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首页> 外文学位 >Fatigue testing of straight and angled abutments in a high torque dental implant system.
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Fatigue testing of straight and angled abutments in a high torque dental implant system.

机译：在高扭矩种植牙系统中对直基台和斜基台进行疲劳测试。

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摘要

Root form dental implants are a common solution used today to replace missing teeth. However current designs still suffer from a number of limitations. Angled abutments are used for incisors, where maximum human bite forces are normally 200 N. The aim of this study was to evaluate the mechanical performance of a novel dental implant system by fatigue testing straight and 15-degree angled abutments. It was hypothesized that the novel thread design will dissipate the load evenly throughout the implant allowing the system to withstand normal chewing forces. Implants with 4.2mm diameter were tested according to ISO 14801 in specimen holders tilted 30oand 25o, respectively, to illustrate worst case scenarios. Three straight and three angled abutment systems with screws torqued to 35 Ncm, were subjected to a load-to-failure test. This maximum load was decreased by 20% increments for cyclically loading implants at 2 Hz in air at room temperature until failure or run-out (2,000,000 cycles). Three implants were tested at each load to generate an S-N curve and endurance limit. Implant systems were then polished and etched to examine grain boundaries, determine the orientation of the original manufacturer cut and their potential effects on the mechanical properties of the implants' material (Ti alloy). Systems with straight abutments produced a mean load-to-failure of 603 N, an endurance limit of 121 N and a maximum bending moment of 665 Nmm. Systems with angled abutments yielded 487 N, 195 N and 906 Nmm, respectively. Microstructure studies showed a polycrystalline alpha structure with different grain orientations for the implant body and smaller alpha-beta structure for the abutment and screw. Cyclic loading was an initial study to evaluate the mechanical properties of the novel thread designed to provide sufficient area to dissipate the load evenly throughout the entire implant. The endurance limit of the angled abutment fell within the "safe" range, while the straight system showed a lower value. Surface treatment, diameter size and material enhancement through grain refinement may affect the strength of the implant construct.
机译：根状牙齿植入物是当今用于替代缺失牙齿的常见解决方案。然而，当前的设计仍然遭受许多限制。角基台用于切牙，其中最大的人类咬合力通常为200N。本研究的目的是通过对直角和15度角基台进行疲劳测试来评估新型牙种植体系统的机械性能。据推测，新颖的螺纹设计将在整个植入物上平均分散负载，使系统能够承受正常的咀嚼力。直径为4.2mm的植入物分别根据ISO 14801在倾斜30o和25o的样品架中进行了测试，以说明最坏的情况。对三个直的和三个角度的基台系统（其螺钉扭矩达到35 Ncm）进行了载荷-破坏测试。在室温下以2 Hz的频率将植入物在空气中循环加载时，最大载荷以20％的增量减小，直到失效或耗尽（2,000,000次循环）。在每个负载下测试了三个植入物，以生成S-N曲线和耐久极限。然后对植入物系统进行抛光和蚀刻以检查晶界，确定原始制造商切割的方向，以及它们对植入物材料（钛合金）的机械性能的潜在影响。具有直基台的系统产生的平均失效载荷为603 N，耐久性极限为121 N，最大弯矩为665 Nmm。具有倾斜基台的系统分别产生487 N，195 N和906 Nmm。微观结构研究表明，对于植入物主体，其晶粒取向具有不同的多晶α结构，对于基台和螺钉，其α-β结构较小。循环载荷是评估这种新型螺纹的机械性能的初步研究，该新型螺纹旨在提供足够的面积来均匀分散整个植入物的载荷。倾斜基台的承受极限落在“安全”范围内，而笔直系统显示出较低的值。表面处理，直径尺寸和通过晶粒细化的材料增强可能会影响植入物构造的强度。

著录项

  • 作者

    Atieh, Rana M.;

  • 作者单位

    The University of Alabama at Birmingham.;

  • 授予单位 The University of Alabama at Birmingham.;
  • 学科 Biophysics Biomechanics.
  • 学位 M.S.B.M.E.
  • 年度 2014
  • 页码 150 p.
  • 总页数 150
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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