Department of Prosthodontics, Presidente Prudente Dental School, University of Western São Paulo - UNOESTE, Presidente Prudente, Brazil.
Department of Diagnosis and Surgery, Araçatuba Dental School, São Paulo State University Júlio de Mesquita Filho-UNESP, Araçatuba, Brazil.
J Prosthodont. 2024 Aug;33(7):706-713. doi: 10.1111/jopr.13763. Epub 2023 Sep 25.
The purpose of this 3D finite element analysis was to evaluate the biomechanical effects of different materials used to fabricate occlusal devices to achieve stress distribution in simulated abutment screws, dental implants, and peri-implant bone tissue in individuals who clench their teeth.
Eight 3D models simulated a posterior maxillary bone block with three external hexagon implants (Ø4.0 × 7.0 mm) supporting a 3-unit screw-retained metal-ceramic prosthesis with different crown connection (splinting), and the use of an occlusal device (OD). The OD was modeled to be 2-mm thick. ANSYS 19.2 software was used to generate the finite-element models in the pre-and post-processing phases. Simulated abutment screws and dental implants were evaluated by von Mises stress maps, and simulated bone was evaluated by maximum principal stress and microstrain maps by using a finite element software program.
The highest stress values in the dental implants and screws were observed in single crowns without OD (M1). Furthermore, the highest stress values and bone tissue strain were found in single crowns without OD (M1). The simulated material for the OD did not cause many discrepancies in terms of the stress magnitude in the simulated dental implant and abutment screw for both single and splinted crowns; however, more rigid materials exhibited lower stress values.
The use of OD was effective in reducing stress in the simulated implants and abutment screws and stress and strain in the simulated bone tissue. The material used to simulate the OD influenced the biomechanical behavior of implant-supported fixed prostheses, whereas splints with rigid materials such as PEEK and PMMA exhibited better biomechanical behavior.
本 3D 有限元分析的目的是评估用于制作咬合装置的不同材料的生物力学效应，以实现模拟基牙螺钉、牙种植体和种植体周围骨组织中磨牙患者的应力分布。
八个 3D 模型模拟了一个上颌后骨块，有三个外六方植入物（Ø4.0×7.0mm）支撑一个带有三个单位螺丝固位金属陶瓷修复体的修复体，使用一个咬合装置（OD）。OD 被建模为 2mm 厚。ANSYS 19.2 软件用于在预和后处理阶段生成有限元模型。通过 von Mises 应力图评估模拟基牙螺钉和牙种植体，通过有限元软件程序评估模拟骨的最大主应力和微应变图。
在没有 OD（M1）的单冠中观察到牙种植体和螺钉的最高应力值。此外，在没有 OD（M1）的单冠中发现了最高的应力值和骨组织应变。OD 的模拟材料对单冠和带夹板冠的模拟牙种植体和基牙螺钉的应力值没有太大差异；然而，更刚性的材料表现出较低的应力值。
使用 OD 可有效降低模拟种植体和基牙螺钉的应力以及模拟骨组织的应力和应变。用于模拟 OD 的材料影响种植体支持固定修复体的生物力学行为，而具有 PEEK 和 PMMA 等刚性材料的夹板表现出更好的生物力学行为。
