3 D ANALYSIS OF ORTHODONTIC BIOMECHANICAL FORCE SYSTEMS

对生物力学力系统的透彻理解， 正畸弓丝激活对于产生有效的 牙齿移动，以达到预定的治疗目标。 这些信息对于准确解释 生物反应的矫正器。临床趋势是 更多地使用具有更大范围作用的电线 采用新材料建造，支架间跨度更长。这 使得正牙器具能够在更长的时间内保持活动， 预约之间的时间，但也放大了不必要的副作用， 不准确地构思的器具激活。因此必须 更准确地知道正畸钢丝产生的力和力矩 激活。 以前的研究已经检查了牙齿移动和力系统 从二维的角度来制作它。大多数正畸 然而，器具在所有空间平面中起作用。本研究旨在 更好地定义三维力和力矩， 三维矫正器。三维有限元 单元模型，提出了分析力系统的发展充分， 轮廓正畸弓丝。该研究将描述差异 在二维和三维力的分析之间， 由三维矩形正畸弓丝产生的力矩 插入臼齿和门牙重要的是考虑到 不同成分的正畸弓丝的不同性能 主要作用于弯曲和扭转， 被测导线的横截面尺寸，并比较 在臼齿和门牙处产生的有效力系统。的 并通过与理想牙弓的比较，研究牙弓形状对牙弓形态的影响 与那些更正方形或更锥形的形成配置。

Thorough understanding of the biomechanical force systems generated by orthodontic archwire activations is important for producing efficient tooth movement directed toward achieving predetermined treatment goals. This information is also essential for accurate interpretation of the biological responses to orthodontic appliances. Clinical trends are toward an increased use of wires with a greater range of action by appliances constructed of new materials and with longer interbracket spans. This enables an orthodontic appliance to remain active for longer periods of time between appointments but also magnifies the unwanted side-effects of inaccurately conceived appliance activations. It is therefore important to know more precisely the forces and moments produced by orthodontic wire activations. Previous studies have examined tooth movement and the force systems producing it from a two-dimensional perspective. Most orthodontic appliances, however, act in all planes of space. This study is aimed at better defining the three-dimensional forces and moments produced by three-dimensional orthodontic appliances. A three-dimensional finite element model is proposed to analyze the force systems developed by fully- contoured orthodontic archwires. The study will describe differences between a two-dimensional and three-dimensional analysis of the forces and moments produced by a three-dimensional, rectangular orthodontic archwire inserted at the molars and incisors. The importance of considering the different properties of various compositions of orthodontic archwires acting primarily in bending versus torsion will be examined by varying the cross-sectional dimensions of the wires being tested and comparing the effective force systems produced at the molars versus the incisors. The effect of dental arch shape will also be studied by comparing ideal arch form configurations with those that are more square or more tapered.