Abdelmohsen Nour, Wahsh Marwa, Zohdy Maged, Abdelfattah Ghada, Alhotan Abdulaziz, Refaie Ashraf, Bourauel Christoph, Elshazly Tarek M
Department of Fixed Prosthodontics, Faculty of Dentistry, University of Ain Shams, Cairo, Egypt.
Dental School, Oral Technology, University Hospital Bonn, Welschnonnenstr. 17, 53111, Bonn, Germany.
Odontology. 2025 Mar 15. doi: 10.1007/s10266-025-01084-7.
To compare experimentally the failure modes of endodontically treated teeth restored with custom-made polyetheretherketone (PEEK) post-core (milled and pressed) to those restored with the standard technique of customized fiberglass posts with composite cores, and to analyze numerically stress distribution patterns in each system using the finite element analysis (FEA). Experimentally, 21 mandibular premolars were endodontically treated, prepared for post-restoration, mounted in resin mold, decapitated, and assigned to three groups: M (milled PEEK), P (pressed PEEK), and C (control group; ready-made fiberglass posts customized with resin composite). All post-core restorations were cemented and subjected to thermocycling. Failure modes were visually evaluated after fracture by means of a universal testing machine. Numerically, stress analysis was assessed using FEA, based on digital models designed to replicate the experimental setup. Milled PEEK posts showed a uniformly favorable failure mode across all specimens (100%), whereas pressed PEEK and customized fiberglass posts displayed more variable failure modes, yet with a higher proportion of favorable outcomes. Numerically, the highest VME stress values were in the cervical half of the post area (up to 62.7 MPa), with minimal differences between milled and pressed PEEK posts. PEEK posts had greater stress concentrations in the cervical area of the post area, while fiberglass posts showed slightly higher stress in the middle and apical areas. Custom-made milled and pressed PEEK posts are effective for restoring endodontically treated teeth, with milled PEEK posts showing the most favorable failure mode and stress distribution pattern.
通过实验比较用定制聚醚醚酮（PEEK）桩核（铣削和压制）修复的根管治疗牙与用定制玻璃纤维桩加复合树脂核的标准技术修复的根管治疗牙的失败模式，并使用有限元分析（FEA）对每个系统中的应力分布模式进行数值分析。实验方面，选取21颗下颌前磨牙进行根管治疗，预备桩修复，固定于树脂模型中，截冠，并分为三组：M组（铣削PEEK）、P组（压制PEEK）和C组（对照组；用树脂复合材料定制的成品玻璃纤维桩）。所有桩核修复体均进行粘结并进行热循环处理。通过万能试验机在断裂后对失败模式进行视觉评估。数值方面，基于设计用于复制实验装置的数字模型，使用FEA评估应力分析。铣削PEEK桩在所有样本中均呈现出一致良好的失败模式（100%），而压制PEEK桩和定制玻璃纤维桩的失败模式则更多样化，但良好结果的比例更高。数值上，桩区域颈段的最大冯米塞斯应力值最高（可达62.7MPa），铣削和压制PEEK桩之间差异最小。PEEK桩在桩区域的颈段应力集中更大，而玻璃纤维桩在中段和根尖段的应力略高。定制的铣削和压制PEEK桩对根管治疗牙的修复有效，其中铣削PEEK桩表现出最有利的失败模式和应力分布模式。
