The analysis of the stress distribution around angulated and parallelly placed implants based on “all on 4 concept” and four implants placed parallel within the interforaminal distance in an edentulous mandible – An in vitro three-dimensional finite element analysis

Minal Mahantshetty, Prafulla Thumati, Mounika Ayinala
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引用次数: 2

Abstract

Purpose: The purpose of the study was to analyze and compare the stress distribution in the so-called All-on-Four concept where two anterior implants were placed parallel to each other and two posterior implants were tilted at 45° angle against the four parallelly placed implants within the interforaminal distance in an edentulous mandible. Materials and Methods: The three-dimensional finite element analysis models consisted of cancellous bone surrounded by the cortical bone, four dental implants positioned in two different designs – i.e., four parallelly placed implants (Model 1) and All-on-Four concept (Model 2) with hybrid superstructures comprising of a Hader bar. The vertical (60N, 130N, and 300N) and lateral (20N, 45N, and 100N) loading protocols were considered and von Mises stress values were determined. Results: On vertical and lateral loading, lower stress concentrations were observed in the peri-implant region in Model 2. However, there was higher stress concentration noticed on cortical, cancellous bone and bar attachment due to the tilting of implants in every condition. Conclusion: Within the limitations of the study, All-on-Four concept is an optimal and viable treatment option if executed accurately as it reduces the cantilever length, reduces stress concentrations in the peri-implant region, and is cost-effective.
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基于“全上4”概念及椎间间距内平行放置4个种植体的无牙下颌骨成角种植体和平行放置种植体周围应力分布分析——体外三维有限元分析
目的:本研究的目的是分析和比较无牙下颌骨在椎间间距离内,将两个前牙种植体平行放置,两个后牙种植体以45°角度倾斜以对抗四个平行放置的种植体的所谓All-on-Four概念的应力分布。材料和方法:三维有限元分析模型包括被皮质骨包围的松质骨,四个牙种植体以两种不同的设计定位-即四个平行放置的种植体(模型1)和All-on-Four概念(模型2),上部结构由Hader棒组成。考虑了垂直(60N、130N和300N)和横向(20N、45N和100N)加载方案,并确定了von Mises应力值。结果:在垂直和侧向加载下,模型2种植周区域的应力浓度较低。然而,在每种情况下,由于种植体倾斜,在皮质骨、松质骨和棒附着体上都有较高的应力集中。结论:在本研究的限制范围内,如果执行准确,All-on-Four概念是一种最佳和可行的治疗选择,因为它减少了悬臂长度,减少了种植周围区域的应力集中,并且具有成本效益。
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