Abstract
Two-implant-retained mandibular overdentures with magnetic attachments can provide an effective treatment modality for edentulous patients. In this study, a three-dimensional finite element analysis was used to compare the biomechanical characteristics of three different types of magnetic attachments in two-implant-retained mandibular overdentures. Flat-type, dome-type, and cushion-type of the magnetic attachments were designed to retain the overdenture. Four types of load were applied to the overdenture in each model: 100 N vertical and oblique loads on the right first molar and a 100 N vertical load on the right canine and the lower incisors. The biomechanical behaviors of peri-implant bone, abutment, and mucosa were recorded. In vertical incisors, vertical right canine, and oblique molar loading condition, the flat-type group exhibited the highest levels of maximum equivalent strain/stress in the peri-implant bone. The total deformation of mucosa and the maximum equivalent strain/stress in the oblique molar loading condition are about two times as the vertical molar loading condition. These results suggested that both cushion-type and dome-type of the magnetic attachments are better choices in two-implant-retained mandibular overdentures, and oblique loading is more harmful than vertical loading.
Highlights
IntroductionPrevious studies using strain gauge analyses displayed lower lateral stress distribution for overdentures retained by cushion-type magnetic attachment than did the flat-type [11], while others showed similar effect on the denture movement and lateral stresses between the three types of magnetic attachments [3]
Fengling Hu,1,2 Yiming Gong,2 Zhen Bian,1 Xiaoying Zhang,1 Bin Xu,1 Jianguo Zhang,3 Xiaojun Shi,1 Youcheng Yu,2 and Liang Song 1
Vertical right canine, and oblique molar loading condition, the flat-type group exhibited the highest levels of maximum equivalent strain/stress in the peri-implant bone. e total deformation of mucosa and the maximum equivalent strain/ stress in the oblique molar loading condition are about two times as the vertical molar loading condition. ese results suggested that both cushion-type and dome-type of the magnetic attachments are better choices in two-implant-retained mandibular overdentures, and oblique loading is more harmful than vertical loading
Summary
Previous studies using strain gauge analyses displayed lower lateral stress distribution for overdentures retained by cushion-type magnetic attachment than did the flat-type [11], while others showed similar effect on the denture movement and lateral stresses between the three types of magnetic attachments [3]. Based on these inconsistent results, it may be better to use other engineering tools to evaluate the biomechanical behaviors of the three magnetic attachment systems
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