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Three-dimensional assessment of the effects of extraction on the smile in Class II high and low mandibular plane angle patients.

机译：三维评估拔牙对II类上​​下颌骨高位和低位患者微笑的影响。

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摘要

The annals of orthodontics are filled with studies aimed to understand how extraction orthodontic treatment might change the face. Although many studies have addressed profile changes due to extraction treatment, fewer studies have focused on how extractions change a patients smile. With the advent of surface imaging systems such as 3dMD, it is now possible to visualize the smile, and any changes incurred during orthodontic treatment, in three dimensions.;Subjects for this study were chosen from the pool of 11-18 year old patients treated at the Podray Orthodontic Clinic at the Temple University Kornberg School of Dentistry. Subjects were Cl II patients, and must have been treated with either extraction of any combination of premolars or treated without extraction. Subjects were divided into four experimental groups based on two characteristics- mandibular angle (those with angles greater than 28o versus those with angles less than 28o) and treatment (extraction versus non-extraction). The resulting groups were separated as follows: high-angle extraction patients (n=8), low-angle extraction patients (n=6), high-angle non-extraction patients (n=7), and low-angle non-extraction patients (n=15).;For each subject initial and final 3dMD images were superimposed using 3dMD Vultus software. A color histogram was constructed to visualize changes during treatment. The cheeks, commissures, upper and lower lips, chin, and nose, were also landmarked, and the changes in these landmarks were calculated. Volume changes were also calculated between pre and post treatment 3D data.;Results showed that the lower lip and right commissure changes between high-angle extraction and non-extraction groups were statistically significant. A qualitative analysis of the histograms further supported these findings. In general, a greater change in soft tissue landmarks and soft tissue volumes could be seen in high-angle patients than low-angle patients.;Differences in the changes that result from treatment type (extraction vs. non-extraction) were seen in the high-angle group. In contrast, similar changes result from treatment type (extraction vs. non-extraction) in the low-angle groups. Furthermore, the lip changes seen in extraction patients upon smiling are very similar to those changes seen in the same patient in repose. Most interestingly, soft tissue differences of the face due to treatment, growth, or both, seem to disappear upon smiling, with the exception of the lips. Qualitative assessment of these changes in the smile might be a more appropriate method for identifying soft tissue changes than statistical analyses. Similar studies with larger sample sizes are a promising direction for future research.
机译：正畸史上充斥着旨在了解拔牙正畸治疗如何改变面部的研究。尽管许多研究都针对由于拔牙治疗而引起的轮廓变化，但鲜有研究集中在拔牙如何改变患者笑容上。随着诸如3dMD之类的表面成像系统的出现，现在可以在三个维度上可视化微笑以及正畸治疗期间发生的任何变化。;本研究的受试者选自接受治疗的11-18岁患者在Temple University Kornberg牙科学院的Podray正畸诊所就读。受试者为C1 II患者，并且必须已经接受过前磨牙的任何组合的提取或未经提取的治疗。根据两个特征将受试者分为四个实验组：下颌角（下颌角大于28o，而下颌角小于28o）和治疗（拔牙与非拔牙）。将所得的组按以下方式分开：高角度拔除患者（n = 8），低角度拔除患者（n = 6），高角度非拔除患者（n = 7）和低角度非拔除患者患者（n = 15）。；对于每个受试者，使用3dMD Vultus软件叠加初始和最终3dMD图像。构造颜色直方图以可视化治疗期间的变化。脸颊，连指，上下嘴唇，下巴和鼻子也都具有标志性，并计算了这些标志性变化。还计算了治疗前后3D数据之间的体积变化。结果表明，高角度拔除组和非拔除组之间的下唇和右连合变化具有统计学意义。对直方图的定性分析进一步支持了这些发现。一般而言，高角度患者的软组织标志物和软组织体积变化要比低角度患者大;在治疗类型（拔牙与非拔牙）中观察到的变化差异很大。高角度组。相比之下，低角度组中的处理类型（提取与未提取）会导致类似的变化。此外，拔牙患者在微笑时看到的嘴唇变化与静止时同一患者中看到的变化非常相似。最有趣的是，由于治疗，生长或两者兼而有之，面部的软组织差异似乎在微笑时消失了，嘴唇除外。对这些微笑变化的定性评估可能是比统计分析更适合识别软组织变化的方法。具有更大样本量的类似研究是未来研究的有希望的方向。

著录项

  • 作者

    Uffner, Neil E.;

  • 作者单位

    Temple University.;

  • 授予单位 Temple University.;
  • 学科 Health Sciences Dentistry.
  • 学位 M.S.
  • 年度 2013
  • 页码 90 p.
  • 总页数 90
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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