fa Influence of implant number on the biomechanical behaviour of mandibular implant-retained/supported overdentures: A three-dimensional finite element analysis پروتزهای دندانی Prothtodontics پژوهشي Research <p> <strong>Objective</strong></p><p>  The aim of this study was to evaluate strain distribution in peri-implant bone, stress in the abutments and denture stability of mandibular overdentures anchored by different numbers of implants under different loading conditions, through three-dimensional finite element analysis (3D FEA). </p><p> <strong>Methods</strong></p><p>  Four 3D finite element models of mandibular overdentures were established, using between one and four Straumann implants with Locator attachments. Three types of load were applied to the overdenture in each model: 100N vertical and inclined loads on the left first molar and a 100N vertical load on the lower incisors. The biomechanical behaviours of peri-implant bone, implants, abutments and overdentures were recorded. </p><p> <strong>Results</strong></p><p>  Under vertical load on the lower incisors, the single-implant overdenture rotated over the implant from side to side, and no obvious increase of strain was found in peri-implant bone. Under the same loading conditions, the two-implant-retained overdenture showed more apparent rotation around the fulcrum line passing through the two implants, and the maximum equivalent stress in the abutments was higher than in the other models. In the three-implant-supported overdenture, no strain concentration was found in cortical bone around the middle implant under three loading conditions. </p><p> <strong>Conclusions</strong> <strong>and clinical significance</strong> </p><p> Single-implant-retained mandibular overdentures do not show damaging strain concentration in the bone around the only implant and may be a cost-effective treatment option for edentulous patients. A third implant can be placed between the original two when patients rehabilitated by two-implant overdentures report constant and obvious denture rotation around the fulcrum line. </p><p>  </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p> <a href="http://www.jodjournal.com/article/S0300-5712(12)00310-7/abstract" target="_blank"><font color="#0000ff">Full Text</font></a></p> Dental implants, Mandibular overdenture, Locator attachment, 3D finite element analysis, Strain distribution 0 0 http://idai.ir/browse.php?a_code=A-10-32-2119&slc_lang=fa&sid=1 Jingyin Liu 10031947532846009932 10031947532846009932 No Department of Prosthodontics, Peking University School and Hospital of Stomatology, No. 22 Zhongguancun Nandajie, Haidian District, Beijing 100081, People's Republic of China Shaoxia Pan 10031947532846009933 10031947532846009933 No Department of Prosthodontics, Peking University School and Hospital of Stomatology, No. 22 Zhongguancun Nandajie, Haidian District, Beijing 100081, People's Republic of China Jing Dong 10031947532846009934 10031947532846009934 No Department of Prosthodontics, Peking University School and Hospital of Stomatology, No. 22 Zhongguancun Nandajie, Haidian District, Beijing 100081, People's Republic of China Zhongjun Mo 10031947532846009935 10031947532846009935 No School of Biological Science and Medical Engineering, Beijing University of Aeronautics &Astronautics, XueYuan Road No. 37, Haidian District, Beijing 100081, People's Republic of China Yubo Fan 10031947532846009936 10031947532846009936 No School of Biological Science and Medical Engineering, Beijing University of Aeronautics &Astronautics, XueYuan Road No. 37, Haidian District, Beijing 100081, People's Republic of China Hailan Feng 10031947532846009937 10031947532846009937 Yes Department of Prosthodontics, Peking University School and Hospital of Stomatology, No. 22 Zhongguancun Nandajie, Haidian District, Beijing 100081, People's Republic of China