Effect of Occlusal Scheme and Bone-Level Implant Number and Position on Stress Distribution in Kennedy Class II Implant-Assisted Removable Partial Dentures: A 3D Finite Element Analysis.

IF 1.7 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Clinical and Experimental Dental Research Pub Date : 2025-02-01 DOI:10.1002/cre2.70078

Solmaz Barati, Safoura Ghodsi, Somayeh Zeighami

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Abstract

Objectives: To assess the effect of occlusion and implant number/position on stress distribution in Kennedy Class II implant-assisted removable partial denture (IARPD).

Materials and methods: IARPDs were designed in six models: with one implant (bone level with a platform of 4 mm and length of 10 mm) at the site of (I) canine, (II) between first and second premolars, (III) first molar, (IV) second molar, or two implants at the sites of (V) canine-first molar, and (VI) canine-second molar. A conventional RPD served as control. Loads were applied according to the group function (GF) (500N load was applied to the left canine/premolar/molar teeth in the ratio of 1:1:2) or canine guidance (CG) (125N load was to the canine tooth) occlusions. Maximum displacement and Von Mises Stress in different components were analyzed by finite element analysis (FEA).

Results: The control model showed the highest displacement followed by the IARPD with a canine implant in both occlusal schemes. In GF, the maximum and minimum jaw stress were recorded in IARPDs with canine implants (16.45 MPa) and canine-first molar implants (13.47 MPa), respectively. In CG, the maximum and minimum jaw stress was recorded in IARPD with first/second premolar implant (15.91 MPa) and canine-first molar implants (12.38 MPa), respectively. The highest stress in resin, framework, and implant(s) was noted in IARPD with canine implant in both schemes. The lowest stress in the implant(s) was recorded in IARPD with canine-second molar implants in GP and IARPD with canine-first molar implants in CG.

Conclusion: Dental implants reduced the total displacement of IARPDs, increased stress in mechanical components, and did not affect stress distribution in biological components. Insertion of two implants decreased implant stress. The GP scheme caused greater stress on mechanical components.

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三维有限元分析Kennedy II类种植辅助可摘局部义齿咬合方案与骨水平种植数量和位置对应力分布的影响

目的：评价咬合和种植体数量/位置对Kennedy II类种植辅助可摘局部义齿（IARPD）应力分布的影响。材料和方法：iarpd设计了六种模型：在(I)犬齿位置放置一个种植体（骨水平，平台为4mm，长度为10mm），（II）第一和第二前磨牙之间，（III）第一磨牙，（IV）第二磨牙，或在(V)犬-第一磨牙和（VI）犬-第二磨牙位置放置两个种植体。常规RPD作为对照。根据组函数（GF）（500N载荷以1:1:2的比例作用于左犬牙/前磨牙/磨牙）或犬引导（CG）（125N载荷作用于犬牙）咬合。采用有限元法分析了不同构件的最大位移和Von Mises应力。结果：在两种咬合方案中，对照模型的位移最大，其次是犬齿种植体的IARPD。在GF中，犬牙种植体和犬牙第一磨牙种植体的iarpd分别记录了最大和最小颌应力（16.45 MPa）和最小颌应力（13.47 MPa）。在CG组中，第一/第二前磨牙种植体IARPD的最大颌应力为15.91 MPa，第一磨牙种植体IARPD的最小颌应力为12.38 MPa。在两种方案中，犬类种植体的IARPD中树脂、框架和种植体的应力均最高。在GP组IARPD组犬第二磨牙种植体和CG组IARPD组犬第一磨牙种植体的种植体应力最低。结论：种植牙减少了iarpd的总位移，增加了机械部件的应力，但不影响生物部件的应力分布。植入两个种植体可减少种植体应力。GP方案对机械部件造成了更大的压力。

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来源期刊

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.