Aguir Hamdi, Mabrouk Yosra, Chamekh Rayene, Saadellaoui Ines
Mechanical Engineering Laboratory (LGM), National Engineering School of Monastir (ENIM), University of Monastir, Tunisia.
Removable Prosthetics Department, ABCDF Laboratory, Faculty of Dental Medicine, University of Monastir, Tunisia.
Heliyon. 2023 Jul 8;9(7):e17956. doi: 10.1016/j.heliyon.2023.e17956. eCollection 2023 Jul.
The aim of this study was to define the relation between load distribution and the number of implants supporting mandibular implant-supported screw-retained complete prostheses (ISCP). It is a three-dimensional (3-D) finite element study. Three models were simulated. The first one represents a 4-implant supported prosthesis (4ISP), the second one is a 3-implant supported prosthesis (3ISP) and the third one is a 6-implant supported prosthesis (6ISP). The 6ISP model showed the best bone stress distribution among all models. Its maximum stress value was 63.3 MPa. The 4ISP (98.9 MPa) showed a better bone stress distribution than the 3ISP (122.9 MPa). A flexion of the prosthesis was more important for the 4ISP than 3ISP and then 6ISP model at 10 MPa. In the 4 ISP and the 3ISP models, the anterior implants were more solicited. However, the stress was evenly distributed on the 6 implants, in the 6ISP model. Concerning, the stress distribution in bone, the uppermost stress was found in the 3ISP, then the 4ISP and then the 6ISP model. The increase of implants number reduces the stress on the bone and prosthesis and implants. The use of 6 implants to support screw-retained complete prostheses showed a better biomechanical behavior.
本研究的目的是确定负荷分布与支持下颌种植体支持的螺丝固位全口义齿（ISCP）的种植体数量之间的关系。这是一项三维（3-D）有限元研究。模拟了三种模型。第一个代表4种植体支持的义齿（4ISP），第二个是3种植体支持的义齿（3ISP），第三个是6种植体支持的义齿（6ISP）。6ISP模型在所有模型中显示出最佳的骨应力分布。其最大应力值为63.3MPa。4ISP（98.9MPa）比3ISP（122.9MPa）显示出更好的骨应力分布。在10MPa时，义齿的弯曲对4ISP模型比3ISP模型更重要，对6ISP模型则更不重要。在4ISP和3ISP模型中，前部种植体受力更大。然而，在6ISP模型中，应力在6颗种植体上均匀分布。关于骨中的应力分布，3ISP模型中应力最高，其次是4ISP模型，然后是6ISP模型。种植体数量的增加会降低骨、义齿和种植体上的应力。使用6颗种植体支持螺丝固位全口义齿显示出更好的生物力学性能。
