Medical Implant Technology Group (MediTeg), Faculty of Biomedical Engineering & Health Sciences, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia.
J Dent. 2012 Jun;40(6):467-74. doi: 10.1016/j.jdent.2012.02.009. Epub 2012 Feb 23.
The aim of this study was to analyse micromotion and stress distribution at the connections of implants and four types of abutments: internal hexagonal, internal octagonal, internal conical and trilobe.
A three dimensional (3D) model of the left posterior mandible was reconstructed from medical datasets. Four dental implant systems were designed and analysed independently in a virtual simulation of a first molar replacement. Material properties, contact properties, physiological loading and boundary conditions were assigned to the 3D model. Statistical analysis was performed using one-way analysis of variance (ANOVA) with a 95% confidence interval and Tukey's Honestly Significant Difference (HSD) multiple comparison test.
The internal hexagonal and octagonal abutments produced similar patterns of micromotion and stress distribution due to their regular polygonal design. The internal conical abutment produced the highest magnitude of micromotion, whereas the trilobe connection showed the lowest magnitude of micromotion due to its polygonal profile.
Non-cylindrical abutments provided a stable locking mechanism that reduced micromotion, and therefore reduced the occurrence of microgaps. However, stress tends to concentrate at the vertices of abutments, which could lead to microfractures and subsequent microgap formation.
本研究旨在分析种植体与四种不同类型基台（内六角、内八角、内锥形和三叶形）连接点的微动和应力分布。
从医学数据集重建左侧下颌后牙的三维（3D）模型。在模拟第一磨牙置换的虚拟环境中，独立设计和分析了四种牙种植体系统。为 3D 模型分配了材料特性、接触特性、生理负荷和边界条件。使用具有 95%置信区间的单向方差分析（ANOVA）和 Tukey 的Honestly Significant Difference（HSD）多重比较检验进行统计分析。
由于内六角和八角基台的规则多边形设计，它们产生了相似的微动和应力分布模式。内锥形基台产生的微动幅度最大，而三叶形连接由于其多边形轮廓产生的微动幅度最小。
非圆柱形基台提供了稳定的锁定机制，减少了微动，从而减少了微间隙的发生。然而，应力往往集中在基台的顶点，这可能导致微裂缝和随后的微间隙形成。
