Finite Element Assessment of a Novel Patient-Specific Mandibular Implant for Severely Atrophic Ridge.

IF 2.6 3区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
BioMed Research International Pub Date : 2024-08-29 eCollection Date: 2024-01-01 DOI:10.1155/2024/9735427
Alireza Parhiz, Reza Nourishirazi, Amirali Asadi, Morad Karimpour
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Abstract

Purpose: Dental reconstruction for patients diagnosed with severe mandibular bone atrophy using common dental implants is a challenging process. In such cases, surgeons may encounter challenges such as insufficient available bone, soft tissue, damage to the inferior alveolar nerve, and even the risk of bone fracture. In this study, a new design concept of mandibular patient-specific implants for severely atrophic ridges followed by finite element evaluation was presented to investigate the mechanical functionality of the concept. Method: The implant is comprised of two modular parts including an inferior border cover and a horseshoe-shaped structure. This horseshoe segment fits into the cover and is then screwed to it using two screws on each side. A 1 mm deflection was applied to a reference point located between the two anterior posts to extract the resulting Von Mises stress distribution in each part and the reaction force on the reference point which corresponds to the chewing force that the patient must apply to deform the horseshoe. This 1 mm gap is a design consideration and critical distance that horseshoe contacts the gingiva and disturbs the alveolar nerve. Results: The results revealed that load was transmitted from the horseshoe to the cover, and there were no stress contours on the body of the mandible. However, stress concentration was observed in screw locations in the mandible, the amount of which was decreased by increasing the number of used screws. In horseshoe, stress concentration values were around 350 MPa, and the measured reaction force on the reference point was just under 200 N. Conclusion: The finite element analysis results showed that this concept would be functional as the minimum load would be transmitted to the mandibular ridge, and since the patients diagnosed with atrophic ridge are not able to apply load to an amount near 200 N, the horseshoe would not contact the gingiva. Also, it is concluded that increasing the number of bone screw fixations would decrease the risk of long-term screw loosening.

针对严重萎缩牙槽骨的新型下颌骨植入体的有限元评估
目的:使用普通牙科种植体对被诊断为下颌骨严重萎缩的患者进行牙科重建是一个具有挑战性的过程。在这种情况下,外科医生可能会遇到可用骨量不足、软组织、下牙槽神经损伤甚至骨裂风险等挑战。本研究提出了一种针对严重萎缩牙脊的下颌特定患者种植体的新设计理念,并对其进行了有限元评估,以研究该理念的机械功能。方法:该种植体由两个模块组成,包括一个下缘盖和一个马蹄形结构。该马蹄形部分与下缘盖相吻合,然后通过两侧的两个螺钉将其拧紧。在位于两个前柱之间的参考点上施加 1 毫米的偏差,以提取每个部分的 Von Mises 应力分布以及参考点上的反作用力,该反作用力相当于患者必须施加的咀嚼力才能使马蹄形发生变形。这 1 毫米的间隙是设计时考虑的因素,也是马蹄铁接触牙龈和干扰牙槽神经的关键距离。结果结果显示,负荷从马蹄形传递到盖板,下颌骨体上没有应力轮廓。然而,在下颌骨的螺钉位置观察到了应力集中,随着使用螺钉数量的增加,应力集中的程度有所降低。在马蹄形部位,应力集中值约为 350 兆帕,在参考点测得的反作用力略低于 200 牛。结论有限元分析结果表明,这一概念是可行的,因为最小的负荷将传递到下颌嵴,而且由于被诊断为萎缩性嵴的患者无法施加接近 200 N 的负荷,马蹄形不会接触到牙龈。此外,结论是增加骨螺钉固定的次数可降低长期螺钉松动的风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
BioMed Research International
BioMed Research International BIOTECHNOLOGY & APPLIED MICROBIOLOGY-MEDICINE, RESEARCH & EXPERIMENTAL
CiteScore
6.70
自引率
0.00%
发文量
1942
审稿时长
19 weeks
期刊介绍: BioMed Research International is a peer-reviewed, Open Access journal that publishes original research articles, review articles, and clinical studies covering a wide range of subjects in life sciences and medicine. The journal is divided into 55 subject areas.
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