BioHPP) and Pressable lithium disilicate glass ceramic (IPS e.max Press). A computer-aided design/computer-aided manufacturing system was used to digitally create and milled wax patterns. Final restorations were cemented each to its corresponding prepared tooth. Thermomechanical cycling loading representing one year of clinical service was done in a chewing simulator. Fracture resistance was evaluated utilizing a universal testing machine. The failure mode was evaluated by inspecting fractured surfaces using a Stereomicroscope and further examined by a Scanning Electron Microscope (SEM) amongst both groups.
A statistically significant variation in fracture resistance was recorded with a mean load of (2762.96 ± 216.15 N) for modified PEEK and (2175.91 ± 267.72 N) for lithium disilicate glass-ceramic endocrowns.
Modified PEEK endocrowns have higher fracture resistance than lithium disilicate glass-ceramic endocrowns. Moreover, the likeliness of catastrophic fracture in molars receiving endodontic treatment restored by modified PEEK is less than teeth restored with lithium disilicate glass ceramics.
本研究旨在比较改性聚醚醚酮与二硅酸锂玻璃陶瓷全瓷内冠的抗折性及失效模式。
在下颌第二磨牙上制作16个对接式全瓷内冠试件，并将其分为两组，每组数量相等；可压制改性聚醚醚酮（PEEK）（BioHPP）组和可压制二硅酸锂玻璃陶瓷（IPS e.max Press）组。使用计算机辅助设计/计算机辅助制造系统进行数字化创建并铣削蜡型。将最终修复体分别粘固到相应的预备牙上。在咀嚼模拟器中进行代表一年临床使用的热机械循环加载。使用万能试验机评估抗折性。通过体视显微镜检查断裂表面评估失效模式，并在两组中进一步使用扫描电子显微镜（SEM）进行检查。
记录到抗折性存在统计学显著差异，改性聚醚醚酮的平均载荷为（2762.96 ± 216.15 N），二硅酸锂玻璃陶瓷全瓷内冠的平均载荷为（2175.91 ± 267.72 N）。
改性聚醚醚酮全瓷内冠的抗折性高于二硅酸锂玻璃陶瓷全瓷内冠。此外，接受根管治疗的磨牙用改性聚醚醚酮修复时发生灾难性骨折的可能性低于用二硅酸锂玻璃陶瓷修复的牙齿。
