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Photoelastic stress analysis of mandibular canine distalization via different retraction methods.

机译：通过不同的回缩方法对下颌尖牙远侧进行光弹性应力分析。

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摘要

Objective: The purpose of this research is to evaluate the biomechanics of canine retraction for eight unique retraction methods via optical photoelastic stress analysis.;Rationale: Extraction of a first premolar is common in orthodontic treatment where there exists a mismatch in arch perimeter and tooth size/position. Clinically, this space is often closed via canine retraction, in a controlled manner and in a concise amount of time. Understanding differences in the force distributions along the canine root for various retraction modalities provides insight into the biomechanics of tooth movement and potentially guides an orthodontist considering retraction during treatment planning.;Method: A photoelastic mandibular dentition model is designed and fabricated using a urethane polymer material in an effort to simulate dentition post-leveling with no spacing, other than at the first premolar extraction site. Eight total retraction methods or groups are investigated, via two forms of anchorage; dental anchorage utilizing the second premolar and utilizing the first molar, as well as skeletal retraction utilizing a simulated temporary anchorage device (TAD). Within each anchorage method, elastomeric power chains (EPC) and nickel titanium (NiTi) coil springs are considered. Each retraction method is measured using three different retraction force values, 100 grams, 150 grams, and 200 grams, respectively. In collaboration with the teaching laboratory at the University of Rochester, Institute of Optics, Rochester, NY, an optical polariscope is constructed and aligned to measure, both qualitatively and quantitatively, the stress distribution within the mandible model for each retraction method.;Results: For dental anchorage retraction methods, as the amount of retraction force increases from 100 grams to 200 grams, stress increases in the apical mesial region, and the entire distal side of the canine root. For skeletal anchorage retraction methods, as the amount of retraction force increases from 100 grams to 200 grams, stress increases along the entire canine root. As the angle between the temporary anchorage device and the occlusal plane increases, so does the force on the apical distal region of the canine.;Conclusions: The use of dental anchorage provides a controlled tipping distal movement, whereas the use of skeletal anchorage provides an intrusion component to the stress along the canine root. When the extrinsic applied force is positioned from the distal wing of the canine to the mesial wing of the second premolar or to the molar hook, the resulting movement resembles controlled tipping. When the extrinsic applied force is positioned from canine hook to first molar hook, the resulting movement begins to resemble a translational movement. For skeletal anchorage, the increase of stress surrounding the entire canine root corresponds to the rotational force felt by the canine. As the angle between the temporary anchorage device and the occlusal plane increases, so does the amount of intrusion on the canine.
机译：目的：本研究的目的是通过光学光弹性应力分析来评估八种独特的牵开方法的犬牵开的生物力学。 /位置。临床上，该空间通常通过犬缩回以可控的方式和简洁的时间来封闭。了解各种回缩方式沿犬牙根的力分布的差异，可以深入了解牙齿运动的生物力学，并有可能指导正畸医生在治疗计划期间考虑回缩。试图模拟除第一磨牙前拔牙部位外无间隔的牙列后找平。通过两种锚固方式，研究了八种总回缩方法或组。利用第二前磨牙并利用第一磨牙进行牙齿锚固，以及利用模拟临时锚固装置（TAD）进行骨骼回缩。在每种锚固方法中，都考虑了弹性动力链（EPC）和镍钛（NiTi）螺旋弹簧。每种收缩方法都是使用三个不同的收缩力值分别测量的，分别为100克，150克和200克。与位于纽约州罗彻斯特的罗彻斯特大学光学研究所的教学实验室合作，构造并校准了光学偏光镜，以定性和定量地测量每种回缩方法在下颌模型中的应力分布。对于牙齿锚固回缩方法，当回缩力的大小从100克增加到200克时，顶内膜区域以及犬牙根的整个远端应力都会增加。对于骨骼锚固收缩方法，随着收缩力的大小从100克增加到200克，应力在整个犬齿根部增加。随着临时锚固装置和咬合面之间的角度增加，犬的根尖远侧区域上的作用力也随之增加。侵入犬齿根部应力的分量。当外加力从犬的远端翼到第二前磨牙的近中翼或磨牙钩定位时，所产生的运动类似于受控的倾翻。当外加力从犬齿钩定位到第一臼齿钩时，所产生的运动开始类似于平移运动。对于骨骼锚固，整个犬齿根周围的应力增加对应于犬齿感觉到的旋转力。随着临时锚固装置和咬合平面之间的角度增加，犬齿上的侵入量也增加。

著录项

  • 作者

    Altemose, Mindy L.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Dentistry.;Optics.
  • 学位 M.S.
  • 年度 2016
  • 页码 83 p.
  • 总页数 83
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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