Statement of problem

Whether providing an occlusal device for a patient with bruxism and an implant-supported fixed dental prosthesis leads to improved biomechanics is unclear.

Purpose

The purpose of this 3D finite element analysis (FEA) study was to evaluate the biomechanical behavior of 3-unit implant-supported prostheses under parafunctional forces with and without an occlusal device.

Materials and methods

Eight 3D models consisting of a posterior (type IV) maxillary bone block with 3 external hexagon implants (Ø4.0×7.0 mm) and 3-unit implant-supported prostheses with different crown connections (splinted or unsplinted) and an occlusal device under functional and parafunctional loading were simulated. The abutment screws were evaluated by von Mises stress maps, and the bone tissue by maximum principal stress and microstrain maps by using a finite element software program.

Results

An occlusal device improved the biomechanical behavior of the prostheses by reducing stress in the abutment screws and stress and strain in the bone tissue. However, the use of an occlusal device was not sufficiently effective to negate the biomechanical benefit of splinting.

Conclusions

The use of splinted crowns in the posterior maxillary region with an occlusal device was the most effective method of reducing stress in the abutment screws and stress and strain in the bone tissue when parafunction was modeled.

中文翻译：

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辅助功能负载下种植体支持固定义齿患者的咬合装置的生物力学效应：3D 有限元分析

问题陈述

为磨牙症患者提供咬合装置和种植体支撑的固定义齿是否能改善生物力学尚不清楚。

目的

这项 3D 有限元分析 (FEA) 研究的目的是评估 3 单元种植体支持假体在使用和不使用咬合装置的辅助功能作用下的生物力学行为。

材料和方法

八个 3D 模型，包括带有 3 个外六角种植体 (Ø4.0×7.0 mm) 的后（IV 型）上颌骨块和具有不同牙冠连接（夹板或非夹板）的 3 单元种植体支撑假体和功能下的咬合装置和超功能负荷进行了模拟。基台螺钉通过 von Mises 应力图进行评估，骨组织通过使用有限元软件程序的最大主应力和微应变图进行评估。

结果

咬合装置通过减少基台螺钉中的应力以及骨组织中的应力和应变来改善假体的生物力学行为。然而，使用咬合装置并不足以抵消夹板的生物力学益处。

结论

在对副功能进行建模时，在上颌后部区域使用夹板牙冠和咬合装置是减少基台螺钉应力和骨组织应力和应变的最有效方法。