Influence of implant number on the biomechanical behaviour of mandibular implant-retained/supported overdentures: A three-dimensional finite element analysis

被引:113
作者
Liu, Jingyin [1 ]
Pan, Shaoxia [1 ]
Dong, Jing [1 ]
Mo, Zhongjun [2 ]
Fan, Yubo [2 ]
Feng, Hailan [1 ]
机构
[1] Peking Univ Sch & Hosp Stomatol, Dept Prosthodont, Beijing 100081, Peoples R China
[2] Beijing Univ Aeronaut & Astronaut, Sch Biol Sci & Med Engn, Beijing 100081, Peoples R China
关键词
Dental implants; Mandibular overdenture; Locator attachment; 3D finite element analysis; Strain distribution; SINGLE-IMPLANT; STRESS-DISTRIBUTION; COMPLETE DENTURE; ANCHORAGE; TRIAL; LOAD;
D O I
10.1016/j.jdent.2012.11.008
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Objective: 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). Methods: 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: 100 N vertical and inclined loads on the left first molar and a 100 N vertical load on the lower incisors. The biomechanical behaviours of peri-implant bone, implants, abutments and overdentures were recorded. Results: 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. Conclusions and clinical significance: 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. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:241 / 249
页数:9
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