Srivastava Roopal, Bansal Rajesh, Dubey Pavan Kumar, Singh Deepak
Prosthodontics, Faculty of Dental Sciences, IMS BHU, Varanasi, India.
Department of Orthodontics and Dentofacial Orthopaedics, Maulana Azad Institute of Dental Sciences, New Delhi, India.
J Oral Biol Craniofac Res. 2024 May-Jun;14(3):284-289. doi: 10.1016/j.jobcr.2024.03.010. Epub 2024 Apr 2.
To identify the optimal number and position of implants to reduce stress concentration on the implant, denture, and attachment system for sustaining an overdenture prosthesis.
By incorporating one to eight indigenous implants with bar-type attachments, eight 3D finite element models of mandibular overdentures were created. All models received a 200 N vertical load, and the biomechanical characteristics of peri-implant bone were assessed.
The study observed that with a vertical load of 200 N, the maximum equivalent stress around peri-implant tissue in all models was within the physiological tolerance threshold of bone. The von Mises stress values ranged from 116.18 MPa to 536.7 MPa.
The three-implant-supported overdenture model revealed superior peri-implant stress, stability, cost-effectiveness, and hygiene maintenance outcomes. Placing a third implant in the mid-symphysis region may offer a practical solution to reduce rotations in two-implant-supported overdentures.
确定种植体的最佳数量和位置，以减少种植体、义齿和附着系统上的应力集中，从而维持覆盖义齿修复体。
通过将1至8个国产种植体与杆式附着体相结合，创建了8个下颌覆盖义齿的三维有限元模型。所有模型均承受200 N的垂直载荷，并评估种植体周围骨组织的生物力学特性。
研究观察到，在200 N垂直载荷下，所有模型中种植体周围组织的最大等效应力均在骨组织的生理耐受阈值范围内。冯·米塞斯应力值范围为116.18 MPa至536.7 MPa。
三种植体支持的覆盖义齿模型在种植体周围应力、稳定性、成本效益和卫生维护方面表现更优。在正中联合区植入第三枚种植体可能是减少双种植体支持覆盖义齿旋转的一种实用解决方案。
