Stress Distribution Pattern in Mandibular Overdenture Designs Supported by Three Dental Implants: A 3D Finite Element Analysis

IF 1.7 Q3 DENTISTRY, ORAL SURGERY & MEDICINE
Negin Aminianpour, Marzieh Alikhasi, Mostafa Shabanpour Kasari, Hashem Yousefi, Hakimeh Siadat
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Abstract

Objectives

The purpose of this study was to assess the implant-supported overdenture stress distribution pattern in cancellous and cortical bone, dental implants, and prosthetic components, and its displacement by using finite element analysis (FEA).

Materials and Methods

An edentulous model of the mandible was designed with three dental implants placed at the sites of canine teeth and the midline. Six groups were designed with isolated (ball and locator) and splinted (conventional bar and a CAD/CAM milled bar with cast and screw ball) attachments with and without a cantilever using SolidWorks 2022 software. The stress distribution pattern in the surrounding bone, implants, and prosthetic components (attachments, caps, housings, and screws) was evaluated following the application of 150 N force vertically and 105 N load with a 30° angle relative to the first molar site using Abaqus/CAE 2021 software. The implant-supported overdenture displacement was also evaluated.

Results

The ball attachment caused the highest stress in the attachments (363 and 896 MPa) and housings (375 and 1187 MPa) under vertical and oblique loadings, and cancellous bone (6 MPa under vertical loading). The pattern of stress distribution was variable following vertical and oblique loading in the cortical bone and dental implants in different groups. The locator attachment resulted in lower stress distribution in bone, implants, and prosthetic components. In splinted groups, the cantilever designs caused lower stress in bone, implants, and prosthetic components in comparison with designs without a cantilever. The conventional and milled bar did not show any mechanical difference.

Conclusion

Considering the stress distribution patterns, the locator attachment is preferred to the ball isolated attachment, and the cantilever design is preferred among the splinted types. Isolated attachments were more effective in controlling the displacement. Also, conventional and milled bars did not show any superiority over each other.

Abstract Image

三种种植体支撑下颌覆盖义齿的应力分布模式:三维有限元分析
目的应用有限元分析(FEA)评价种植覆盖义齿在松质骨和皮质骨、种植体和假体构件中的应力分布规律及其位移。材料与方法设计无牙颌模型,在犬齿和中线位置放置三颗种植体。使用SolidWorks 2022软件设计了六个组,分别使用隔离(球和定位器)和夹板(传统杆和带有铸造和丝杠球的CAD/CAM铣削杆)附件,有或没有悬臂。使用Abaqus/CAE 2021软件,在垂直施加150 N力和相对于第一磨牙位置30°角施加105 N载荷后,评估周围骨、种植体和假体部件(附件、帽、外壳和螺钉)的应力分布模式。对种植覆盖义齿的移位进行了评价。结果球附着体在垂直和斜向载荷下对附着体(363和896 MPa)和外壳(375和1187 MPa)产生的应力最大,松质骨在垂直载荷下产生的应力最大(6 MPa)。不同组皮质骨和种植体在垂直和斜向载荷作用下的应力分布模式不同。定位器的附着降低了骨、植入物和假体部件的应力分布。在夹板组中,与没有夹板组相比,悬臂设计对骨、种植体和假体部件造成的应力更低。常规棒材与铣削棒材的力学性能无明显差异。结论考虑到应力分布规律,定位式附着体优于球形隔离式附着体,悬臂式附着体优于固定式附着体。孤立附着体在控制位移方面更为有效。此外,常规棒材和铣削棒材没有表现出任何优越性。
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来源期刊
Clinical and Experimental Dental Research
Clinical and Experimental Dental Research DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
3.30
自引率
5.60%
发文量
165
审稿时长
26 weeks
期刊介绍: Clinical and Experimental Dental Research aims to provide open access peer-reviewed publications of high scientific quality representing original clinical, diagnostic or experimental work within all disciplines and fields of oral medicine and dentistry. The scope of Clinical and Experimental Dental Research comprises original research material on the anatomy, physiology and pathology of oro-facial, oro-pharyngeal and maxillofacial tissues, and functions and dysfunctions within the stomatognathic system, and the epidemiology, aetiology, prevention, diagnosis, prognosis and therapy of diseases and conditions that have an effect on the homeostasis of the mouth, jaws, and closely associated structures, as well as the healing and regeneration and the clinical aspects of replacement of hard and soft tissues with biomaterials, and the rehabilitation of stomatognathic functions. Studies that bring new knowledge on how to advance health on the individual or public health levels, including interactions between oral and general health and ill-health are welcome.
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