Borges Guilherme Almeida, Mesquita Marcelo Ferraz, Matias Luana Figueiredo da Silva, Barbin Thaís, Machado Leonardo Mendes Ribeiro, Barão Valentim Adelino Ricardo
Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Prosthodontics and Periodontology, Piracicaba, SP, Brazil.
Renato Archer Center for Information Technology, Division of Technologies for Production and Health at the Campinas, SP, Brazil.
Braz Oral Res. 2025 Feb 7;39:e018. doi: 10.1590/1807-3107bor-2025.vol39.018. eCollection 2025.
This study aimed to assess the biomechanical behavior of reinforcement materials [cobalt chromium alloy (CoCr) and carbon fiber-reinforced polyether ether ketone (CFR-PEEK)] and their extensions (short: 15 mm and long: 25 mm) of single implant-retained mandibular overdentures (MO-1) by 3D finite element analysis (FEA), comparing them with MO-1 without a framework. Five models (CoCr-Short, CFR-PEEK-Short, CoCr-Long, CFR-PEEK-Long, and no framework) were created using the McNeel Rhinoceros 3D software, version 7.0. Stress distribution analysis by FEA was performed using the Optstruct solver, and a 30° oblique load (100 N) was applied in the anterior region (50 N on each central incisor). Biomechanical behavior was analyzed by overdenture displacement, maximum (MaxP) and minimum principal (MinP) stress, and von Mises stress. The MO-1 model 'without a framework' produced the largest dislocation, MinP stress on the mucosa, and MaxP stress in the cortical bone. Regardless of the extension of the framework, CFR-PEEK had minor MinP stress in the mucosa and lower overdenture displacement. The 'CoCr-Long' and 'CFR-PEEK-Long' models had higher von Mises stress on the implant housing, and MaxP stress on the O'ring nylon conventional implant and overdenture. The 'CoCr-Short' and ' CFR-PEEK-Short' models showed a greater tendency for tension concentration solely in the framework. The incorporation of a framework into MO-1 decreased stress concentration on the overdenture, resulting in lower stress on the attachment, mucosa, implant, and peri-implant bone, irrespective of the material used. The short framework, however, performed better biomechanically in MO-1, and it is therefore the most recommended option. CFR-PEEK showed favorable biomechanical outcomes, and is suggested for reinforcement of MO-1.
本研究旨在通过三维有限元分析（FEA）评估单种植体固位下颌覆盖义齿（MO-1）的增强材料[钴铬合金（CoCr）和碳纤维增强聚醚醚酮（CFR-PEEK）]及其延伸部分（短：15毫米，长：25毫米）的生物力学行为，并将其与无框架的MO-1进行比较。使用McNeel Rhinoceros 3D软件7.0版创建了五个模型（CoCr-Short、CFR-PEEK-Short、CoCr-Long、CFR-PEEK-Long和无框架）。使用Optstruct求解器通过FEA进行应力分布分析，并在前部区域施加30°斜向载荷（100 N）（每个中切牙上50 N）。通过覆盖义齿位移、最大（MaxP）和最小主（MinP）应力以及von Mises应力分析生物力学行为。“无框架”的MO-1模型产生了最大的脱位、黏膜上的MinP应力以及皮质骨中的MaxP应力。无论框架的延伸情况如何，CFR-PEEK在黏膜中的MinP应力较小，覆盖义齿位移较低。“CoCr-Long”和“CFR-PEEK-Long”模型在种植体窝上具有较高的von Mises应力，在O形环尼龙传统种植体和覆盖义齿上具有较高的MaxP应力。“CoCr-Short”和“CFR-PEEK-Short”模型仅在框架中显示出更大的张力集中趋势。在MO-1中加入框架可降低覆盖义齿上的应力集中，从而降低附着体、黏膜、种植体和种植体周围骨上的应力，无论使用何种材料。然而，短框架在MO-1中的生物力学性能更好，因此是最推荐的选择。CFR-PEEK显示出良好的生物力学结果，建议用于MO-1的增强。
