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Static and dynamic friction of self-ligating and non self-ligating brackets over time and different angles of bracket tip.

机译：自绑扎支架和非自绑扎支架在一段时间内以及支架尖端不同角度的静摩擦和动摩擦。

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摘要

Introduction. The method of ligation is one of the important factors influencing friction in orthodontics. Self-ligating brackets utilize a mechanical device built into the bracket to seat the wire in the slot, while conventional brackets utilize elastomerics or stainless steel ligatures tied around bracket wings to ensure the seating of the wire. They may be passive or active. The purpose of this study was to examine differences in static and dynamic friction resistance between different self-ligating and conventional bracket systems, over time and with different angles of bracket tip. Materials and methods. This study tested eight different groups of brackets. There were two groups of conventional brackets: Ovation R (GAC) ligated with elastomerics and Victory (3M Unitek) ligated with stainless steel ligatures. There were six groups of self-ligating brackets: Quick (Forestadent), SPEED (SPEED), In-Ovation (GAC), Damon 3 (Ormco), Smart Clip (3M Unitek) and Time 2 (American Orthodontics). Each group consisted of ten brackets paired with a 0.016" Sentalloy, straight archwire (GAC). Brackets were bonded to a hardware apparatus, using Prime & Bond NT (3M), which was attached to a Zwick Universal Testing Machine. Sentalloy wires were pulled individually at 1.58mm/sec through the bracket for a distance of 60mm. Each test yielded values for average coefficients of static and dynamic friction and average forces of static and dynamic friction. Each wire/bracket combination was tested at 0°, 2°, 4° and 6° of tip at the initial time of testing (0 weeks) and after 3 and 6 weeks of being immersed in water at 37° C. Results. Ovation brackets produced the highest threes of static and dynamic friction (p0.0001). Victory brackets produced the second highest frictional values (p0.0001). All self-ligating brackets produced lower frictional values than conventionally ligated brackets. When self-ligating brackets are compared to each other it was found that passive self ligating brackets. Damon 3 and Smart Clip, tended to produce lower static and dynamic frictional forces than active self-ligating brackets (p0.05). Conclusions. Conventionally ligated brackets are the least friction resistant brackets when compared to self-ligating systems. Passive self-ligating brackets tended to produce lower frictional forces than active self-ligating brackets. When friction is considered important in orthodontic treatment, the use of passive self-ligating brackets may offer advantages.
机译：介绍。结扎方法是影响牙齿矫正中摩擦的重要因素之一。自锁式支架利用内置于支架中的机械装置将电线固定在插槽中，而传统支架则利用绑在支架翼上的弹性体或不锈钢绑带来确保电线的固定。他们可能是被动的也可能是主动的。这项研究的目的是研究随着时间的推移以及不同的支架尖端角度，不同的自绑扎系统与常规支架系统之间在静，动摩擦阻力方面的差异。材料和方法。这项研究测试了八组不同的括号。有两组常规支架：用弹性体连接的Ovation R（GAC）和用不锈钢连接器连接的Victory（3M Unitek）。自结扎支架分为六组：快速（Forestadent），SPEED（SPEED），In-Ovation（GAC），Damon 3（Ormco），Smart Clip（3M Unitek）和Time 2（美国正畸）。每组由十个与0.016英寸Sentalloy直弓丝（GAC）配对的支架组成。使用Prime＆Bond NT（3M）将支架粘结到硬件设备上，并将其连接到Zwick通用测试机。将Sentalloy线拉出分别以1.58mm / sec的速度穿过支架60mm的距离，每次测试得出的静，动摩擦的平均系数以及静，动摩擦的平均力的值；每种金属丝/支架的组合在0°，2°，在测试的初始时间（0周）以及在37°C的水中浸泡3周和6周后，针尖的夹角为4°和6°。结果。排卵支架产生的静摩擦和动摩擦的三分之二最高（p <0.0001 ）。胜利支架产生的摩擦值第二高（p <0.0001）。所有自结扎支架的摩擦值均低于常规结扎支架。将自结扎支架相互比较时发现被动自结扎支架s。与主动自结扎支架相比，Damon 3和Smart Clip倾向于产生更低的静摩擦力和动摩擦力（p <0.05）。结论。与自结扎系统相比，常规结扎支架是最不耐摩擦的支架。被动式自结扎支架的摩擦力往往小于主动式自结扎支架。当在正畸治疗中认为摩擦很重要时，使用被动自锁托槽可能会带来好处。

著录项

  • 作者

    Lekic, Milos.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Health Sciences Dentistry.
  • 学位 M.Sc.
  • 年度 2007
  • 页码 159 p.
  • 总页数 159
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 口腔科学;
  • 关键词

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