无牙颌
植入
材料科学
偏移量(计算机科学)
有限元法
压力(语言学)
口腔正畸科
极限抗拉强度
皮质骨
牙科
医学
复合材料
结构工程
计算机科学
工程类
外科
哲学
解剖
程序设计语言
语言学
作者
Kιvanç Akça,Haldun İplikçioǧlu
出处
期刊:PubMed
日期:2001-10-24
卷期号:16 (5): 722-30
被引量:111
摘要
Bending moments resulting from non-axial overloading of dental implants may cause stress concentrations exceeding the physiologic supporting capacity of cortical bone, leading to various kinds of failures. The aim of this study was to evaluate the effect of staggered (offset, tripodization) implant placement configuration and placement of wider-diameter implants in a straight-line configuration in mandibular posterior edentulism. A mandibular Kennedy Class II partially edentulous finite element model was constructed. Seven different partial fixed prostheses supported by 3 implants were designed according to 2 main configurations: straight-line or staggered implant placement. In 5 of the designs, implants with various diameters and length were placed along a straight line. In the other 2 models, offset placement of the middle implant buccally and lingually was simulated. A 400 N static load was applied perpendicular to the buccal inclination of the buccal cusps on each unit. Tensile and compressive stress values on cortical bone in the cervical region of the implants were evaluated. Lower stress values were recorded for the configuration with wider implants placed in a straight line. Other configurations, including staggered implant placement, produced similar stress values. Despite the offset implant placement, the stresses were not decreased; however, straight placement of wider implants may decrease bending moments.
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