Bilgi-Ozyetim Esra, Dinçer Gökçen, Sulaiman Ammar, Dayan Süleyman Çağatay, Kurtulmus-Yilmaz Sevcan, Geçkili Onur
Department of Prosthodontics, Faculty of Dentistry, Istanbul Yeni Yuzyil University, Istanbul, Türkiye.
Department of Prosthodontics, Faculty of Dentistry, Istanbul University, Istanbul, Türkiye.
BMC Oral Health. 2025 Jul 19;25(1):1213. doi: 10.1186/s12903-025-06610-1.
This study aims to evaluate the stress distribution in peri-implant bone, implant surfaces, and within the framework material under vertical and oblique loads, considering various angulations and abutment types of bendable one-piece implants in the All-on-4 concept.
A three-dimensional model of an edentulous mandible was constructed. Six different configurations were modeled according to prosthesis connection type and inclination of the posterior implants based on the All-on-4 protocol. Four one-piece implants were placed in each model and a cobalt-chromium frameworks with 14 mm cantilever lengths were designed. Under vertical and oblique loading conditions, maximum principal stress and minimum principal stress values were obtained for cortical and trabecular bone and von Mises stress values were calculated for implants and frameworks.
Implant angulation, connection type, and loading conditions affected stress distribution in the peri-implant bone, implants, and frameworks. Higher stress values were observed in posterior implants with increased angulation. Screw-retained models demonstrated greater stress values compared to cement-retained ones under both loading conditions.
For optimal stress distribution in peri-implant bone and frameworks, cement-retained prosthesis may be preferred, especially in cases with increased implant angulation in one-piece bendable systems. Additionally, careful consideration of posterior implant angulation and loading conditions is crucial to minimize the excessive stress and to enhance long-term stability.
Not applicable.
本研究旨在评估在全口4颗种植体理念中，考虑可弯曲一体式种植体的各种角度和基台类型，在垂直和斜向载荷下种植体周围骨组织、种植体表面以及支架材料内的应力分布情况。
构建无牙下颌骨的三维模型。根据全口4颗种植体方案，依据修复体连接类型和后牙种植体的倾斜度对六种不同构型进行建模。每个模型植入4颗一体式种植体，并设计悬臂长度为14毫米的钴铬合金支架。在垂直和斜向加载条件下，获取皮质骨和松质骨的最大主应力和最小主应力值，并计算种植体和支架的冯·米塞斯应力值。
种植体角度、连接类型和加载条件会影响种植体周围骨组织、种植体及支架的应力分布。角度增加时，后牙种植体的应力值更高。在两种加载条件下，螺丝固位模型的应力值均高于粘结固位模型。
为使种植体周围骨组织和支架达到最佳应力分布，粘结固位修复体可能更为可取，尤其是在一体式可弯曲系统中种植体角度增加的情况下。此外，仔细考虑后牙种植体角度和加载条件对于最小化过大应力及提高长期稳定性至关重要。
不适用。
