Mini-implant loosening: 3D analysis using the finite element method.

Orthodontics : the art and practice of dentofacial enhancement Pub Date : 2012-01-01

Allahyar Geramy, Jean Marc Retrouvey, Reza Jelodar, Hasan Salehi

{"title":"Mini-implant loosening: 3D analysis using the finite element method.","authors":"Allahyar Geramy, Jean Marc Retrouvey, Reza Jelodar, Hasan Salehi","doi":"","DOIUrl":null,"url":null,"abstract":"Aim: Mini-implants are a relatively new device for absolute anchorage control in orthodontics. Their failure due to loosening is a multifactorial problem. Improper positioning of mini-implants with different diameters is evaluated in this study via the finite element method.Methods: Twelve 3D finite element models of a mandibular posterior segment were designed and included the first molar, a mini-implant, the periodontal ligament, and spongy and cortical bone. They were similar except for the mini-implant position and diameter (1.3, 1.6, and 2.2 mm). A vertical force of 300 N was applied to the occlusal molar surface. The von Mises stress and energy produced by the applied occlusal forces were assessed in the mini-implant and bone.Results: The stress findings were between 15.284 and 359.77 MPa for the mini-implants based on their diameters and locations. The mini-implant energy findings were between 0.00084 and 0.258 mJ. These ranges for bone stress and energy changes were 17.611 and 129.45 MPa and 0.296 and 1.575 mJ, respectively.Conclusion: A decrease in the distance between the mini-implant and tooth root has a direct effect on different parameters to explain mini-implant loosening.","PeriodicalId":89450,"journal":{"name":"Orthodontics : the art and practice of dentofacial enhancement","volume":"13 1","pages":"e51-7"},"PeriodicalIF":0.0000,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Orthodontics : the art and practice of dentofacial enhancement","FirstCategoryId":"1085","ListUrlMain":"","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

Aim: Mini-implants are a relatively new device for absolute anchorage control in orthodontics. Their failure due to loosening is a multifactorial problem. Improper positioning of mini-implants with different diameters is evaluated in this study via the finite element method.

Methods: Twelve 3D finite element models of a mandibular posterior segment were designed and included the first molar, a mini-implant, the periodontal ligament, and spongy and cortical bone. They were similar except for the mini-implant position and diameter (1.3, 1.6, and 2.2 mm). A vertical force of 300 N was applied to the occlusal molar surface. The von Mises stress and energy produced by the applied occlusal forces were assessed in the mini-implant and bone.

Results: The stress findings were between 15.284 and 359.77 MPa for the mini-implants based on their diameters and locations. The mini-implant energy findings were between 0.00084 and 0.258 mJ. These ranges for bone stress and energy changes were 17.611 and 129.45 MPa and 0.296 and 1.575 mJ, respectively.

Conclusion: A decrease in the distance between the mini-implant and tooth root has a direct effect on different parameters to explain mini-implant loosening.

本刊更多论文

微型种植体松动:三维有限元分析。

目的:微型种植体是一种相对较新的固定控制装置。它们因松动而失效是一个多因素问题。本研究通过有限元方法评估不同直径微型种植体的不正确定位。方法:设计了12个下颌后段三维有限元模型，包括第一磨牙、微型种植体、牙周韧带、海绵骨和皮质骨。除了微型种植体的位置和直径(1.3、1.6和2.2 mm)不同，它们是相似的。在咬合磨牙表面施加300牛的垂直力。在微型种植体和骨中评估了应用咬合力产生的von Mises应力和能量。结果:不同直径和位置的微型种植体的应力值在15.284 ~ 359.77 MPa之间。微型植入体能量值在0.00084 ~ 0.258 mJ之间。骨应力和能量变化范围分别为17.611和129.45 MPa和0.296和1.575 mJ。结论:微型种植体与牙根距离的减小对微型种植体松动的各参数有直接影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Orthodontics : the art and practice of dentofacial enhancement

自引率

0.00%

发文量